• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Highly selective conversion of guaiacol to tert-butylphenols in supercritical ethanol over a H2WO4 catalyst
【24h】

Highly selective conversion of guaiacol to tert-butylphenols in supercritical ethanol over a H2WO4 catalyst

机译：在H2WO4催化剂上，在超临界乙醇中将愈创木酚选择性地转化为叔丁基苯酚

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The conversion of guaiacol is examined at 300 °C in supercritical ethanol over a H _(2) WO _(4) catalyst. Guaiacol is consumed completely, meanwhile, 16.7% aromatic ethers and 80.0% alkylphenols are obtained. Interestingly, tert -butylphenols are produced mainly with a high selectivity of 71.8%, and the overall selectivity of 2,6-di- tert -butylphenol and 2,6-di- tert -butyl-4-ethylphenol is as high as 63.7%. The experimental results indicate that catechol and 2-ethoxyphenol are the intermediates. Meanwhile, the WO _(3) sites play an important role in the conversion of guaiacol and the Br?nsted acid sites on H _(2) WO _(4) enhance the conversion and favour a high selectivity of the tert -butylphenols. The recycling tests show that the carbon deposition on the catalyst surface, the dehydration and partial reduction of the catalyst itself are responsible for the decay of the H _(2) WO _(4) catalyst. Finally, the possible reaction pathways proposed involve the transetherification process and the alkylation process during guaiacol conversion.
机译：在H _（2）WO _（4）催化剂上，于300°C在超临界乙醇中检查愈创木酚的转化率。愈创木酚被完全消耗，同时获得16.7％的芳族醚和80.0％的烷基酚。有趣的是，主要以71.8％的高选择性生产叔丁基苯酚，而2,6-二叔丁基苯酚和2,6-二叔丁基-4-乙基苯酚的总选择性高达63.7％。 。实验结果表明，邻苯二酚和2-乙氧基苯酚是中间体。同时，WO _（3）位点在愈创木酚的转化中起重要作用，而H _（2）上的布朗斯台德酸位点WO _（4）增强了转化率并有利于叔丁基苯酚的高选择性。循环测试表明，催化剂表面的碳沉积，催化剂本身的脱水和部分还原是H_（2）WO_（4）催化剂衰减的原因。最后，提出的可能的反应途径涉及愈创木酚转化过程中的醚交换过程和烷基化过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号