East China University of science has made a breakthrough in the preparation of noble metal catalysts for high temperature stability - Richest Group

East China College of Chemistry Science University associate professor Zhan Wangcheng as the first person to complete, in cooperation with the Oak Ridge National Laboratory Upupa epops Professor, recently in the high temperature stability of noble metal catalysts has made breakthrough progress.

Supported noble metal catalysts in CO and hydrocarbon oxidation, water gas conversion, catalytic activity has very prominent selective hydrogenation of many chemical reactions, so this catalyst has been a hot research topic in the field of catalysis. Many research results show that the noble metal catalyst activity, selectivity and stability and catalytic properties of noble metal nanoparticles the particle size is closely related to the particle size greater than 6nm when the noble metal catalyst activity decreased sharply. However, due to the low tammann temperature and high surface energy, noble metal nanoparticles treated in the process of sintering phenomenon will heat into large particles to reduce the surface energy, the ultimate guide The performance degradation caused by noble metal catalysts have been reported in literature. The methods of improving the technology and the thermal stability of noble metal nanoparticles, including pore confinement, embedding, alloy effect and carrier pretreatment. Although these methods can improve the thermal stability of precious metal in different degrees of nanoparticles, but also there are some defects, such as embedding method in improving the thermal stability of noble metal nanoparticles also covered the catalyst, and greatly increases the diffusion resistance of reactants and products.
Shanghai Ruizheng engaged in foreign trade chemical industry for many years, aims to become the leader of China's chemical foreign trade Shanghai Ruizheng has been working in this area