C2-oxygenates synthesis through CO hydrogenation on SiO2-ZrO2 supported Rh-based catalyst: The effect of support

Authors: Lupeng Han, Dongsen Mao, Jun Yu, Qiangsheng Guo, Guanzhong Lu

Abstract:
Rh-Mn-Li catalysts supported on SiO₂, ZrO₂ and SiO₂-ZrO₂ mixed oxides with various molar ratios of Si/Zr were prepared and tested for the synthesis of C₂-oxygenates from syngas. Compared with pure SiO₂ and ZrO₂ supported catalysts, catalysts supported on SiO₂-ZrO₂ mixed oxides showed higher activity and C₂- oxygenates selectivity, in which Rh-Mn-Li/SiO₂-ZrO₂ (molar ratio of Si/Zr = 1:3) exhibited the best yield of C₂-oxygenates. The effect ofthe support on the performance ofthe Rh-based catalysts was investigated comprehensively by XRD, N2 adsorption-desorption, H₂ and CO uptakes, FT-IR, XPS, H₂-TPR, TPSR and CO-TPD techniques. The results indicated that the chemical state of Rh, CO adsorption species, dispersion of Rh and the ability of CO hydrogenation varied over catalysts supported on SiO₂, ZrO₂ and SiO₂-ZrO₂ mixed oxides, which led to the diverse catalytic activity toward C₂-oxygenates synthesis. 

Keywords:
Syngas
C₂-oxygenates
Rh-based catalyst
SiO₂-ZrO₂ mixed oxide

Published in: Applied catalysis A: General  (Volume 454, Pages 1-172, 15 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

C2-oxygenates synthesis through CO hydrogenation on SiO2-ZrO2 supported Rh-based catalyst: The effect of support

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