Oxidation of CO in hydrogen-rich gas using a novel membrane combined with a microporous SiO2 layer and a metal-loaded γ-Al2O3 layer
Oxidation of CO in hydrogen-rich gas using a novel membrane combined with a microporous SiO2 layer and a metal-loaded γ-Al2O3 layer
复制标题
使用结合微孔 SiO2 层和负载金属的 γ-Al2O3 层的新型膜氧化富氢气体中的 CO
DOI：
10.1016/s0926-860x(01)00854-7
复制
发表时间：
2002
影响因子：
5.5
通讯作者：
S. Morooka
中科院分区：
文献类型：
--
作者：
Y. Hasegawa;A. Ueda;K. Kusakabe;S. Morooka
In order to prepare metal-loaded catalyst membranes for CO oxidation, γ-Al2O3layers were formed on porous α-Al2O3support tubes (1.7mm i.d., 2.1mm o.d.) using a sol–gel technique. The layers were then impregnated with Pt, Ru, Ni, Co and Rh, using aqueous solutions of H2PtCl6, RuCl3, Ni(NO3)2, Co(NO3)2and RhCl3, respectively, and calcined in air at 573K. A gaseous mixture of H2, CO and O2was permeated through these membranes, and their activities were determined with respect to CO oxidation at 423–523K. The CO oxidation activity was the highest for the Rh/γ-Al2O3membrane. Based on the report that the CO oxidation activity was much reduced for higher concentrations of CO than the threshold value, a membrane was developed by forming a microporous silica layer on the Rh/γ-Al2O3membrane. By the selective permeation with no feed of O2, the CO concentration of 50,000ppm on the feed side could be decreased to 610–2700ppm. When O2was added to the feed, the CO concentration was further decreased. Thus, the composite membrane, which was developed in the present study, can play dual roles: H2-selective permeation with a high H2/CO separation factor, and catalytic oxidation of CO which leaked through the microporous silica layer.
