Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (6): 837-848.DOI: 10.1016/S1872-2067(18)63205-X

• Special Column on the 11th National Conference on Environmental Catalysis and Eco-Materia • Previous Articles     Next Articles

AgAuPd/meso-Co3O4:High-performance catalysts for methanol oxidation

Jun Yang, Yuxi Liu, Jiguang Deng, Xingtian Zhao, Kunfeng Zhang, Zhuo Han, Hongxing Dai   

  1. Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, 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
  • Received:2018-10-27 Revised:2018-11-26 Online:2019-06-18 Published:2019-04-26
  • Contact: 10.1016/S1872-2067(18)63205-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21677004, 21876006, and 21622701) and the National High Technology Research and Development Program of China (863 Program, 2015AA034603).

Abstract:

The meso-Co3O4 and AgxAuyPd/meso-Co3O4 catalysts were prepared using the KIT-6-templating and polyvinyl alcohol-protected NaBH4 reduction methods, respectively. Various techniques were used to characterize physicochemical properties of these materials. Catalytic performance of the samples was evaluated for methanol combustion. The cubically crystallized Co3O4 support displayed a three-dimensionally ordered mesoporous structure. The supported noble metal nanoparticles (NPs) possessed a surface area of 115-125 m2/g, with the noble NPs (average size=2.8-4.5 nm) being uniformly dispersed on the surface of meso-Co3O4. Among all of the samples, 0.68 wt% Ag0.75Au1.14Pd/meso-Co3O4 showed the highest catalytic activity (T50%=100℃ and T90% =112℃ at a space velocity of 80000 mL (g-1 h-1). The partial deactivation of the 0.68 wt% Ag0.75Au1.14Pd/meso-Co3O4 sample due to water vapor or carbon dioxide introduction was reversible. It is concluded that the good catalytic performance of 0.68 wt% Ag0.75Au1.14Pd/meso-Co3O4 was associated with its highly dispersed Ag0.75Au1.14Pd alloy NPs, high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interaction between Ag0.75Au1.14Pd alloy NPs and meso-Co3O4.

Key words: Volatile organic compound, Mesoporous cobalt oxide, Supported noble metal catalyst, AgAuPd alloy nanoparticle, Methanol oxidation