In chemistry a catalyst is a substance which, when added to other substances, allows them to change while itself remaining unchanged.
a catalyst is a substance added to a chemical reaction to speed it up without changing the outcome. an inhibitor, however, slows down a chemical reaction.
To promote or speed a chemical reaction without reaction with the reactants.
There are different catalysts, it depends on the chemical reaction. There is no one powder called catalyst.
a catalyst is a chemical used to speed up a reaction without being 'used up'
A biological catalyst is an enzyme, enzyme are found all over living things, each with specific use
In a regular fireplace you burn the fuel, wood, coal, gas or propane, and the byproducts of combustion go up the chimney or out the venting. In a catayltic fireplace those by products go into a catayst that burns at a much higher temperature so it further cumbusts much of the bi-product. The result is increased efficiency and less pollutants and combustion by-products.