Hydrogenation is one of the oldest application methods applied in the laboratory and dates back to the 1900s. Heterogeneous catalytic hydrogenation (HCH) play a very important role in the synthesis of many organic molecules both in research laboratories and in industry. In this chapter, HCH reactions of organic compounds containing many different substituents such as alkenes, alkynes, carbonyl compounds, N-heterocycles and nitroarenes are comprehensively discussed. Additionally, the role of HCH in reductive amination reactions, which is another application of catalytic hydrogenation reactions, was demonstrated.
