Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (3): 602-610.doi: 10.3866/PKU.WHXB201611251

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Catalytic Performance and Characterization of Anatase TiO2 Supported Pd Catalysts for the Selective Hydrogenation of Acetylene

Xiao-Ping GAO1,2,Zhang-Long GUO1,2,Ya-Nan ZHOU1,2,Fang-Li JING1,Wei CHU1,2,*()   

  1. 1 School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
    2 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, P. R. China
  • Received:2016-08-26 Published:2017-03-07
  • Contact: Wei CHU E-mail:chuwei1965@scu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21476145)

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Abstract:

Anatase TiO2 nanospindles containing 89% exposed {101} facets (TiO2-101) and nanosheets with 77% exposed {001} facets (TiO2-001) were hydrothermally synthesized and used as supports for Pd catalysts. The effects of the TiO2 materials on the catalytic performance of Pd/TiO2-101 and Pd/TiO2-001 catalysts were investigated in the selective hydrogenation of acetylene to polymer-grade ethylene. The Pd/TiO2-101 catalyst exhibited enhanced performance in terms of acetylene conversion and ethylene yield. To understand these effects, the catalysts were characterized by H2 temperature-programmed desorption (H2-TPD), H2 temperatureprogrammed reduction (H2-TPR), transmission electron microscopy (TEM), pulse CO chemisorption, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The TEM and CO chemisorption results confirmed that Pd nanoparticles (NPs) on the TiO2-101 support had a smaller average particle size (1.53 nm) and a higher dispersion (15.95%) than those on the TiO2-001 support (average particle size of 4.36 nm and dispersion of 9.06%). The smaller particle size and higher dispersion of Pd on the Pd/TiO2-101 catalyst provided more reaction active sites, which contributed to the improved catalytic activity of this supported catalyst.

Key words: Pd/TiO2 catalyst, Acetylene selective hydrogenation, Anatase TiO2, {101}plane, Structure characterization

MSC2000: 

  • O643