CRCU

Chemical Research in Chinese Universities ›› 1990, Vol. 6 ›› Issue (4): 346-353.

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XPS,Chemical Trapping, and DRFTIR Study on Mechanism of By-Products Formation in Selective (AMM)Oxidation of Propylene on MoO3 and γ-Bi2MoO6

Weng Weizheng, Yan Jiyang, Cai Junxiu, Dai Shenjun,Cao Shoujing, Chen Lingling, Wan Huilin   

  1. Department of Chemistry, Xiamen University, Ximen
  • Received:1990-10-04 Online:1990-12-24 Published:2011-09-09
  • Supported by:

    Supported by the National Natural Science Fundation of China.

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Abstract: XPSand chemical trapping experments with H2, NH3, and CH3Ias trapping agents were carried out for studying the adsorption of propylene over MoO3 or γ-Bi2MoO6. The results show that the fragmentation of carbon chain takes place during the adsorption of propylene through breaking C -Cdouble bond and C-Cbond on Mo2+ and the adjacent lattice oxygen, leading to formation of the oxygen- or nitrogen-containing by-products of C1 and C2 species. Diffuse-Reflection Fourier Transform Infrared (DRFTIR) Spectroscopy was used to study the surface species formed during the chemisorption and reaction of propylene over y-Bi2MoO6 at a lower temperature. The results that C1, C2 adspecies were detected by DRFTIRat 175℃ are consistent with the results of XPSand chemical trapping experiments, whlle the results at 50℃ Grasselli et al.

Key words: Selective (amm)oxidation of propylene, Mechanism of by-products formation, Chemical trapping, DRFTIR