A chemical additive that decreases the time of a chemical reaction with out being affected by the reaction.
a substance which speeds up a chemical reaction. The catalyst is unchanged at the end of the reaction.
A substance that effects a chemical reaction and/or the rate at which a chemical reaction takes place. In roofing, catalysts are used in SPF roofing.
A material which promotes the rate of a chemical reaction and which may be involved in the reaction itself. However, at the end of the reaction it is essentally unchanged.
Any substance of which a fractional percentage notably affects the rate of a chemical reaction without itself being consumed or undergoing a chemical change. Most catalysts accelerate reactions.
A substance that starts or speeds up a change or action.
A substance which accelerates a chemical reaction although not necessarily a part of that reaction.
A substance, usually present in small amounts, that influences the rate of a chemical reaction without being changed in the process.
a chemical substance that increases the speed of a chemical reaction without undergoing permanent change
Any material which speeds up a chemical reaction without taking part directly in the chemical changes involved.
A species that increases the rate of a reaction by providing an alternative (lower energy) pathway for the reaction to follow. It is only needed in very small concentration because it is regenerated after use (this is part of the definition of a catalyst).
substance which aids or promotes a chemical reaction without forming part of the final product. It enables the reaction to take place faster, remains unchanged at the end of the reaction and can provide control by increasing desirable reactions and decreasing undesirable reactions.
A catalyst changes the rate of a chemical reaction without being changed by the reaction itself. The periodic table
A substance that causes a chemical reaction to go faster, but is not itself changed during the reaction.
An agent which speeds up a reaction. A catalyst is not consumed in the reaction it catalyzes and so does not appear as a reactant or product in the balanced chemical equation.
A substance that increases the rate of a chemical reaction without actually undergoing any change itself.
A substance which markedly speeds up the cure of a compound by decomposing in the presence of a promoter to release an active oxygen radical. Catalyst content can vary from 0.2% to 2.0% with higher catalyst levels giving faster gel times. Examples are methyl ethyl ketone peroxide, benzoyl peroxide.
A substance responsible for an accelerated chemical reaction, which itself does not chemically change. calcine The heating of a substance, to a higher temperature, that is lower than its melting pint; resulting in loss of moisture, oxidation and the decomposition of carbonates.
A substance that retains its original chemical composition while bringing about a change in a substrate. Enzymes are catalysts in chemical reactions, and one enzyme can carry out hundreds or thousands of chemical transformations.
An agent that increases the rate of a chemical reaction, without being changed. For example chlorophyll acts as a catalyst in photosynthesis.
A substance which makes some chemical reaction happen faster, but is not itself consumed in the reaction.
A chemical compound that accelerates a chemical reaction. You can compare a catalyst with a marriage broker; in chemistry, a catalyst facilitates the marriage of (i.e. the reaction between) two chemicals.
Chemicals which are not consumed in a reaction, but, which speed up the reaction rate are called catalysts. Catalysts aid to form a transition state which is lower in energy than the transition state without the catalyst. Since the barrier to the reaction is lower, the reaction rate increases in the presence of catalysts.
A material which promotes some chemical action without itself entering into the reaction.
a substance that helps chemical reactions to occur but is not changed in the reaction
Chemically, an ingredient added to a product to provide additional performance characteristics, such as faster drying, chemical resistance, or increased hardness of the finish.
A substance that increases the rate of a chemical reaction without undergoing a permanent change in its structure. Enzymes are protein catalysts.
A substance that accelerates the rates of chemical reactions but is not itself permanently changed by the reaction.
Technically considered an initiator, catalyst is the colloquial name given to the substance added to the resin or gel coat to initiate the cure.
a substance that speeds the rate of a chemical reaction without being permanently altered in the reaction. Catalysts are effective in small quantities and are not used up in the reaction. All enzymes are catalysts; the human body has thousands of enzymes, each specific for a particular reaction.
A substance which promotes a chemical reaction, but does not itself enter into the reaction.
A Catalyst is a substance which assists a chemical reaction without taking part in it.
A substance that takes part in a chemical reaction and speeds it up, but itself undergoes no permanent chemical change.
