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   作者單位： College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China  刊 名： 天然氣化學(xué)(英文版)  ISTIC SCI 英文刊名： JOURNAL OF NATURAL GAS CHEMISTRY  年，卷(期)： 2005 14(3)  分類號(hào)： O6  關(guān)鍵詞： carbon dioxide   hydrogenation   dimethyl ether   copper   zinc oxide   alumina   silicon dioxide   synthesis  

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