...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Kinetic evaluation of direct NO decomposition and NO-CO reaction over dendrimer-derived bimetallic Ir-Au/Al2O3 catalysts
【24h】

Kinetic evaluation of direct NO decomposition and NO-CO reaction over dendrimer-derived bimetallic Ir-Au/Al2O3 catalysts

机译：树枝状聚合物衍生的双金属Ir-Au / Al2O3催化剂上直接NO分解和NO-CO反应的动力学评估

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

The effects of Au on the catalytic performance of Ir metal towards NO reduction by CO and direct NO decomposition have been investigated over dendrimer-derived Ir-Au bimetallic catalyst. Results were also compared to a catalyst prepared by conventional incipient wetness impregnation of metal salts. Characterization of Ir-Au bimetallic samples using scanning transmission electron microscopy, H2 chemisorption and temperature programmed desorption of NO reveals that highly dispersed Ir-Au particles can be obtained by dendrimer templating method. In-situ transmission Fourier transform infrared spectroscopy following adsorption of probe molecules (i.e., CO and NO) on the dendrimer-derived Ir-Au bimetallic sample indicated the presence of electron transfer from Ir to Au sites. In contrast, a geometric effect of Au on Ir was observed over the conventional-derived sample, consistent with X-ray photo-electron spectroscopy measurements. These properties influence the catalytic performance, with higher selectivity towards N2O and a better intrinsic catalytic turnover frequency for reduction of NO by CO and NO decomposition observed for the dendrimer-derived sample. Overall, the results suggest that both NO-CO and NO decomposition reaction are structure-sensitive reactions.
机译：在树枝状聚合物衍生的Ir-Au双金属催化剂上，研究了Au对Ir金属催化CO还原NO和直接NO分解的催化性能的影响。还将结果与通过常规初期湿法浸渍金属盐制备的催化剂进行了比较。 Ir-Au双金属样品的特征在于使用扫描透射电子显微镜，H2化学吸附和NO的程序升温脱附，表明可以通过树枝状聚合物模板法获得高度分散的Ir-Au颗粒。在树枝状聚合物衍生的Ir-Au双金属样品上吸附探针分子（即CO和NO）后，原位透射傅里叶变换红外光谱表明存在从Ir到Au的电子转移。相反，在常规来源的样品上观察到Au对Ir的几何作用，这与X射线光电子能谱测量结果一致。这些性质影响催化性能，对树枝状聚合物衍生的样品观察到较高的对N2O的选择性和较好的固有催化转换频率，可通过CO还原NO和NO分解。总体而言，结果表明，NO-CO和NO分解反应均为结构敏感反应。

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