Dimethyl ether synthesis from CO2 hydrogenation on La-modified CuO-ZnO-Al2O3 /HZSM-5 bifunctional catalysts
来源期刊：JOURNAL OF RARE EARTHS2013年第5期
论文作者：高文桂 王华 王禹皓 郭伟 贾淼尧
文章页码：470 - 476
摘 要：A series of CuO-ZnO-Al2O3-La2O3 /HZSM-5 bifunctional catalysts with various La loadings for dimethyl ether （DME） directly synthesized from CO2 hydrogenation were prepared. The catalysts were characterized with N2 adsorption-desorption, X-ray diffraction （XRD）, H2 temperature-programmed reduction （H2-TPR）, NH3 temperature-programmed desorption （NH3-TPD） and N2O titration techniques, and tested for the synthesis of DME directly from CO2 hydrogenation in a fixed-bed reactor. The results showed that the reducibility, dispersion of bifunctional catalysts were strongly dependent on the addition of La. With the addition of appropriate amount of La, the crystallite size of CuO was decreased and the dispersion of Cu on the surface was enhanced, which resulted in the increased conversion of CO2 . It was also found that the selectivity to DME was related to the intensity and amount of strong acid site on the catalyst surface. The presence of La favored the production of DME, and the optimum catalytic activity was obtained when the amount of La was 2.0 wt.%.
高文桂1,2,3，王华1,2,3，王禹皓2,3，郭伟1,2,3，贾淼尧2,3
1. Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology2. Engineering Research Center ofMetallurgical Energy Conservation and Emission Reduction,Ministry of Education,Kunming University of Science and Technology3. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province,Kunming University of Science andTechnology
摘 要：A series of CuO-ZnO-Al2O3-La2O3 /HZSM-5 bifunctional catalysts with various La loadings for dimethyl ether （DME） directly synthesized from CO2 hydrogenation were prepared. The catalysts were characterized with N2 adsorption-desorption, X-ray diffraction （XRD）, H2 temperature-programmed reduction （H2-TPR）, NH3 temperature-programmed desorption （NH3-TPD） and N2O titration techniques, and tested for the synthesis of DME directly from CO2 hydrogenation in a fixed-bed reactor. The results showed that the reducibility, dispersion of bifunctional catalysts were strongly dependent on the addition of La. With the addition of appropriate amount of La, the crystallite size of CuO was decreased and the dispersion of Cu on the surface was enhanced, which resulted in the increased conversion of CO2 . It was also found that the selectivity to DME was related to the intensity and amount of strong acid site on the catalyst surface. The presence of La favored the production of DME, and the optimum catalytic activity was obtained when the amount of La was 2.0 wt.%.
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