The proportion of Ce⁴⁺ in surface of Ce_xZr_1-xO₂ catalysts: The key parameter for direct carboxylation of methanol to dimethyl carbonate

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• 作者：Hui Liu^a ; Weijian Zou^a ; Xingliang Xu^a ; Xianlong Zhang^a ; Yongquan Yang^a ; Huijuan Yue^a ; Yang Yu^b ; Ge Tian^a ; ^{tiange@jlu.edu.cn} ; Shouhua Feng^a
• 关键词：CexZr1-xO2 ; CO2 ; Dimethyl carbonate ; The proportion of Ce4+ ; Acid-base properties
• 刊名：Journal of CO2 Utilization
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：43-49
• 全文大小：1491 K
• 卷排序：17

文摘

In order to correlate the physico-chemical properties of CexZr1-xO2 catalysts with their catalytic activities for direct carboxylation of methanol to dimethyl carbonate (DMC), ceria-zirconia mixed oxides with the same nominal composition (Ce0.5Zr0.5O2), which were prepared by different methods, were applied. The catalysts were characterized by means of XRD, N2 adsorption, ICP-MS, NH3-TPD, CO2-TPD, Raman spectroscopy and XPS. Significant variations in their physico-chemical properties were observed by varying the preparation conditions. The results showed that the catalytic activity of the ceria-zirconia mixed oxides increased with improving the proportion of Ce4+, acidity and basicity of the catalyst surface. And the number of surface Ce4+ content is the most important factor.