层状Cu/ZnO/Al2O3催化剂的制备及其催化CO2加氢合成甲醇的性能

doi:10.3969/j.issn.1007-2861.2015.05.019

Abstract

Abstract:

Layered Cu/ZnO/Al₂O₃ catalysts were prepared with ahomogeneous precipitation method using urea hydrolysis. The mixed oxides were then obtained by the calcination and reduction of precursors and tested for methanol synthesis from CO₂ hydrogenation. The prepared materials were characterized by X-ray diffraction (XRD), thermogravimetric(TG), scanning electron microscope (SEM), X-ray fluorescence (XRF), BET, H₂-temperature program reduction (H₂-TPR), N₂O chemisorption, and CO₂-temperature program desorption (CO₂-TPD) techniques. Compared with the catalysts prepared by conventional co-precipitation method, the crystallinity degree of precursors, the BET specific surface area and dispersion of copper were increased with ahomogeneous precipitation method. This improvement was significant with reflux treatment during the homogeneous precipitation process. Evaluation of these catalysts for CO₂ hydrogenation to methanol revealed that the CO₂ conversion increased with increase of Cu specific surface area, and methanol selectivity was related to the proportion of strongly basic sites. Therefore, the maximum methanol yield was obtained over the Cu/ZnO/Al₂O₃ catalyst prepared using ahomogeneous precipitation method with reflux treatment.

Key words: CO₂hydrogenation, Cu/ZnO/Al₂O₃ catalyst , layered structure compound, methanol, urea hydrolysis

XIAO Shuo1,2, GAO Peng2, YANG Haiyan2, XIA Lin2, ZHANG Jianming2, CHEN Zhiwen1, WANG Hui2. Preparation of layered Cu/ZnO/Al₂O₃ catalyst and its catalytic performance for CO₂ hydrogenation to methanol[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(2): 218-230.

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Preparation of layered Cu/ZnO/Al₂O₃ catalyst and its catalytic performance for CO₂ hydrogenation to methanol

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Preparation of layered Cu/ZnO/Al2O3 catalyst and its catalytic performance for CO2 hydrogenation to methanol

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Preparation of layered Cu/ZnO/Al₂O₃ catalyst and its catalytic performance for CO₂ hydrogenation to methanol