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Dimethyl Carbonate Synthesis from Urea Methanolysis over ZnO–Nb2O5–TiO2 Mixed Oxide Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.iecr.9b05637 Saeid Asghari 1 , Mehran Ghiaci 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.iecr.9b05637 Saeid Asghari 1 , Mehran Ghiaci 1
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Regarding the environmental downsides of using traditional methods for dimethyl carbonate (DMC) production, urea alcoholysis approaches have been the subject of intense interest in recent years. As a general trend, the dissipation of reactivity in metal oxide catalysts, which is mostly done by leaching, has caused a dramatic fall in the DMC yield. Herein, a series of catalysts with different molar ratios of ZnO, Nb2O5, and TiO2 were prepared by a modified sol–gel method and used in urea methanolysis to DMC. Incorporation of ZnO and Nb2O5 into the TiO2 matrix provided limited or even zero leaching, resulting in easy recovery and reusability of the catalysts. The parameters effective in the catalytic performance were investigated. Among the tested catalysts, ZnO(0.54)–Nb2O5(0.20)–TiO2(0.26) exhibited the best performance with a DMC yield of 39.1% under optimal conditions. Overall, this work provides a suitable method for increasing the stability of metal oxide catalysts.
中文翻译：
ZnO–Nb 2 O 5 –TiO 2混合氧化物催化尿素甲醇合成碳酸二甲酯
关于使用传统方法生产碳酸二甲酯（DMC）的环境不利方面，近年来，尿素醇解法已成为人们关注的主题。作为一般趋势，金属氧化物催化剂中反应活性的消散（主要是通过浸出完成）已导致DMC收率急剧下降。在此，通过改进的溶胶-凝胶法制备了一系列具有不同摩尔比的ZnO，Nb 2 O 5和TiO 2的催化剂，并将其用于尿素甲醇分解为DMC。将ZnO和Nb 2 O 5掺入TiO 2中基质提供有限的浸出或什至零浸出，从而使催化剂易于回收和再利用。研究了有效催化性能的参数。在测试的催化剂中，ZnO（0.54）–Nb 2 O 5（0.20）–TiO 2（0.26）在最佳条件下表现出最佳性能，DMC收率为39.1％。总的来说，这项工作提供了增加金属氧化物催化剂稳定性的合适方法。
更新日期：2020-03-26
中文翻译：
ZnO–Nb 2 O 5 –TiO 2混合氧化物催化尿素甲醇合成碳酸二甲酯
关于使用传统方法生产碳酸二甲酯（DMC）的环境不利方面，近年来，尿素醇解法已成为人们关注的主题。作为一般趋势，金属氧化物催化剂中反应活性的消散（主要是通过浸出完成）已导致DMC收率急剧下降。在此，通过改进的溶胶-凝胶法制备了一系列具有不同摩尔比的ZnO，Nb 2 O 5和TiO 2的催化剂，并将其用于尿素甲醇分解为DMC。将ZnO和Nb 2 O 5掺入TiO 2中基质提供有限的浸出或什至零浸出，从而使催化剂易于回收和再利用。研究了有效催化性能的参数。在测试的催化剂中，ZnO（0.54）–Nb 2 O 5（0.20）–TiO 2（0.26）在最佳条件下表现出最佳性能，DMC收率为39.1％。总的来说，这项工作提供了增加金属氧化物催化剂稳定性的合适方法。
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