负载型Ru／γ-Al2O3催化剂上富氢气体中CO选择性氧化去除研究  

Removal of carbon monoxide in excess hydrogen over Ru/γ-Al_2O_3 supported catalysts

作　　者：陈喜蓉[1] 邹汉波[2] 陈胜洲[2] 董新法[1] 林维明[1] 

机构地区：[1]华南理工大学化工与能源学院,广东广州510006 [2]广州大学化学与化工学院,广东广州510006

出　　处：《应用化工》2008年第2期135-139,共5页Applied Chemical Industry

基　　金：国家自然科学基金(20576023);广东省自然科学基金(06025660)

摘　　要：实验研究了以浸渍法制备的负载型Ru／γ-Al2O3催化剂体系上富氢气体中CO选择性氧化性能，考察了各反应工艺条件包括催化剂中贵金属的担载量、反应原料气中O2／CO的比、CO2和H2O的存在等因素对Ru／γ-Al2O3催化剂上CO选择性氧化活性的影响，采用H2-TPR和XRD手段对催化剂进行检测。研究发现，钌担载量为1％Ru／A120，在170—190℃具有很好的CO选择性氧化活性。O2／CO比值升高，提高了CO转化率的同时存在着更多的氢气消耗，氢气的竞争氧化对CO的氧化反应起了一定的抑制作用，CO2的存在对催化剂的性能起着抑制作用，而水的存在对CO去除反应有促进作用。The Ru/γ-Al2O3 catalysts with difference Ru-loading were prepared via incipient impregnation method,and the preferential oxidation of CO in the hydrogen-rich gas （ PROX reaction ） has been examined over Al2O3 -supported Ru catalysts. The effects of various parameters, such as Ru-loading, the ratio of O2/CO, in presence or not with H2O and CO2, on structure and performance were investigated and catalysts were measured through the H2-TPR, XRD. It is shown that 1.0% Ru-loading was suitable to remove CO in the mixture gases below 100×10^-6 at 170 - 190℃. When raising the temperature,the CO conversion and the hydrogen consumption over the catalysts increased, so reducing CO selectivity of the catalysts. The carbon dioxide in hydrogen-rich gas played an inhibiting role in CO oxidation on the catalysts, but the presence of H2O is suitable to the removal of CO.

关 键 词：富氢气体 钌催化剂 一氧化碳去除 选择性氧化 

分 类 号：O643[理学—物理化学]