Promotion of oxidation and reduction of Rh species by interaction of Rh and CeO2 over Rh/CeO2/SiO2

Tomohisa Miyazawa; Kazu Okumura; Kimio Kunimori; Keiichi Tomishige

doi:10.1021/jp076385q

Promotion of oxidation and reduction of Rh species by interaction of Rh and CeO₂ over Rh/CeO₂/SiO₂

Tomohisa Miyazawa, Kazu Okumura, Kimio Kunimori, Keiichi Tomishige

ENG - Applied Chemistry

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Oxidation and reduction of Rh species on Rh/CeO₂/SiO₂ catalyst were promoted by the presence of CeO₂ as indicated from the comparison of the profiles of the temperature-programmed oxidation (TPO) and reduction (TPR) of Rh/CeO₂/SiO₂ and Rh/SiO₂. In situ quick scanning X-ray absorption fine structure (QXAFS) during the TPO and TPR indicates that the formation of the Rh-O-Ce bond was followed by that of Rh-O-Rh during the TPO, and that the Rh-O-Ce bond dissociated more easily than the Rh-O-Rh bond during the TPR. These behaviors can explain the promoting effect of CeO₂ on the oxidation and reduction of Rh species on _Rh/Ce02/Si02. In addition, it is found that the addition of CeO ₂ to Rh/SiO₂ enhanced the catalytic activity in the partial oxidation of tar from cellulose pyrolysis in the fluidized bed reactor and in the combustion of the methane. The promoting effect of CeO₂ on the catalytic performance is related to the interaction between Rh species and CeO₂.

Original language	English
Pages (from-to)	2574-2583
Number of pages	10
Journal	Journal of Physical Chemistry C
Volume	112
Issue number	7
DOIs	https://doi.org/10.1021/jp076385q
Publication status	Published - 2008 Feb 21

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title = "Promotion of oxidation and reduction of Rh species by interaction of Rh and CeO2 over Rh/CeO2/SiO2",

abstract = "Oxidation and reduction of Rh species on Rh/CeO2/SiO2 catalyst were promoted by the presence of CeO2 as indicated from the comparison of the profiles of the temperature-programmed oxidation (TPO) and reduction (TPR) of Rh/CeO2/SiO2 and Rh/SiO2. In situ quick scanning X-ray absorption fine structure (QXAFS) during the TPO and TPR indicates that the formation of the Rh-O-Ce bond was followed by that of Rh-O-Rh during the TPO, and that the Rh-O-Ce bond dissociated more easily than the Rh-O-Rh bond during the TPR. These behaviors can explain the promoting effect of CeO2 on the oxidation and reduction of Rh species on Rh/Ce02/Si02. In addition, it is found that the addition of CeO 2 to Rh/SiO2 enhanced the catalytic activity in the partial oxidation of tar from cellulose pyrolysis in the fluidized bed reactor and in the combustion of the methane. The promoting effect of CeO2 on the catalytic performance is related to the interaction between Rh species and CeO2.",

author = "Tomohisa Miyazawa and Kazu Okumura and Kimio Kunimori and Keiichi Tomishige",

year = "2008",

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doi = "10.1021/jp076385q",

language = "English",

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T1 - Promotion of oxidation and reduction of Rh species by interaction of Rh and CeO2 over Rh/CeO2/SiO2

AU - Miyazawa, Tomohisa

AU - Okumura, Kazu

AU - Kunimori, Kimio

AU - Tomishige, Keiichi

PY - 2008/2/21

Y1 - 2008/2/21

N2 - Oxidation and reduction of Rh species on Rh/CeO2/SiO2 catalyst were promoted by the presence of CeO2 as indicated from the comparison of the profiles of the temperature-programmed oxidation (TPO) and reduction (TPR) of Rh/CeO2/SiO2 and Rh/SiO2. In situ quick scanning X-ray absorption fine structure (QXAFS) during the TPO and TPR indicates that the formation of the Rh-O-Ce bond was followed by that of Rh-O-Rh during the TPO, and that the Rh-O-Ce bond dissociated more easily than the Rh-O-Rh bond during the TPR. These behaviors can explain the promoting effect of CeO2 on the oxidation and reduction of Rh species on Rh/Ce02/Si02. In addition, it is found that the addition of CeO 2 to Rh/SiO2 enhanced the catalytic activity in the partial oxidation of tar from cellulose pyrolysis in the fluidized bed reactor and in the combustion of the methane. The promoting effect of CeO2 on the catalytic performance is related to the interaction between Rh species and CeO2.

AB - Oxidation and reduction of Rh species on Rh/CeO2/SiO2 catalyst were promoted by the presence of CeO2 as indicated from the comparison of the profiles of the temperature-programmed oxidation (TPO) and reduction (TPR) of Rh/CeO2/SiO2 and Rh/SiO2. In situ quick scanning X-ray absorption fine structure (QXAFS) during the TPO and TPR indicates that the formation of the Rh-O-Ce bond was followed by that of Rh-O-Rh during the TPO, and that the Rh-O-Ce bond dissociated more easily than the Rh-O-Rh bond during the TPR. These behaviors can explain the promoting effect of CeO2 on the oxidation and reduction of Rh species on Rh/Ce02/Si02. In addition, it is found that the addition of CeO 2 to Rh/SiO2 enhanced the catalytic activity in the partial oxidation of tar from cellulose pyrolysis in the fluidized bed reactor and in the combustion of the methane. The promoting effect of CeO2 on the catalytic performance is related to the interaction between Rh species and CeO2.

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JO - Journal of Physical Chemistry C

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IS - 7

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Promotion of oxidation and reduction of Rh species by interaction of Rh and CeO₂ over Rh/CeO₂/SiO₂

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