...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the Chinese Institute of Chemical Engineers >Preferential oxidation of carbon monoxide over Pt, Au monometallic catalyst, and Pt-Au bimetallic catalyst supported on ceria in hydrogen-rich reformate
【24h】

Preferential oxidation of carbon monoxide over Pt, Au monometallic catalyst, and Pt-Au bimetallic catalyst supported on ceria in hydrogen-rich reformate

机译：富氢重整产品中二氧化铈负载的Pt，Au单金属催化剂和Pt-Au双金属催化剂对一氧化碳的优先氧化

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

The objective of this paper was to study a preferential oxidation (PROX) of carbon monoxide over monometallic catalysts including Pt, An and Pt-Au bimetallic catalyst supported on ceria in hydrogen-rich reformate. Single step sol-gel method (SSG) and impregnation on sol-gel method (ISG) were chosen for the preparation of the catalysts. The characteristics of these catalysts were investigated by X-ray diffractometer (XRD), Brunauer-Emmet-Teller (BET) method, transmission electron microscope (TEM), scanning electron microscope (SEM) and temperature-programmed reduction (TPR). The XRD patterns of the catalysts showed only the peaks of ceria crystallite and no metal peak appeared. From TEM images, the active components were seen to be dispersed throughout the ceria support. The TPR patterns of PtAu/CeO2 catalyst prepared by SSG showed the reduction peaks were within a low temperature range and therefore, the catalysts prepared by SSG exhibited excellent catalytic activity for preferential oxidation of CO. Bimetallic Pt-Au catalyst improved the activity (90% conversion and 50% selectivity at 90 degrees C) because of the formation of a new phase. When the metal content of (1:1) PtAu/CeO2 catalyst prepared by SSG was increased, the CO conversion did not change much while the selectivity decreased in the low temperature range (50-90 degrees C). The CO conversion increased with increasing W/F ratio. The presence Of CO2 and H2O had a negative effect on CO conversion and selectivity due to blocking of carbonate and water on active sites. (C) 2007 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
机译：本文的目的是研究富氢重整产品中负载在一氧化铈上的单金属催化剂（包括Pt，An和Pt-Au双金属催化剂）对一氧化碳的优先氧化（PROX）。选择单步溶胶-凝胶法（SSG）和溶胶-凝胶法浸渍（ISG）制备催化剂。通过X射线衍射仪（XRD），Brunauer-Emmet-Teller（BET）法，透射电子显微镜（TEM），扫描电子显微镜（SEM）和程序升温还原（TPR）研究了这些催化剂的特性。催化剂的XRD图谱仅显示二氧化铈微晶的峰，没有金属峰。从TEM图像可以看出，活性成分分散在整个二氧化铈载体上。 SSG制备的PtAu / CeO2催化剂的TPR图谱显示还原峰在低温范围内，因此SSG制备的催化剂表现出优异的催化活性，可优先催化CO氧化。双金属Pt-Au催化剂提高了活性（90％由于形成了新相，因此在90摄氏度时的转化率和50％的选择性）。当通过SSG制备的（1：1）PtAu / CeO2催化剂的金属含量增加时，CO转化率变化不大，而选择性在低温范围（50-90摄氏度）下降。 CO转化率随W / F比的增加而增加。由于碳酸盐和水在活性位上的封闭，CO2和H2O的存在对CO转化率和选择性产生负面影响。 （C）2007台湾化学工程师学会。由Elsevier B.V.发布。保留所有权利。

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