Liu Hongyang and Peking University Martin, Institute of metals, Chinese Academy of Sciences, have made new progress in the hydrogenation of acetylene with nano carbon supported unit point Pd catalyst

In cooperation with Professor Martin of Peking University, the metal catalyst research group supported by nano carbon materials, which is composed of Liu Hongyang, associate researcher of Catalytic Materials Research Department of Institute of metals, Chinese Academy of Sciences and Huang Fei, Ph.D graduate student, has prepared atom level dispersed unit point PD on nano diamond / graphene carbon support by regulating the interaction between palladium (PD) atom and carbon support It is found that the catalyst plays an important role in the selective hydrogenation of acetylene Recently, J am Chem SOC Published the research results online (DOI: 10.1021 / JACS 8b07476), and the work was selected as the cover article Acetylene selective hydrogenation is one of the important reactions in the process of industrial production of polymer How to selectively hydrogenation acetylene to ethylene and avoid further hydrogenation of ethylene to ethane is the main problem to be solved in this reaction The supported Pd catalyst has high activity for acetylene hydrogenation, but low selectivity for ethylene At present, Pd based catalysts are widely used in industry, but there are still some problems in the utilization of Pd atom Therefore, it is of great significance to design and develop hydrogenation catalyst with high activity, high stability and economic utility The research team led by Liu Hongyang, an associate researcher, is dedicated to the research of metal catalysts supported on new carbon nano materials After years of academic accumulation, a kind of atom level dispersed and highly selective PD based catalyst for acetylene hydrogenation was prepared by using nano diamond / graphene composite core-shell material (nd @ g) as the support for the first time The atom level dispersion of PD on the carbon carrier and the electronic structure and chemical bonding in the local coordination environment were confirmed by means of spherical difference electron microscopy and X-ray absorption spectrum Considering the participation of hydrogen in the actual reaction system and the stability of the structure, they constructed a structural model of Pd atom and carbon carrier three coordinate bonding, and studied the hydrogenation mechanism of acetylene at this site The density functional theory (DFT) simulation results show that the catalyst with single atom PD active site is more favorable for the desorption of ethylene and further inhibition of ethylene hydrogenation This study provides a new idea for the development of a new type of highly efficient selective hydrogenation catalyst The above work has been supported by the general program of NSFC, the cultivation program of NSFC's "carbon based energy transformation" major research program, the "nano project" young scientists program of the key R & D program of the Ministry of science and technology, the youth Promotion Association of the Chinese Academy of Sciences, the Metal Institute of the Chinese Academy of Sciences and the Sinopec enterprise project, as well as the strong support provided by Shanghai synchrotron radiation light source.