Dimethyl ether synthesis from CO2 hydrogenation on La-modified CuO-ZnO-Al2O3/HZSM-5 bifunctional catalysts

A series of CuO-ZnO-Al2O3-La2O3/HZSM-5 biftmctional 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-...

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Bibliographic Details
Published inJournal of rare earths Vol. 31; no. 5; pp. 470 - 476
Main Author 高文桂 王华 王禹皓 郭伟 贾淼尧
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2013
Subjects
ALUMINUM OXIDE
bifunctional catalyst
CARBON DIOXIDE
Catalysis
CATALYSTS
CO2 hydrogenation
CO2加氢
COPPER OXIDE
Dimethyl ether
Dispersions
DME
FABRICATION
HYDROGEN
Hydrogenation
lanthanum
NH3-TPD
Rare earth metals
rare earths
Synthesis
ZINC OXIDE
二甲醚
催化剂表面
加氢合成
双功能催化剂
程序升温脱附
香格里拉
bifunctional catalyst
lanthanum
DME
CO2 hydrogenation
rare earths
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Summary:A series of CuO-ZnO-Al2O3-La2O3/HZSM-5 biftmctional 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 ofbifunctional catalysts were strongly dependent on the addition of La. With the addition of appropri- ate amount of La, the crystaUite 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.%.
Bibliography:11-2788/TF
GAO Wengui, WANG Hua, WANG Yuhao, GUO Wei, Miaoyao （1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China; 3. State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China）
CO2 hydrogenation; DME; bifunctional catalyst; lanthanum; rare earths
A series of CuO-ZnO-Al2O3-La2O3/HZSM-5 biftmctional 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 ofbifunctional catalysts were strongly dependent on the addition of La. With the addition of appropri- ate amount of La, the crystaUite 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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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60305-6