Structural study of PdM/C and PtMe/C supported catalytic systems
V.V. Kriventsov 1), B.N. Novgorodov 1), D.P. Ivanov 1), D.G. Aksenov 1), D.A. Zyuzin 1), A.A. Vedyagin 1), N.S. Smirnova 2), D.A. Shlyapin2), V.Z. Radkevich 3), O.V. Arapova 4), A.V. Chistyakov 4), S.A. Nikolaev 5), M.V. Tsodikov 4)
1) Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia 2) Institute of Hydrocarbons Processing SB RAS, Omsk, Russia. 3) Institute of Physical Organic Chemistry NAS of Belarus, Minsk, Belarus. 4) Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russia 5) Lomonosov Moscow State University, Department of Chemistry, Moscow, Russia
In recent years, few new types of carbon supported catalysts, such as activated carbon fibers, Busofit and CNF carbon nanofibers-based catalysts, inspire a growing interest. As rule, Busofit and CNF based catalysts have improved catalytic selectivity, activity and thermostability as compared to the traditional carbon supported catalysts using carbon-black or Sibunit as supports. This modification of catalytic properties is believed to result from higher accessibility of the deposited active component to the reactants and from strong interactions between the catalyst particles and the support surface. This work is devoted to the comparative structural study of few promising Pd, Pd-M, Pt, Pt-M carbon-based catalytic systems using different carbon supports by the XAFS methods. All EXAFS spectra of the studied samples were recorded at Siberian Synchrotron and Terahertz Radiation Center (SSTRC, Novosibirsk). The local Pd, Pt and M (Zn, Ag, Ga, Fe, Cu, Co) arrangements of all the samples studied were established and the phase compositions were determined. It was shown that there are some differences of the metal arrangements for the studied systems. All possible structural models were discussed. In addition, these samples were studied by the TEM, EDX and X-ray diffraction methods. The data of all methods are in a good agreement. This work was conducted within the framework of the budget project #АААА-А17-117041710078-1 for Boreskov Institute of Catalysis. Vladimir Kriventsov thanks to the Russian Foundation for Basic Research for support of the analysis of the XANES data (projects No. 16-03-01139, 17-33-50198, 18-03-01251).