期刊
JOURNAL OF CATALYSIS
卷 322, 期 -, 页码 38-48出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.09.024
关键词
Three-dimensionally ordered macroporous cobalt oxide; Supported Au-Pd alloy nanocatalyst; Toluene oxidation; Water vapor effect; Oxygen activation
资金
- NSF of China [21377008]
- Education and Teaching-Postgraduate Students Education Beijing Municipality Excellent Ph.D. Thesis Supervisor [20111000501]
- Education and Teaching-Postgraduate Students Cultivation-National Excellent Ph.D. Thesis Supervisor and Cultivation Base Construction [005000542513551]
- Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions
- Scientific Research Base Construction-Science and Technology Creation Platform-National Materials Research Base Construction
The polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction routes were adopted to prepared three-dimensionally ordered macroporous (3DOM) Co3O4 and its supported gold-palladium alloy (xAuPd/3DOM Co3O4, x = 0.50-1.99 wt% and Au/Pd mass ratio = 1:1) nanocatalysts. The 3DOM Co3O4 supported Au-Pd samples performed much better than supported single Au or Pd samples, with the 1.99AuPd/3DOM Co304 sample showing the best performance: the T-10%, T-50%, and T-90% (temperatures required for achieving toluene conversions of 10%, 50%, and 90%) were 145, 164, and 168 degrees C at a space velocity of 40,000 mL/(g h), respectively. The 3DOM Co3O4 supported Au-Pd nanocatalysts also exhibited better catalytic stability and more moisture-tolerant ability than the supported Au or Pd samples for toluene oxidation. The apparent activation energies (33-41 kJ/mol) over xAuPd/3DOM Co3O4 were much lower than those (52-112 kJ/mol) over 3DOM Co3O4 and supported single Au or Pd samples, with the 1.99AuPd/3DOM Co3O4 sample exhibiting the lowest apparent activation energy (33 kJ/mol). It is concluded that better oxygen activation ability and stronger noble metal-3DOM Co3O4 interaction were responsible for the excellent catalytic performance of 1.99AuPd/3DOM Co3O4. (C) 2014 Elsevier Inc. All rights reserved.
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