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Conversion of Carbon dioxide to hydrocarbons over hybrid catalysts containing methanol synthesis catalyst and zeolite
1, 2 , * 3
1  The university of kitakyushu
2  Faculty of Environmental Engineering, Fukuoka, Japan
3  Faculty of Environmental Engineering, The University of Kitakyushu, Fukuoka, Japan
Academic Editor: Guido Busca

Abstract:

The hydrogenation of carbon dioxide to C2, C3, and C4 paraffins was examined by using hybrid catalysts containing a Cu-Zn catalyst with Zr-modified H-ZSM-5 zeolite, or Pd-modified β zeolite with H-ZSM-5, or Pt/SiO2 with H-ZSM-5, or Pd/SiO2 with H-ZSM-5 β zeolite. Various factors which affect catalyst activities were examined such as reaction temperature, pressure, and the influence of the SiO2/Al2O3 ratio. The tests were conducted at 260-300°C, 2-3 MPa, a W/F of 10 g.h/mol, and with a H2/CO2 mole ratio of 3. The influence of the SiO2/Al2O3 ratio on H-ZSM-5 zeolite played an important role in hydrocarbon distribution. When H-ZSM-5 was used on the zeolite with low alumina content (SiO2/Al2O3=100), the product contained olefins and dimethyl ether with a large amount of C5 and C6, whereas that for the zeolite with high alumina content (SiO2/Al2O3=40) showed an excellent conversion of carbon dioxide to hydrocarbon. Under mild temperature at 280°C, CO2 conversion reached 23% with a hydrocarbon selectivity as high as 80%, while keeping the dry gas (CH4) selectivity below 1% by using the hybrid catalysts. When Pd/SiO2 with β zeolite was used for the hybrid catalysts, butane was produced with a high selectivity over 50% at 280°C and 3 MPa with a small amount of coke deposition.

Keywords: Carbon dioxide, Hydrocarbon, Methanol, Zeolite
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