A substance which aids or promotes a chemical reaction without forming part of the final product. It enables the reaction to take place faster or at a lower temperature, and remains unchanged at the end of the reaction.
A catalyst is a substance that accelerates a reaction without being consumed. The catalyst works by providing an alternate pathway (mechanism) for the reaction. The alternate pathway has a lower activation energy than the uncatalysed reaction. The catalyst can be thought of as a support on which two reactants are held in close proximity and in the correct orientation to react.
A chemical (metal) substance by which its mere presence accelerates, assists, retards or permits a chemical reaction but remains chemically unchanged in nature or amount at the end of the reaction.
Any component which accelerates a chemical reaction between two or more other components.
Substance that accelerates a chemical reaction without itself undergoing a change. Enzymes are protein catalysts.
A substance that reduces the activation energy of a reaction.
a substance that increases the rate of a chemical reaction without itself undergoing any change; somebody or something that makes a change happen or brings about an event.
Additives Substance generally used in small proportions, that changes the rateof a chemical reaction and itself remains chemically unchanged at the end of the reaction.
A substance that accelerates a specific chemical reaction but that is not altered by the reaction.
A substance which speeds up or slows down the rate of a chemical reaction without being used up itself.
a substance or combination of substances that speeds up a reaction without being permanently changed itself. (see heterogeneous catalyst, homogeneous catalyst)
Material added to resin to make it cure rapidly by oxidation with an accelerator as in polyester resins. This causes the heat which in turn cures the resin.
Substance which facilitates a chemical reaction.
A substance that causes or speeds a chemical reaction without itself being affected.
Substance that modifies (slows or more often quickens) a chemical reaction without being consumed in the reaction.
A substance serving as the agent in catalysis.
accelerator, curing agent
A chemical which promotes a chemical reaction without becoming part of the molecular structure of the product. In polymers, catalysts lower the temperature a which a reaction of a given rate can occur.
A hardener for resin adhesives. A reagent that accelerates a chemical reaction, with or without heat. In the case of resinous adhesives, it accelerates setting or hardening. Generally an acid, or isocyanate (initial stage of polyurethane).
a best described as a substance that brings about, or causes a reaction or occurrence without itself participating or being consumed
a chemical compound that acts to speed up a reaction, but in the process is not itself changed
a chemical compound that promotes a reaction without being consumed in the reaction
a chemical compound that takes part in a chemical reaction, and can often make the reaction proceed more quickly, but the chemical is not consumed in the chemical reaction
a chemical involved in, but not changed by, a biochemistry enzymes chemical reaction
a chemical, substance or compound that accelerates a chemical reaction
a chemical substance that changes the rates of chemical reactions without itself being used up in the process
a chemical that acts in the reaction and ends up there after the conversion has taken place
a chemical that causes a reaction between other chemicals without being affected itself
a chemical which allows a reaction to occur more quickly, without being involved in the reaction itself
a compound or element that can increase the rate of a chemical reaction
a compound that increases the rate of the reaction but does not affect the yield or equilibrium of the reaction
a compound which can alter the rate of a reaction without permently being altered by that reaction, and so can react over and over again
a material that has a pronounced effect on the speed of a chemical reaction without being affected or consumed by the reaction
a material that speeds up or otherwise facilitates a chemical reaction without undergoing a permanent chemical change itself
a material which speeds up a reaction without itself being used in the reaction
a molecule that speeds up a chemical reaction by lowering the activation energy required to start the reaction
a molecule that speeds up a reaction but is not consumed by that reaction
a molecule which can facilitate a chemical reaction without being consumed or changed
a molecule which increases the rate of a reaction but is not the
an agent that promotes, facilitates, or produces a certain chemical reaction without being part of the end result, without being consumed
an inorganic substance which hastens or retards a chemical reaction without necessarily undergoing a chemical change itself during the process
a substance capable of accelerating or decelerating a chemical reaction, without itself being changed in the process
A material which initiates and/or accelerates a chemical reaction but normally does not enter into the reaction.
