Research in catalysis encompasses various areas such as homogeneous catalysis, heterogeneous catalysis, and enzyme catalysis. Homogeneous catalysis involves catalysts in the same phase as the reactants, usually in solution. Heterogeneous catalysis involves catalysts in a different phase, typically solid catalysts in contact with gaseous or liquid reactants. Enzyme catalysis, a subfield of biocatalysis, utilizes natural catalysts like proteins to accelerate biochemical reactions.