Volume 8 Issue 2
Mar.  2018
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Article Navigation >  Journal of Environmental Engineering Technology  > 2018  >  8(2): 142-148
TAN Wei, YUAN Zhen, JIANG Jinyuan, CHENG Yongqian, DAI Hongxing. Preparation of different morphologies of Au/α-MnO2 catalyst for oxidation of carbon monoxide and toluene[J]. Journal of Environmental Engineering Technology, 2018, 8(2): 142-148. doi: 10.3969/j.issn.1674-991X.2018.02.019
Citation: TAN Wei, YUAN Zhen, JIANG Jinyuan, CHENG Yongqian, DAI Hongxing. Preparation of different morphologies of Au/α-MnO2 catalyst for oxidation of carbon monoxide and toluene[J]. Journal of Environmental Engineering Technology, 2018, 8(2): 142-148. doi: 10.3969/j.issn.1674-991X.2018.02.019
shu

Preparation of different morphologies of Au/α-MnO2 catalyst for oxidation of carbon monoxide and toluene

doi: 10.3969/j.issn.1674-991X.2018.02.019

  • 1. Chinese Research Academy of Environmental Sciences, Beijing 100012, China

  • 2. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

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  • Corresponding author: Jinyuan JIANG E-mail: jiangjy@craes.org.cn
  • Received Date: 2017-09-18
  • Publish Date: 2018-03-20
    Abstract
  • 1-D nanosized rod-like, wire-like, and tubular α-MnO2 (xAu/α-MnO2,x=2%,4%,8%,10%) were prepared using the hydrothermal and PVA-protected NaBH4 reduction methods at different temperatures with KMnO4 and/or MnSO4 as Mn source, respectively. It is shown that the α-MnO2 in xAu/α-MnO2 was tetragonal in crystal structure, surface area of α-MnO2 nanorods, nanowires, and nanotubes was in the range of 48.4-114.0 m 2/g. The 4%Au/α-MnO2 sample possessed the highest adsorbed oxygen species concentration and the best low-temperature reducibility, thus showing the highest catalytic activity: the T50% and T90% (temperatures required for achieving reactant conversions of 50% and 90%) were 11.4 and 16.3 ℃ for CO oxidation, and 210 and 225 ℃ for toluene oxidation at a space velocity of 20 000 mL/(g ·h), respectively. Based on the characterization results and activity data, it is concluded that the better low-temperature reducibility, higher oxygen adspecies concentration, highly dispersed Au NPs, and stronger interaction between Au NPs and MnO2 nanorods were the main factors influencing the catalytic performance of 4%Au/α-MnO2.

     

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