A process by which a chemical reaction is accelerated in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is apparenty left unchanged; as, the catalysis of making ether from alcohol by means of sulphuric acid; or catalysis in the action of enzymes (as diastase, or ptyalin) on starch.
The catalytic force.
A process can sometimes be improved by using a catalyst. In principle, this catalyst will do the job and can be recovered at the end of the reaction so it can be reused.
A situation where a non-involved compound speeds up a reaction.
A process in which the presence of a specific situation, thing or person acts as an 'exciting element', initiating transformative change while not itself changing.
The chemical or biological process whereby the presence and/or participation of an external catalyst molecule (i.e., enzyme), causes a chemical reaction to occur or to improve reaction performance without ultimately altering the catalyst molecule.
process involving a substance, or catalyst, capable of accelerating a chemical reaction without being modified, or just temporarily
The speeding up or, sometimes, slowing down of a chemical reaction by adding a substance which itself is not changed or consumed in the process: therefore, the catalyst is returned, unchanged from the reaction; note that the liberation of the catalyst may not be apparent, as it may evaporate during the reaction (e.g., curing or kicking) process. Factors such as temperature, pressure, and humidity will affect the reaction time.
The process whereby a substance (catalyst) facilitates a chemical reaction without itself being consumed in the process. ~ See Also: Enzyme, Ribozyme.
acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
acceleration of a chemical reaction by catalysts
A reaction taking place due to the presence of an enabling agent, one that is not changed in the process. An essential part of autocatalytic processes.
The increase in rate of a reaction due to the presence of a substance that undergoes no net change during the reaction.
A chemical reaction involving a material which promotes or increases the rate of the reaction without itself undergoing any permanent chemical change.
kat-AL-i-sis Speeding a chemical reaction. 49
A process in which a catalyst increases the speed of a chemical reaction.
the process by which catalysts function.
The process of changing the rate of a chemical reaction by the action of a catalyst.
The quickened rate of a chemical reaction due to a catalytic agent. Catalysts are often applied to substrates to speed up the finishing procedure.
(n) A reaction in which a catalyst participates
the acceleration (or retardation) of the speed of a chemical reaction by the presence of a comparatively small amount of a foreign substance called a catalyst.
A phenomenon in which a relatively small amount of substance (catalyst) augments the rate of a chemical reaction without itself being consumed.
In chemistry and biology, catalysis is the acceleration (increase in rate) or slowing down of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction. The word is derived from the Greek noun ÎºÎ±Ï„Î¬Î»Ï…ÏƒÎ¹Ï‚, related to the verb ÎºÎ±Ï„Î±Î»ÏÎµÎ¹Î½, meaning to annul or to untie or to pick up.