...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Kinetic analysis of hexose conversion to methyl lactate by Sn-Beta: effects of substrate masking and of water
【24h】

Kinetic analysis of hexose conversion to methyl lactate by Sn-Beta: effects of substrate masking and of water

机译：动力学分析甲基己糖转换乳酸Sn-Beta:衬底屏蔽的影响和水

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Simple sugars show promise as substrates for the formation of fuels and chemicals using heterogeneous catalysts in alcoholic solvents. Sn-Beta is a particularly well-suited catalyst for the cleavage, isomerization and dehydration of sugars into more valuable chemicals. In order to understand these processes and save resources and time by optimising them, kinetic and mechanistic analyses are helpful. Herein, we study substrate entry into the Sn-Beta-catalysed methyl lactate process using abundant hexose substrates. NMR spectroscopy is applied to show that the formation of methyl lactate occurs in two kinetic regimes for fructose, glucose and sucrose. The majority of methyl lactate is not formed from the substrate directly, but from methyl fructosides in a slow regime. At 160 degrees C, more than 40% of substrate carbon are masked (i.e. reversibly protected in situ) as methyl fructosides within a few minutes when using hydrothermally synthesised Sn-Beta, while more than 60% methyl fructosides can be produced within a few minutes using post-synthetically treated Sn-Beta. A significant fraction of the substrate is thus masked by rapid methyl fructoside formation prior to subsequent slow release of fructose. This release is the rate-limiting step in the Sn-Beta-catalysed methyl lactate process, but it can be accelerated by the addition of small amounts of water at the expense of the maximum methyl lactate yield.
机译：单糖显示承诺的基质燃料和化学品使用的形成异构催化剂在酒精溶剂。Sn-Beta是一个特别适合催化剂乳沟,异构化和脱水糖转化为更有价值的化学物质。了解这些流程和节省资源和时间的优化,动能机械的分析是有帮助的。研究底物进入Sn-Beta-catalysed使用丰富的己糖乳酸甲酯过程基板。乳酸甲酯的形成发生在两种动力学机制果糖,葡萄糖和蔗糖。直接形成于衬底,但是从甲基果糖甙在缓慢的政权。度,超过40%的底物碳蒙面(即可逆原位保护)当甲基果糖甙在几分钟使用热水地合成Sn-Beta,超过60%甲基果糖甙可以生产在几分钟内使用post-syntheticallySn-Beta治疗。基质由快速甲基因此掩盖了果糖甙形成之前,随后缓慢果糖的释放。病原Sn-Beta-catalysed的一步乳酸甲酯的过程,但它可以加速通过添加少量的水最大乳酸甲酯产量的费用。

著录项

相似文献

  • 外文文献
  • 中文文献
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