Catalytic performance of Ru nanoparticles supported on different mesoporous silicas for preferential oxidation of CO in H2-rich atmosphere

被引：33
作者：
Wang, Li [1 ]
Chen, Jiuling [1 ]
Patel, Archana [1 ]
Rudolph, Victor [1 ]
Zhu, Zhonghua [1 ]
机构：
[1] Univ Queensland, Sch Chem Engn, Brisbane, Qld 4072, Australia
来源：
APPLIED CATALYSIS A-GENERAL | 2012年 / 447卷
基金：
澳大利亚研究理事会;
关键词：
PROX; CO2; selectivity; Ru dispersion; Mesoporous silica; RHODIUM-BASED CATALYSTS; HYDROGEN-RICH STREAM; CARBON-MONOXIDE; LOW-TEMPERATURE; GAS; EXCESS; MCM-41; H-2; RU/GAMMA-AL2O3; REDISPERSION;
D O I：
10.1016/j.apcata.2012.09.044
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ru catalysts supported on different mesoporous silicas, MCM-41, MCM-48, SBA-15 and KIT-6, were applied to the preferential oxidation of CO in a H-2-rich atmosphere (PROX). The properties of mesoporous support and the supported Ru catalysts were investigated using N-2 physisorption, FTIR, TEM. CO chemisorption, H-2-TPR and XPS. The performance of Ru catalysts in PROX highly relates to the Ru dispersion, support pore structure, Ru reducibility and the interaction between Ru and support. Ru/KIT-6 presents the highest surface activity (TOF values), owing to the easiest reducibility of Ru. Nevertheless, its poor Ru dispersion results in a low number of surface active sites, leading to the low CO conversion value over Ru/KIT-6. Ru/MCM-41 can achieve full CO conversion and the high CO2 selectivity in the reaction temperature range of 115-180 degrees C owing to the high Ru dispersion from the strong interaction between Ru and MCM-41. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：200 / 209
页数：10
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