高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (10): 20220175.doi: 10.7503/cjcu20220175

• 研究论文: 无机化学 • 上一篇    下一篇

中空纤维Au-CeZr/FAU催化膜的制备及在富氢气氛CO选择性氧化反应中的应用

魏李娜, 彭莉, 朱锋, 顾鹏飞, 顾学红()   

  1. 南京工业大学化工学院, 材料化学工程国家重点实验室, 南京 211816
  • 收稿日期:2022-03-22 出版日期:2022-10-10 发布日期:2022-04-15
  • 通讯作者: 顾学红 E-mail:xhgu@njtech.edu.cn
  • 基金资助:
    国家自然科学基金(22035002);江苏省政策引导类计划(国际科技合作/港澳台科技合作): “一带一路”创新计划(BZ2020065)

Preparation of Au-CeZr/FAU Catalytic Membranes for Preferential Oxidation of CO in H2-rich Stream

WEI Lina, PENG Li, ZHU Feng, GU Pengfei, GU Xuehong()   

  1. State Key Laboratory of Materials?Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China
  • Received:2022-03-22 Online:2022-10-10 Published:2022-04-15
  • Contact: GU Xuehong E-mail:xhgu@njtech.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22035002);Jiangsu Provincial Policy Guidance Project(International/ Hongkong, Macau and Taiwan Cooperation of Science and Technology): One-Belt-One-Road Innovative Program, China(BZ2020065)

摘要:

采用浸渍法制备了一系列不同Ce/Zr掺杂比例的FAU分子筛膜, 并进一步负载纳米金, 制备了Au-CeZr/FAU催化膜. 对催化膜的微观形貌及结构进行了表征, 并对其在富氢气氛中催化CO优先氧化性能进行了研究. H2-TPR结果表明, Ce/Zr掺杂比为1∶1时制得的催化膜Au-Ce1Zr1/FAU具有最好的被还原能力, 更有利于Au的分散与还原; O2-TPD结果表明, 该样品的氧物种比其它样品上的氧物种活性更高. 更好的被还原性能和更高的氧物种活性使得制备的Au-Ce1Zr1/FAU催化膜性能最佳, 在60 ℃时CO转化率与O2选择性可以同时达到100%, 并且在经过10次热循环测试后仍然可以保持稳定的催化性能.

关键词: CO选择性氧化, 分子筛, 催化膜

Abstract:

A series of CeZr/FAU zeolite membranes with different Ce/Zr doping ratios was prepared by impregnation method, and further loaded with nano-gold to prepare Au-CeZr/FAU catalytic membranes. The obtained membranes were well characterized, and their catalytic performances toward the preferential oxidation of CO in H2-rich gases were studied. The H2-TPR analysis showed that the Au-Ce1Zr1/FAU membrane with Ce/Zr doping ratio of 1∶1 had the best redox ability, which benefited the dispersion and reduction of Au nanoparticles. The O2-TPD analysis suggested that this membrane also possessed more active oxygen species. As a result, the Au-Ce1Zr1/FAU catalytic membrane exhibited the best catalytic activity for CO-PROX reaction with 100% CO conversion and 100% O2 selectivity at low temperature of 60 ℃ as well as high stability for 10 thermal cycling tests.

Key words: CO preferential oxidation, Zeolite, Catalytic membrane

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