期刊
CATALYSIS TODAY
卷 176, 期 1, 页码 336-339出版社
ELSEVIER
DOI: 10.1016/j.cattod.2010.11.069
关键词
H-2 clean-up; Water gas shift; Rh-based catalysts; CeO2 carrier; Solution synthesis; Hard template
The present paper deals with the study concerning the CO removal from reforming H-2-rich gas stream through WGS reaction over Rh-based catalysts supported on CeO2 carriers. CeO2 was prepared by two different methods: solution combustion synthesis (SCS) and hard template (HT); incipient wetness impregnation method was used to deposit the active metal on the carriers. The screening at powder level in a fixed bed micro-reactor highlighted that feeding 5% CO and 20% H2O (N-2 balance) with the HT-prepared catalyst, CO conversion started at slightly lower temperature, but CH4 outlet concentrations were higher than those of the SCS-prepared one. With a simulated reformate mixture (5% CO + 20% H2O + 11% CO2 + 40% H-2, N-2 balance), the equilibrium WGS curve was exceeded for both catalysts (for the HT-prepared catalyst, CO conversion started at lower temperature and reached 100%), due to the parasite methanation reactions of both CO and CO2, favoured by the presence of a large hydrogen concentration in the reactor. A very high CH4 outlet concentration (max 18.6%) was measured for the HT-prepared catalyst. Then, tests at different weight space velocities WSV were carried out: with the SCS-prepared catalyst the best performance was obtained by lowering WSV. (C) 2010 Elsevier B. V. All rights reserved.
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