...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >In situ ATR-FTIR study on the selective photo-oxidation of cyclohexane over anatase TiO2
【24h】

In situ ATR-FTIR study on the selective photo-oxidation of cyclohexane over anatase TiO2

机译：原位ATR-FTIR研究环己烷在锐钛矿型TiO2上的选择性光氧化

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

Anatase-catalyzed photo-oxidation of cyclohexane was analyzed by in situ ATR-FTIR spectroscopy. A set of seven UV-LEDs (375 nm), with a photon flux of 9 x 10(-9) Einstein.cm(-1).s(-1) (at the catalyst surface) was used to initiate the photoreaction. Surface-adsorbed cyclohexanone and water are the primary products of the photocatalytic reaction, formed with a photonic efficiency of 0.5 mmol.Einstein(-1), through a cyclohexyl-hydroperoxide intermediate. Desorbed cyclohexanone and surface carboxylates and carbonates become dominant in the subsequent stages of the reaction, leading to deactivation of the catalyst. The carboxylates and carbonates are most likely formed through nonselective peroxide oxidation and consecutive oxidation of adsorbed cyclohexanone by hydroxyl radicals. In the photocatalytic oxidation of D-12-cyclohexane, D-10-cyclohexanone (in the adsorbed state and dissolved in D-12-cyclohexane) was formed at rates comparable to those of cyclohexanone. The absence of a kinetic isotope effect suggests that the reaction is not limited by the activation of cyclohexane but rather by the activation of oxygen. Desorbed D-10-cyclohexanone was observed at earlier stages and in higher quantities as compared to desorbed cyclohexanone. This is tentatively explained by a higher water content of the applied D-12-cyclohexane compared to cyclohexane, inducing cyclohexanone desorption.
机译：通过原位ATR-FTIR光谱分析了锐钛矿催化的环己烷光氧化反应。一组七个UV-LED（375 nm），光子通量为9 x 10（-9）Einstein.cm（-1）.s（-1）（在催化剂表面），用于引发光反应。表面吸附的环己酮和水是光催化反应的主要产物，通过环己基氢过氧化物中间体以0.5 mmol.Einstein（-1）的光子效率形成。解吸的环己酮以及表面羧酸盐和碳酸盐在反应的后续阶段占主导地位，从而导致催化剂失活。羧酸盐和碳酸盐很可能是通过非选择性的过氧化物氧化和被羟基自由基连续吸附吸附的环己酮而形成的。在D-12-环己烷的光催化氧化中，以与环己酮相当的速率形成D-10-环己酮（处于吸附状态并溶解在D-12-环己烷中）。没有动力学同位素效应表明该反应不受环己烷活化的限制，而是受氧活化的限制。与解吸的环己酮相比，在更早的阶段观察到解吸的D-10-环己酮。试探性地解释为，所施加的D-12-环己烷的水含量高于环己烷，从而引起环己酮解吸。

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