Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (2): 207-216.DOI: 10.1016/S1872-2067(16)62569-X

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Catalytic performance of cobalt oxide-supported gold-palladium nanocatalysts for the removal of toluene and o-xylene

Zhiwei Wanga, Yuxi Liua, Tao Yangb, Jiguang Denga, Shaohua Xiea, Hongxing Daia   

  1. a Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, and Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;
    b Mechanical Engineering Department, University of Aveiro, 3810-193 Aveiro, Portugal
  • Received:2016-09-17 Revised:2016-10-27 Online:2017-02-18 Published:2017-03-14
  • Contact: 10.1016/S1872-2067(16)62569-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21377008, 21477005, U1507108), National High Technology Research and Development Program of China (2015AA034603), Beijing Nova Program (Z141109001814106), and Natural Science Foundation of Beijing Municipal Commission of Education (KM201410005008).

Abstract:

Using the molten salt and polyvinyl alcohol-protected reduction method, we fabricated Co3O4 octahedron-supported Au-Pd (x(AuPdy)/Co3O4; x=(0.18, 0.47, and 0.96) wt%; y (Pd/Au molar ratio)=1.85-1.97) nanocatalysts. The molten salt-derived Co3O4 sample possessed well-defined octahedral morphology, with an edge length of 300 nm. The Au-Pd nanoparticles, with sizes of 2.7-3.2 nm, were uniformly dispersed on the surface of Co3O4. The 0.96(AuPd1.92)/Co3O4 sample showed the highest catalytic activity for toluene and o-xylene oxidation, and the temperature required for achieving 90% conversion of toluene and o-xylene was 180 and 187℃, respectively, at a space velocity of 40000 mL/(g·h). The high catalytic performance of Co3O4 octahedron-supported Au-Pd nanocatalysts was associated with the interaction between Au-Pd nanoparticles and Co3O4 and high concentration of adsorbed oxygen species.

Key words: Molten salt, Cobalt oxide, Au-Pd nanoparticle, Volatile organic compound, Catalytic oxidation