Substance that speeds up a chemical process without actually changing the products of reaction
A finish additive that creates a chemical reaction in the coating which aids in quicker curing and promotes good durability and mar-resistant qualities.
a chemical which, under certain conditions, stimulates a chemical reaction (i.e. molecular change) in another compound without being consumed in the reaction.
A chemical agent added to casting resin to convert the resin from a liquid to a solid. (Catalyst is sometimes called ‘hardener’.)
Any substance that changes the rate of a reaction without itself being changed in the reaction; catalysts can be solids, liquids or gases, and they may be individual molecules that are dissolved in a liquid containing the reacting molecules. The most common industrial catalysts are solids used in treating feeds that are liquids or gases.
A material that causes an increase in the rate of a reaction due to its presence, but is unchanged at the end of the reaction. In EDM, catalyst refers to particulates of that aid in establishing a current path in the dielectric fluid.
A material which speeds up or stimulates a chemical reaction without being significantly chemically altered by the reaction.
A chemical which acts to speed up or facilitate a chemical reaction, but is not physically changed or used up in the reaction.
A substance which initiates or accelerates the speed of reaction between the other components of a coating formulation.
A compound that lowers the energy necessary to activate a chemical reaction, without being consumed or altered by it. Proteins are the primary catalysts in the cell, but RNA can act as a catalyst as well.
Additive for paint to speed the cure, give better recoatability, better durability to weather and provides gloss.
Any substance that is able to increases the rate of a chemical reaction, without being used up. Enzymes catalyze biological reactions but do not become involved in the reaction.
A substance that brings about a chemical reaction.
A substance which starts or speeds up a chemical reaction without being affected by that reaction.
A substance which has the capability of initiating or accelerating the speed of a reaction between two or more substances when mixed with them.
A substance which increases the rate of a chemical reaction, but itself remains unchanged at the end of the reaction.
Substance whose presence increases the rate of a chemical reaction, e.g., acid catalyst added to an epoxy resin system to accelerate drying time.
A catalyst is a substance that speeds a chemical reaction without taking part in the reaction itself.
A substance which alters (initiates or accelerates) the velocity of a reaction between two or more substances without changing itself in chemical composition.
a substance that modifies and increases the rate of a chemical reaction without being consumed in the process; catalysts play a part in the making of our finish material.
A substance used in small quantities to promote or control the curing of a compound without being consumed in the reaction.
A material that speeds up a chemical process without being consumed itself or otherwise changing.
Additive used to increase the rate of a chemical reaction. Not chemically consumed in the reaction (different from curing agent). Syn. Accelerator
A substance that initiates a chemical reaction and enables it to proceed under different conditions (as at a lower temperature or faster rate) than otherwise possible. The catalyst itself is not consumed, but continues to perform its function in subsequent reactions. Engelhard's environmental catalysts are used to initiate the breakdown of pollutants into their harmless elements, as when catalytic converters turn hydrocarbons, carbon monoxide and nitrogen oxides coming from cars into carbon dioxide, nitrogen and water vapor. Our petroleum catalysts transform crude oil molecules into gasoline and other fuel products. Customers in many different chemical-production processes use our chemical catalysts. The catalysts improve yield, cost-efficiency and environmental control.
a substance which speeds up a chemical reaction; it is not used up and can be used again and again
an ingredient in a coating of SPF which initiates a chemical reaction or increases the rate of a chemical reaction.
A substance, usu. present in small amounts relative to the reactants, that modifies and esp. increases the rate of a chemical reaction without being consumed in the process.
an agent that promotes or accelerates a chemical reaction without itself being consumed.
a substance thet lets a chemical reaction speed up at a faster rate or under slightly different conditions
A chemical agent that increases the rate of a reaction without being consumed by the reaction.
a compound that changes the rate of a chemical reaction without participating in the reaction. Catalysts usually speed a reaction up or allow it to take place at a lower temperature. They are extremely important in chemical and petrochemical processes and in environmental applications, such as cleaning up the exhaust from a car.
A substance that alters the rate of a chemical reaction but which is not used up during the reaction, and which is chemically unchanged at the end of it.
