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摘要: 在340 ℃，5.0 MPa条件下，研究了Fe-Zn-M/HY(M=Cr、Al)复合催化剂上CO2的加氢性能。考察了催化剂中Fe含量对CO2转化率、烃类产物及异构烷烃选择性的影响, 并用CO2-TPD、H2-TPR研究了Fe-Zn-M对CO2的吸附和对H2的还原性能。结果表明, 随着Fe含量的增加, 复合催化剂的活性增强, 烃类产物的选择性降低, 异构烷烃在烃类中的选择性随Fe含量的增加而降低，CO2-TPD、H2-TPR结果表明，随Fe含量的增加，催化剂对CO2的活化吸附量随之增加, 而Fe含量的增加促进了催化剂的还原。Abstract: The hydrogenation of carbon dioxide over Fe-Zn-M/HY (M=Cr, Al) composite catalysts at 340 ℃, 5.0 MPa was studied. Effects of Fe content of Fe-Zn-M catalysts on the conversion of carbon dioxide, the selectivity of hydrocarbon products were investigated. The adsorption performance of carbon dioxide and the reductive performance of Fe-Zn-M (M=Cr, Al) catalysts were studied by means of carbon dioxide Temperature-Programmed-Desorption (TPD) and H2 Temperature-Programmed-Reduction (TPR). The results indicated that the activity of the composite catalysts was improved with the increase of Fe content of Fe-Zn-M catalysts while the selectivity to hydrocarbons was decreased. Furthermore, the fraction of iso-alkanes in hydrocarbons produce decreased with the increase of the Fe content. CO2-TPD and H2-TPR study showed that the higher Fe content could result in more adsorption of carbon dioxide and easier reduction of the catalysts.
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Key words:
- hydrogenation of carbon dioxide /
- Fe content /
- composite catalyst /
- iso-alkanes
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