The Role of Support in Methane Reforming with CO2 over Rhodium Catalysts

Junji Nakamura; Keita Aikawa; Koichi Sato; Toshio Uchijima

doi:10.1016/S0167-2991(08)61865-0

The Role of Support in Methane Reforming with CO₂ over Rhodium Catalysts

Junji Nakamura, Keita Aikawa, Koichi Sato, Toshio Uchijima

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

7 Citations (Scopus)

Abstract

The catalytic activity of Rh/SiO₂ for reforming of CH₄ with CO₂ was promoted by mixing physically with Al₂O₃, MgO, TiO₂, K/SiO₂. The order in P_co2 and P_ch4 for CH₄ + CO₂ reaction over Rh/SiO₂ were unity and - 0.6, respectively, indicating that CO₂ dissociation was the rate-limiting step which was promoted by the mixing of metal oxides. In-situ FT-IR studies showed that dominant species formed by exposing Rh/SiO₂ + Al₂O₃ to CO₂ + H₂ was formate at high temperatures above 400 K. The promotion in the activity of Rh/SiO₂ by mixing with the metal oxides is ascribed to the rise of CO₂ concentration in the vicinity of Rh particles, where CO₂ is trapped as carbonate and/or formate on the surface of the metal oxides. The basic property of metal oxide surface may be responsible for the activity of CO₂ dissociation.

Original language	English
Pages (from-to)	495-500
Number of pages	6
Journal	Studies in Surface Science and Catalysis
Volume	90
Issue number	C
DOIs	https://doi.org/10.1016/S0167-2991(08)61865-0
Publication status	Published - Jan 1 1994
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Condensed Matter Physics
Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/S0167-2991(08)61865-0

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title = "The Role of Support in Methane Reforming with CO2 over Rhodium Catalysts",

abstract = "The catalytic activity of Rh/SiO2 for reforming of CH4 with CO2 was promoted by mixing physically with Al2O3, MgO, TiO2, K/SiO2. The order in Pco2 and Pch4 for CH4 + CO2 reaction over Rh/SiO2 were unity and - 0.6, respectively, indicating that CO2 dissociation was the rate-limiting step which was promoted by the mixing of metal oxides. In-situ FT-IR studies showed that dominant species formed by exposing Rh/SiO2 + Al2O3 to CO2 + H2 was formate at high temperatures above 400 K. The promotion in the activity of Rh/SiO2 by mixing with the metal oxides is ascribed to the rise of CO2 concentration in the vicinity of Rh particles, where CO2 is trapped as carbonate and/or formate on the surface of the metal oxides. The basic property of metal oxide surface may be responsible for the activity of CO2 dissociation.",

author = "Junji Nakamura and Keita Aikawa and Koichi Sato and Toshio Uchijima",

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AU - Nakamura, Junji

AU - Aikawa, Keita

AU - Sato, Koichi

AU - Uchijima, Toshio

PY - 1994/1/1

Y1 - 1994/1/1

N2 - The catalytic activity of Rh/SiO2 for reforming of CH4 with CO2 was promoted by mixing physically with Al2O3, MgO, TiO2, K/SiO2. The order in Pco2 and Pch4 for CH4 + CO2 reaction over Rh/SiO2 were unity and - 0.6, respectively, indicating that CO2 dissociation was the rate-limiting step which was promoted by the mixing of metal oxides. In-situ FT-IR studies showed that dominant species formed by exposing Rh/SiO2 + Al2O3 to CO2 + H2 was formate at high temperatures above 400 K. The promotion in the activity of Rh/SiO2 by mixing with the metal oxides is ascribed to the rise of CO2 concentration in the vicinity of Rh particles, where CO2 is trapped as carbonate and/or formate on the surface of the metal oxides. The basic property of metal oxide surface may be responsible for the activity of CO2 dissociation.

AB - The catalytic activity of Rh/SiO2 for reforming of CH4 with CO2 was promoted by mixing physically with Al2O3, MgO, TiO2, K/SiO2. The order in Pco2 and Pch4 for CH4 + CO2 reaction over Rh/SiO2 were unity and - 0.6, respectively, indicating that CO2 dissociation was the rate-limiting step which was promoted by the mixing of metal oxides. In-situ FT-IR studies showed that dominant species formed by exposing Rh/SiO2 + Al2O3 to CO2 + H2 was formate at high temperatures above 400 K. The promotion in the activity of Rh/SiO2 by mixing with the metal oxides is ascribed to the rise of CO2 concentration in the vicinity of Rh particles, where CO2 is trapped as carbonate and/or formate on the surface of the metal oxides. The basic property of metal oxide surface may be responsible for the activity of CO2 dissociation.

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ER -

The Role of Support in Methane Reforming with CO₂ over Rhodium Catalysts

Abstract

All Science Journal Classification (ASJC) codes

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