Silica-supported CuCo catalysts were prepared by impregnation method with different impregnation sequence for higher alcohols synthesis. These catalysts were characterized by H2-TPR, XRD, N2 adsorption, XPS techniques...Silica-supported CuCo catalysts were prepared by impregnation method with different impregnation sequence for higher alcohols synthesis. These catalysts were characterized by H2-TPR, XRD, N2 adsorption, XPS techniques and CO selective hydrogenation reaction measurement. The effects of impregnation sequence on the structure and performance of catalysts were investigated, and there were important influences on the selectivity to higher alcohols. There was a strong synergistic effect between copper and cobalt for the co-impregnated sample. The CuCo/SiO2 catalyst prepared by co- impregnation showed a better yield of total alcohols, and a higher selectivity to total alcohols which reached 51.5%.展开更多
In this paper, the hydrogenation of carbon monoxide over Cu-MnO x/Al 2O 3 composite catalysts system prepared by impregnation method has been studied The effects of addition of MnO x on activity and DME selectivity fo...In this paper, the hydrogenation of carbon monoxide over Cu-MnO x/Al 2O 3 composite catalysts system prepared by impregnation method has been studied The effects of addition of MnO x on activity and DME selectivity for hydrogenation of Cu-MnO x/Al 2O 3 catalysts were investigated by a micro reactor-GC system The crystal structure and reduction property of the catalysts were also studied by means of XRD, TPR The results indicated that the addition of MnO x increased the activity and DME selectivity of CuO/Al 2O 3 catalyst for the hydrogenation of carbon monoxide, and the most active and selective for DME is the catalyst with a molar ratio of Cu/Mn=1∶1 The addition of MnO x cause the TPR peak of CuO/Al 2O 3 to move to a high temperature; at the same time, the hydrogen spillover on Cu made MnO x reduction easier The results of XRD indicated that the addition of MnO x increased the dispersion of CuO on γ-Al 2O展开更多
The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were ...The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.展开更多
ZrO2 in different structures and CexZr4-xO8 solid solutions have been prepared by a sol-gel related method with propionic acid as the solvent. The results of their characterization and CO hydro-genation performance ev...ZrO2 in different structures and CexZr4-xO8 solid solutions have been prepared by a sol-gel related method with propionic acid as the solvent. The results of their characterization and CO hydro-genation performance evaluation show that t-ZrO2 has better catalytic performance for CO hydrogenation to hydrocarbon than m-ZrO2. Cerium (Ⅲ) acetate and zirconium (Ⅳ) acetylacetonate have been chosen as the most suitable starting materials for CexZr4-xO8 solid solution preparation. Ce-Zr reducibility properties are increased by the incorporation of zirconium oxide in the ceria structure. Ce2Zr2O8 exhibits a higher activity, lower methane selectivity and higher iso-C4 selectivity than tetragonal ZrO2. This implies that the formation mechanism of C4 hydrocarbons, especially that for the iso-C4 fraction is different over Ce2Zr2O8 and t-ZrO2.展开更多
基金National Natural Science Foundation of China(20590360)New Century Excellent Talent Project of China(NCET-05-0783)
文摘Silica-supported CuCo catalysts were prepared by impregnation method with different impregnation sequence for higher alcohols synthesis. These catalysts were characterized by H2-TPR, XRD, N2 adsorption, XPS techniques and CO selective hydrogenation reaction measurement. The effects of impregnation sequence on the structure and performance of catalysts were investigated, and there were important influences on the selectivity to higher alcohols. There was a strong synergistic effect between copper and cobalt for the co-impregnated sample. The CuCo/SiO2 catalyst prepared by co- impregnation showed a better yield of total alcohols, and a higher selectivity to total alcohols which reached 51.5%.
文摘In this paper, the hydrogenation of carbon monoxide over Cu-MnO x/Al 2O 3 composite catalysts system prepared by impregnation method has been studied The effects of addition of MnO x on activity and DME selectivity for hydrogenation of Cu-MnO x/Al 2O 3 catalysts were investigated by a micro reactor-GC system The crystal structure and reduction property of the catalysts were also studied by means of XRD, TPR The results indicated that the addition of MnO x increased the activity and DME selectivity of CuO/Al 2O 3 catalyst for the hydrogenation of carbon monoxide, and the most active and selective for DME is the catalyst with a molar ratio of Cu/Mn=1∶1 The addition of MnO x cause the TPR peak of CuO/Al 2O 3 to move to a high temperature; at the same time, the hydrogen spillover on Cu made MnO x reduction easier The results of XRD indicated that the addition of MnO x increased the dispersion of CuO on γ-Al 2O
基金This work was financially by the Chinese Science and Technology Ministry (Grant No.G1999022404)
文摘The kinetics of CO hydrogenation for the synthesis of C_2 oxygenates overRh-Mn-Li-Fe/SiO_2 was investigated. Kinetic parameters for the formation of ethanol, acetaldehyde,C'2 oxygenates, methanol and methane were obtained. The activation energy. H_2 and CO dependenceorders for ethanol and acetaldehyde formation differed greatly, the large difference seemed to implythat they were formed through different intermediates.
文摘ZrO2 in different structures and CexZr4-xO8 solid solutions have been prepared by a sol-gel related method with propionic acid as the solvent. The results of their characterization and CO hydro-genation performance evaluation show that t-ZrO2 has better catalytic performance for CO hydrogenation to hydrocarbon than m-ZrO2. Cerium (Ⅲ) acetate and zirconium (Ⅳ) acetylacetonate have been chosen as the most suitable starting materials for CexZr4-xO8 solid solution preparation. Ce-Zr reducibility properties are increased by the incorporation of zirconium oxide in the ceria structure. Ce2Zr2O8 exhibits a higher activity, lower methane selectivity and higher iso-C4 selectivity than tetragonal ZrO2. This implies that the formation mechanism of C4 hydrocarbons, especially that for the iso-C4 fraction is different over Ce2Zr2O8 and t-ZrO2.