Substance whose presence increases the rate of a chemical reaction. In some cases, the catalyst functions by not being consumed and regenerated; in other cases the catalyst seems to not enter the reaction and functions by the virtue of surface characteristics of some kind. A negative catalyst (inhibitor, retarder) slows down a chemical reaction.
A substance which changes the rate of a chemical reaction without itself undergoing permanent change in its composition; a substance which markedly speeds up the cure of a compound when added in minor quantity compared to the amounts of primary reactants (hardener, initiator or curing agent).
a substance which alters the rate of a chemical reaction without being used up itself in the reaction.
a substance, which increases or decreases the speed of a chemical reaction and which remains unchanged after the chemical reaction
Something to speed up a chemical reaction without entering into the reaction. For example, a catalytic converter for automobile exhausts helps change carbon monoxide into carbon dioxide without becoming part of the reaction. Something that causes things to happen at a faster rate.
Substance that stimulates a particular reaction without itself being permanently changed in the process; enzymes are biological catalysts.
A chemical that changes the rate of reaction of a chemical process, but is not consumed or produced during the reaction. (Catalysts are required for foam production to balance rates of competing reactions and to attain desired physical properties.)
normally a chemical which affects the rate of a chemical reaction without itself being used up in the reaction; for vulcanization by peroxides, the peroxide is often referred to as “catalyst” even though it does break down completely during the reaction
adj. substance that initiates a reaction and enables it to take place under milder conditions
An agent (such as an enzyme or a metallic complex) that facilitates a reaction, but is not itself changed during the reaction.
A substance, usually added in small amounts, which precipitates the curing process of an elastomer. Synonymous with activator, curing agent.
A chemical that speeds up the rate of a reaction, without being used up in the process.
A substance which speeds up a reaction when added to another substance.
A substance that initiates a chemical reaction under different conditions (such as lower temperatures) than would otherwise be possible. The catalyst itself remains unchanged at the end of the reaction.
a substance that speeds up a reaction without being consumed.
a substance which is not consumed in a reaction, but can increase the rate of the reaction. It does so by providing an alternative reaction mechanism which involves a lower activation energy. Catalysts do not alter equilibrium positions of reactions but they can greatly reduce the time taken to achieve equilibrium.
A special chemical that promotes or accelerates the curing reaction or reduces stoving temperature.
a substance which increases the rate of a chemical reaction, without being consumed or produced by the reaction. Sodium Hydroxide and Potassium Hydroxide are catalysts for the production of biodiesel.
A chemical that speeds up or slows down chemical reactions.
A substance which facillitates or allows a chemical reaction to occur but which is not consumed in the reaction.
An element or compound that accelerates the rate of a chemical reaction but is neither changed nor consumed by it.
A substance that promotes or controls curing of a compound without being consumed in the reaction.
Something which, when added to something else, creates a reaction which neither of the two things could have created on their own. In business, management consultants are often said to be catalysts, enabling firms by their mere presence to take action that they would not otherwise have done.
A chemical substance that increases the rate of a reaction without being consumed, after the reaction it can potentially be recovered from the reaction mixture chemically unchanged. The catalyst lowers the activation energy required, allowing the reaction to proceed more quickly or at a lower temperature. In the context of fuel cells: a material that facilitates the reaction of oxygen and hydrogen without being affected itself. It is usually made of platinum powder very thinly coated onto carbon paper or cloth. The catalyst is rough and porous so that the maximum surface area of the platinum can be exposed to the hydrogen or oxygen. The platinum-coated side of the catalyst faces the membrane in the fuel cell.
A substance that accelerates a chemical change.
a substance, usually used in small amounts relevant to the reactants that modifies and increases the rate of a reaction without being consumed in the process.
(also see Accelerator): A substance which causes or speeds a chemical reaction. Usually part B of a two-part adhesive.
A substance (usually a peroxide) which readily forms free-radicals. These free radicals react with polymer and monomer molecules to speed up the curing of thermoset resins. Catalyst content can vary from 0.2% to 2.0% with higher catalyst levels giving faster cure times. Examples are methyl ethyl ketone peroxide and benzoyl peroxide.
