Abstract

In this work CaO-based catalysts were found to be efficient heterogeneous catalysts for the methylation of phenol with dimethyl carbonate (DMC) in a closed high pressure reactor. The optimization experiments have been carried out to obtain best phenol conversion and the results showed that CaO catalyst modified with KCl had the best catalytic performance. When the reaction was carried out at 200°C, with phenol to dimethyl carbonate molar ratio of 1 : 2, 15% KCl/CaO catalyst dosage of 3%, reaction time 9 h, 100% conversion of phenol and 95% selectivity towards anisole have been achieved. The structure and properties of the materials were thoroughly characterized by Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET). The close correlation was found between surface basicity of the catalysts and their catalytic performance for phenol conversion and anisole selectivity.

中文翻译：

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CaO负载催化剂上碳酸二甲酯选择性O-甲基化苯酚

摘要

在这项工作中，发现 CaO 基催化剂是在封闭的高压反应器中用碳酸二甲酯 (DMC) 对苯酚进行甲基化的有效多相催化剂。进行了优化实验以获得最佳的苯酚转化率，结果表明用 KCl 改性的 CaO 催化剂具有最佳的催化性能。当反应在 200°C 下进行时，苯酚与碳酸二甲酯的摩尔比为 1:2，15% KCl/CaO 催化剂用量为 3%，反应时间为 9 h，苯酚转化率为 100%，苯甲醚选择性为 95%已经实现。材料的结构和性能通过傅里叶变换红外光谱 (FTIR)、扫描电子显微镜 (SEM) 和 Brunauer-Emmett-Teller (BET) 进行了彻底表征。