Effect of calcination atmospheres on the catalytic performance of nano-CeO₂ in direct synthesis of DMC from methanol and CO₂

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• 作者：Zixiang Cui ; Jie Fan ; Huijuan Duan ; Junfeng Zhang…
• 关键词：Nano ; CeO2 ; Calcination Temperature ; Valence State ; Methanol ; CO2 ; DMC
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：34
• 期：1
• 页码：29-36
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering; Catalysis; Materials Science, general; Biotechnology;
• 出版者：Springer US
• ISSN：1975-7220
• 卷排序：34

文摘

Nano-CeO₂ was prepared through the calcination of Ce(OH)₃ precursor in different atmospheres (H₂, Ar, air, O₂), which was prepared by a hydrothermal method, and then used as catalysts in the direct synthesis of dimethyl carbonate (DMC) from methanol and CO₂. The results indicated that the catalyst calcined in O₂ (CeO₂-O₂) showed an optimum catalytic performance, and the yield of DMC reached to 1.304 mmol/mmol_cat. In addition, reaction temperature and weight of catalyst were optimized. Based on characterizations of the catalysts, the ratio of Ce(IV)/Ce(III) and Lewis acid-base property of nano-CeO₂ catalyst could be adjusted through different calcination atmosphere treatment. It was determined that the higher activity of CeO₂-O₂ catalyst is mainly attributed to its higher ratio of Ce(IV)/Ce(III) as well as abundant and moderate intensity Lewis acid base sites.