In my last post, I have discussed about the general catalysis phenomena, and its most basic types. But the homogeneous and heterogeneous catalysis are not the only types of the catalysis. The chemical engineer also classifies catalysis on the basis of the nature of species responsible for the catalytic activity. These types are mostly inter-related with other types of the same nature. E.g. molecular catalysts can be used as homogeneous, as well as heterogeneous catalysts, Surface catalysts are heterogeneous catalysts etc. Some of the types are:
1) Molecular Catalysis:
This term is used for the systems, where identical molecular species are the catalytic entity. Many of these catalysts are used as homogeneous catalysts, but these can also be used in heterogeneous (multi-phase) catalysis.
2) Surface Catalysis:
Surface catalysis takes place on the surface atoms of the extended solid. It depends on the different properties of the surface atoms, and different types of the molecular sites. Surface catalysts are solid, so these are heterogeneous catalysts by nature.
3) Enzyme Catalysis:
Enzymes are proteins, polymers of amino acids, so this type of catalysis is used to catalyze reactions in living organism, biological and biochemical reactions. The enzyme catalysis is usually molecular catalysis.
4) Auto Catalysis:
In autocatalysis, there is no need to use a separate catalysis, but in a reaction one of the products acts as a catalyst it self. Some biochemical reactions are experimentally observed as the auto catalysis reactions.
1) Molecular Catalysis:
This term is used for the systems, where identical molecular species are the catalytic entity. Many of these catalysts are used as homogeneous catalysts, but these can also be used in heterogeneous (multi-phase) catalysis.
2) Surface Catalysis:
Surface catalysis takes place on the surface atoms of the extended solid. It depends on the different properties of the surface atoms, and different types of the molecular sites. Surface catalysts are solid, so these are heterogeneous catalysts by nature.
3) Enzyme Catalysis:
Enzymes are proteins, polymers of amino acids, so this type of catalysis is used to catalyze reactions in living organism, biological and biochemical reactions. The enzyme catalysis is usually molecular catalysis.
4) Auto Catalysis:
In autocatalysis, there is no need to use a separate catalysis, but in a reaction one of the products acts as a catalyst it self. Some biochemical reactions are experimentally observed as the auto catalysis reactions.
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