期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 16, 期 6, 页码 923-928出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2010.09.007
关键词
Oxidative coupling of methane (OCM); Incipient wetness impregnation; Nanocatalyst synthesis; Promoter; Active sites
资金
- National Petrochemical Company, Research & Technology (NPC-RT)
- Isfahan University of Technology (IUT)
The M-Na-Mn/SiO2 nanocatalysts (M = W, Mo, Nb, V, Cr) were synthesized with the size of 12-92 nm by incipient wetness impregnation method to study the effect of different promoters on the catalytic performance in the oxidative coupling of methane. The results at 1 atm, 1048 K, 2500 ml h(-1) g(-1), and CH4/O-2/N-2 = 2/2/1 revealed that C-2 selectivity was significantly increased (31.6%) in the order of W > Mo > Nb > Cr > V whereas moderate enhancement (12.6%) was observed in the CH4 conversion in the order of W > Cr > Nb > Mo > V. The results of the characterization techniques (Raman, FT-IR, BET, TGA/DTA and XRD) demonstrated that Mn2O3 and alpha-cristobalite were the predominant species and active sites in the nanocatalyst surface and Na2MoO4, Na2WO4 and Mn2O3 crystalline phases contributed to achieving high selectivity of C-2 products. The redox mechanism involving two metal sites such as Mn3+/2+ and W6+/5+ or Mn3+/2+ and Mo6+/5+ was found to be the most compatible route with the OCM reaction path in which CH4 and O-2 adsorption was the controlling step. (C) 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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