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  

Preparation of Au-CeZr/FAU Catalytic Membranes for Preferential Oxidation of CO in H_(2)-rich Stream

作　　者：魏李娜 彭莉 朱锋 顾鹏飞 顾学红 WEI Lina;PENG Li;ZHU Feng;GU Pengfei;GU Xuehong(State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[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

出　　处：《高等学校化学学报》2022年第10期61-68,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号: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(批准号:BZ2020065)资助。

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.H_(2)-TPR结果表明,Ce/Zr掺杂比为1∶1时制得的催化膜Au-Ce_(1)Zr_(1)/FAU具有最好的被还原能力,更有利于Au的分散与还原;O_(2)-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-Ce_(1)Zr_(1)/FAU催化膜性能最佳,在60℃时CO转化率与O_(2)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.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 H_(2)-rich gases were studied.The H_(2)-TPR analysis showed that the Au-Ce_(1)Zr_(1)/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 O_(2)-TPD analysis suggested that this membrane also possessed more active oxygen species.As a result,the Au-Ce_(1)Zr_(1)/FAU catalytic membrane exhibited the best catalytic activity for CO-PROX reaction with 100%CO conversion and 100%O_(2) selectivity at low temperature of 60℃as well as high stability for 10 thermal cycling tests.

关 键 词：CO选择性氧化 分子筛 催化膜 

分 类 号：O611.4[理学—无机化学]