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Influence of the preparation method on the performance of Rh catalysts on CeO2 for WGS reaction

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Title: Influence of the preparation method on the performance of Rh catalysts on CeO2 for WGS reaction
Authors: Galletti, C.1, Djinović, P.1,2, Specchia, S.1 stefania.specchia@polito.it, Batista, J.2, Levec, J.2, Pintar, A.3, Specchia, V.1
Source: Catalysis Today. Nov2011, Vol. 176 Issue 1, p336-339. 4p.
Subjects: Rhodium catalysts, Catalytic reforming, Cerium oxides, Chemical reactions, Carbon monoxide, Catalyst supports, Self-propagating high-temperature synthesis, Water-gas, Mixtures
Abstract: Abstract: The present paper deals with the study concerning the CO removal from reforming H2-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 (N2 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% H2, N2 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. [Copyright &y& Elsevier]
Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Influence of the preparation method on the performance of Rh catalysts on CeO<subscript>2</subscript> for WGS reaction
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  Data: Abstract: The present paper deals with the study concerning the CO removal from reforming H2-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 (N2 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% H2, N2 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. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Catalysis Today is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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