An accelerator, activator or agent which chemically increases the rate of reaction in a coating.
A chemical species or other structure that facilitates a chemical reaction without itself undergoing a permanent change. http://www.nano.org.uk/vocab_terms.htm
A substance that changes the rate at which a reaction equilibrium is attained, without itself being consumed. Catalysts can increase the rate of reaction (positive catalysts) or decrease them (negative catalysts or inhibitors).
A substance that causes or changes the rate of a chemical reaction.
A substance which provokes a chemical reaction in other materials without itself changing. For example, an egg will emulsify water and oil by acting as a catalyst. In resin sculpture, a catalyst must be added in order to cause the resin to harden. An accelerator, usually already added to the resin, reacts with the catalyst and heat is generated which sets off the hardening process.
A substance that speeds up a chemical or biochemical reaction that would have occurred naturally (without help), but at a much slower rate; enzymes are biological catalysts.
A substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions than otherwise possible.
a substance that speeds up a chemical reaction but itself is unchanged
A substance that speeds up a chemical reaction without participating in it. Catalysts, of which enzymes are a good example, thus are not consumed in the reaction.
A substance that can increase or decrease the rate of a chemical reaction between substances without being physically consumed in the process. A catalyst, which reduces engine emissions, is used in a catalytic converter.
A chemical substance employed to speed up the cure of adhesives, sealants, potting/encapsulation compounds and impregnants; see also "accelerator"; frequently used as the "B" component of a two-part thermosetting adhesive; sealant or potting compound.
a substance that speeds up a chemical reaction without being altered chemically itself
a chemical compound (usually an organic peroxide) which initiates polymerisation of a resin
A substance that lowers the amount of energy required for a chemical reaction to occur. In practise a catalyst speeds up the rate of a reaction. An automotive catalyst comprises a high specific surface area substrate, typically ceramic or metal, onto which an active (catalytic) w ash- coat is added. The w ash-coat is designed to further increase the specific surface area and make as much of the active material as possible available to the exhaust gas to increase the reaction rate.
Substance that causes or speeds up a chemical reaction when it is mixed with another substance and that does not change by itself.
A chemical agent used in rather small amounts as an additive to accelerate or activate a chemical reaction.
A catalyst is a substance which increases the rate of a reaction without being consumed itself. In a fuel cell, there will typically be a catalyst used for the electrodes (to break down hydrogen into electrons and protons). Catalysts are also often used in reforming fuel.
a chemical that accelerates chemical reaction: a substance that increases the rate of a chemical reaction without itself undergoing any change.
a substance that, when added to a reaction mixture, changes (speeds up) the rate of attainment of equilibrum in the system without itself undergoing a permanent chemical change.
A substance that increases the yield of a chemical reaction without becoming part of the reaction product.
Substance added in small quantities to promote a reaction, while remaining unchanged itself.
A catalyst changes the rate of a chemical reaction without being changed by the reaction itself. Useful products from air
A chemical used to change the rate of a chemical reaction. Differs from a curing agent/hardener in that the catalyst is not itself chemically consumed in the reaction while a curing agent is.
A catalyst is substance which increases the rate of a chemical reaction without itself being used up in the reaction.
Any substance that initiates a change or reaction in other substances without altering its own state is known as a catalyst.
A substance used to change the rate of a chemical reaction without itself undergoing permanent change in composition.
A substance that changes the rate of a chemical reaction without itself undergoing permanent change in composition or becoming a part of the molecular structure of the product. A substance than markedly speeds up the cure of a compound when added to minor quantity as compared to the amounts of primary reactants. Solvents and Reducers
substance which accelerates the reactions of chemicals without being consumed itself.
A substance that alters the speed of a chemical reaction and does not appear in the final product and undergoes no permanent changes. search
A substance which causes or aids chemical change in other substances without undergoing a change itself.
A substance that changes the rate of a chemical reaction when it is mixed with another substance and that does not change or react itself. A catalyst differs from a curing agent in that the catalyst is not itself chemically consumed in the reaction while curing agent is consumed.
a substance that modifies, especially increases, the rate of chemical reaction without being consumed or changed in the process.
a catalyst is a material that facilitates, accelerates etc. a chemical reaction retaining its own properties and without being consumed.
