Precious metal catalysts are highly valued for their excellent activity, selectivity and stability, and are widely used in hydrogenation, dehydrogenation, oxidation, reduction, isomerization, aromatization, cracking, synthesis and other reactions. , petrochemical, pharmaceutical, environmental protection and new energy fields play a very important role.
The composition of homogeneous catalysts is relatively simple, usually a certain compound. The composition of supported catalysts for heterogeneous catalysis is complex, and usually consists of active metal components, cocatalysts and supports. A co-catalyst is a small amount of substance added to the catalyst, which is inactive or has little activity by itself, but can improve the performance of the catalyst. The carrier is a dispersant or support for the active component of the catalyst. The main function of the carrier is to increase the effective surface of the catalyst, provide a suitable pore structure, and ensure sufficient mechanical strength and thermal stability. Commonly used catalyst supports are Al2O3, SiO2, porous ceramics, activated carbon, etc.