Why most metals used in catalysis are transition metals has to be explained.
Catalyst: A substance or a compound which promotes the rate of a chemical reaction is said to be catalyst. Catalysts are classified into two types. They are homogeneous catalysts and heterogeneous catalysts.
Homogeneous catalysis: In a chemical catalysis reaction solution by a soluble catalyst is said to be homogeneous catalysis.
Heterogeneous catalysis: In a chemical catalysis reaction, the phases of reactant and catalyst are different.
Transition metals: The elements which are come under d-block in periodic table is said to be transition metals.