Xue-Wen Zhang, Jing-Yun Xu, Yi Lu, Fei Wang, Jie Xu , Bing Xue
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引用次数: 0
Abstract
Dimethyl carbonate (DMC) is a building block in the modern chemical industry, and the transesterification of ethylene carbonate (EC) with methanol is a more sustainable strategy for the synthesis of DMC. Wherein, the design of metal-free and high-activity catalysts that can be easily prepared is a crucial research topic for clean synthesis of DMC. In this work, C3N4-T materials with non-metal components, high degrees of polycondensation, and adjustable distributions of nitrogen-containing species were successfully prepared by a facile molten-salt approach. Compared with g-C3N4 prepared by the traditional thermal polycondensation method, C3N4-T materials own larger specific surface areas and a higher degree of intralayer condensation. By simply adjusting the calcination temperatures, the fractions of bridging nitrogen species can be tuned, resulting in an improvement in alkaline strength. For the transesterification reaction of EC with methanol, the C3N4-500 materials demonstrated much higher activity than g-C3N4. Under a lower reaction temperature (100 °C) and a shorter reaction time (3 h), the maximum conversion of EC was 79.9 %. According to the characterization results of XPS and Hammett titration, the correlation between the catalytic activity of various C3N4-T materials and the alkaline properties was deliberated.
期刊介绍:
Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications.
Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.