AuPt/3DOM CoCr2O4: Highly Active Catalysts for the Combustion of Methane

Authors

  • Xiyun Jiang Beijing University of Technology, Beijing 100124, China
  • Yuxi Liu, Jiguang Deng Beijing University of Technology, Beijing 100124, China
  • Xingtian Zhao Beijing University of Technology, Beijing 100124, China
  • Shan Sun Beijing University of Technology, Beijing 100124, China
  • Chengwei Zhai Beijing University of Technology, Beijing 100124, China
  • Fei Peng Beijing University of Technology, Beijing 100124, China
  • Hongxing Dai Beijing University of Technology, Beijing 100124, China

DOI:

https://doi.org/10.15377/2410-3624.2017.04.3

Keywords:

Three-dimensionally ordered macropore, spinel-type cobalt chromate, bimetallic gold-platinum nanoparticle, supported noble metal catalyst, methane combustion.

Abstract

 Three-dimensionally ordered macroporous (3DOM) CoCr2O4 and its supported bimetallic Auy Pt nanocatalysts (xAuyPt/3DOM CoCr2O4, x = 0.49, 0.98, and 1.92 wt%; Au/Pt molar ratio (y) = 0.99, 0.98, and 1.01) were prepared using the polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction methods, respectively. Physicochemical properties of the samples were characterized by means of various techniques. Catalytic activities of the xAuyPt/3DOM CoCr2O4 samples were evaluated for methane combustion. It is found that the 3DOM CoCr2O4 support possessed a single-phase and cubic spinel-type crystal structure, the xAuyPt/3DOM CoCr2O4 samples displayed a high-quality 3DOM architecture and a surface area of 32-33 m2/g, and the AuyPt nanoparticles (NPs) with a size of 3-5 nm were well dispersed on the 3DOM CoCr2O4 surface. The loading of an appropriate amount of AuyPt NPs could enhance the adsorbed oxygen species concentration and low-temperature reducibility of the sample. Among all of the samples, 0.98Au0.98Pt/3DOM CoCr2O4 showed the best catalytic performance: the T10%, T50%, and T90% (temperatures required for achieving methane conversion of 10, 50, and 90 %, respectively) were 253, 315, and 354 oC at a space velocity of 20,000 mL/(g h). It is concluded that the good activity of 0.98Au0.98Pt/3DOM CoCr2O4 was associated with its highly dispersed Au0.98Pt NPs, high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interaction between Au0.98Pt NPs and 3DOM CoCr2O4.

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Published

2017-12-21

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Xiyun Jiang, Yuxi Liu, Jiguang Deng, Xingtian Zhao, Shan Sun, Chengwei Zhai, Fei Peng, Hongxing Dai. AuPt/3DOM CoCr2O4: Highly Active Catalysts for the Combustion of Methane. Glob. Environ. Eng. [Internet]. 2017Dec.21 [cited 2021Sep.26];4(1):24-36. Available from: https://www.avantipublishers.com/jms/index.php/tgevnie/article/view/935

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