Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (1): 92-105.DOI: 10.1016/S1872-2067(16)62567-6

• Article • Previous Articles     Next Articles

Catalytic performance enhancement by alloying Pd with Pt on ordered mesoporous manganese oxide for methane combustion

Peng Xu, Zhixing Wu, Jiguang Deng, Yuxi Liu, Shaohua Xie, Guangsheng Guo, 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, and Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engi-neering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2016-08-31 Revised:2016-09-25 Online:2017-01-18 Published:2017-01-18
  • Contact: Guangsheng Guo,Tel:+86-10-67396118;fax:+86-10-67391983;E-mail:guogs@bjut.edu.cn;Hongxing Dai,Tel:+86-10-67396118;fax:+86-10-67391983;E-mail:hxdai@bjut.edu.cn
  • Supported by:

    This work was supported by the Ph.D. Program Foundation of Ministry of Education of China (20131103110002); the NNSF of China (21377008), National High Technology Research and Development Program (863 Program, 2015AA034603), Foundation on the Creative Research Team Con-struction Promotion Project of Beijing Municipal Institutions, and Scientific Research Base Construction-Science and Technology Creation Plat-form-National Materials Research Base Construction.

Abstract:

Ordered mesoporous Mn2O3 (meso-Mn2O3) and meso-Mn2O3-supported Pd, Pt, and Pd-Pt alloy x(PdyPt)/meso-Mn2O3; x=(0.10-1.50) wt%; Pd/Pt molar ratio (y)=4.9-5.1 nanocatalysts were prepared using KIT-6-templated and poly(vinyl alcohol)-protected reduction methods, respectively. The meso-Mn2O3 had a high surface area, i.e., 106 m2/g, and a cubic crystal structure. Noble-metal nanoparticles (NPs) of size 2.1-2.8 nm were uniformly dispersed on the meso-Mn2O3 surfaces. Al-loying Pd with Pt enhanced the catalytic activity in methane combustion; 1.41(Pd5.1Pt)/meso-Mn2O3 gave the best performance; T10%, T50%, and T90% (the temperatures required for achieving methane conversions of 10%, 50%, and 90%) were 265, 345, and 425℃, respectively, at a space velocity of 20000 mL/(g·h). The effects of SO2, CO2, H2O, and NO on methane combustion over 1.41(Pd5.1Pt)/meso-Mn2O3 were also examined. We conclude that the good catalytic performance of 1.41(Pd5.1Pt)/meso-Mn2O3 is associated with its high-quality porous structure, high adsorbed oxy-gen species concentration, good low-temperature reducibility, and strong interactions between Pd-Pt alloy NPs and the meso-Mn2O3 support.

Key words: Ordered mesoporous manganese oxide, Pd-Pt alloy nanoparticle, Supported noble metal catalyst, Strong metal-support interaction, Methane combustion