Brief introduction of catalysts

A catalyst is a kind of chemicals that participates in multiple chemical transformations, may be inhibited, deactivated or destroyed by secondary processes, but not consumed by the reaction itself.
Types of catalysts can be summarized as the following fore: heterogeneous catalysts, homogeneous catalysts, electro catalysts and organ catalysts. Whether it is heterogeneous or homogeneous depends on whether a catalyst exists in the same phase as the substrate. Biocatalysts are often seen as a separate group.