A chemical compound that promotes the reaction among other compounds without undergoing chemical change or being expended in the process.
A substance which speeds up the polymerization or cure of a compound when added in minor quantity as compared to the primary reactants.
catalyst is a substance that changes the rate of a reaction, but does not get involved in the reaction. IF YOU CAME HERE FROM A DIFFERENT PAGE, CLICK ON THE BACK BUTTON TO GO BACK TO THE PAGE YOU WERE VIEWING.
a chemical which acts to stimulate a particular chemical reaction, usually without itself being permanently chemically changed in the process. Enzymes are a dorm of biological catalyst. Iron and copper are powerful free radical autoxidation catalysts. The products of free radical autoxidation: hence the process is called autocatalytic. The spontaneous combustion of oil-based paint-soaked rags is autoctalytic autoxidation.
A material which accelerates a chemical reaction without becoming part of the reaction products.
An ingredient that speeds up a chemical reaction; sometimes used in two-component paint systems.
Substance that, by its presence, modifies the speed of a chemical reaction without changing in the process.
A substance whose presence changes the rate of chemical reaction without itself undergoing permanent change in its composition. Catalysts may be accelerators or retarders. Most inorganic catalysts are powdered metals and metal oxides, chiefly used in the petroleum, vehicle and heavy chemical industries.
substances which speed up reactions but which do not get used up themselves
A substance that speeds up a chemical reaction without being destroyed by that reaction. A real important concept in biology because without organic catalysts called enzymes, life could not exist at the temperatures that it does.
A substance, usually present in small amounts compared to the reactants, that speeds up the chemical reaction rate without being consumed in the process.
A substance which, when present in a very small amount, increases the rate at which two or more chemicals react together.
A material that alters the pace of a chemical reaction pace so that it does not undergo any permanent changes in its own structure. This term also refers to a substance that significantly increases the curing of a compound when introduced in small amounts, contrasted with the quantity of primary reactants.
a substance which increases the rate of a chemical reaction without being consumed or produced by the reaction. Catalysts speed both the forward and reverse reactions, without changing the position of equilibrium. Enzymes are catalysts for many biochemical reactions.
A substance which influences the rate of a chemical reaction but is not one of the original reactants or final products, i.e. it is not consumed or altered in the reaction. Catalysts are used in many processes in the chemical and petroleum industries. Emission control catalysts are used to promote reactions that change exhaust pollutants from internal combustion engines into harmless substances.
a substance which without itself undergoing any permanent chemical change, facilitates or enables a reaction between other substances.
A substance that influences a chemical action in which it does not take part.
A substance which markedly speeds up the cure of an adhesive when added in minor quantity as compared to the amounts of the primary reactants.
A substance that accelerates the rate of a chemical reaction.
A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.
A material that alters the energy necessary to produce a chemical reaction. If the energy is lowered, the reaction proceeds more quickly (the typical use for a catalyst). If the energy necessary is increased, the reaction is slowed. The catalyst is not consumed by the chemical reaction.
A compound which increases the rate of a reaction, although it does not itself undergo any net chemical change. Enzymes are biological catalysts.
Additive that initiates a chemical reaction.
Any substance which, by virtue of its presence, affects the rate of a chemical reaction and which may be recovered practically unchanged at the end of the reaction.
A substance which has the capability of initiating or accelerating the speed of a reaction between two or more substances when introduced into their presence, normally in small quantities. It remains chemically unchanged at the end of the reaction.
Substance whose presence increases the rate of a chemical reaction. In thermosets, the catalyst promotes and/or controls the curing (crosslinking or hardening). They are also called Accelerators. In rubbers, catalysts are used to accelerate vulcanization. They are also called Vulcanization accelerators. In thermosplastics, catalysts are used for polymerization (see Ziegler-Natta) and can be used to accelerate the degradation of some polymers. See Hardener, Curing Agent
Any chemical compound that speeds up the rate of a chemical reaction.