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Al2O3 Effect on the Catalytic Activity of Cu-ZnO-Al2O3-SiO2 Catalysts for Dimethyl Ether Synthesis from CO2 Hydrogenatio
by a pseudo sol-gel method has been investigated and these catalysts were characterized by XRD,H2-TPR,XPS,NH3-TPD and CO2-TPD techniques. As revealed by XRD and H2-TPR,the added alumina produces high dispersion of CuO and makes the reduction of CuO difficult. XPS analysis detects a remarkably high Al3+ enrichment at the surface of calcined samples,along with a decrease of Eb of Cu 2p3/2,which confirms the Cu-Al interaction.Another important role of Al2O3 would be to incorporate into the SiO2 structure to form the acid-base sites for ether formation. The reaction results shows that the addition of Al2O3 exhibits a promoting effect on the CO2 conversion only when its content is below 1.4％,and an optimal DME selectivity is obtained when 4.0％Al2O3 is added,indicating a better 'synergistic effect' is present between the methanol forming component and the acidic component in bifunctional catalysts. Possible relationship between the catalytic activity and the Cu-Al interaction as well as the surface acidity is discussed.
作 者： Jiyuan Wang Chongyu Zeng 作者单位： College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China 刊 名： 天然气化学(英文版) ISTIC SCI 英文刊名： JOURNAL OF NATURAL GAS CHEMISTRY 年，卷(期)： 2005 14(3) 分类号： O6 关键词： carbon dioxide hydrogenation dimethyl ether copper zinc oxide alumina silicon dioxide synthesis【Al2O3 Effect on the Catalytic Activi】相关文章：
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