Rh/MgO/Ce0.5Zr0.5O2 supported catalyst for autothermal reforming of methane

The effects of ceria-zirconia doping

Zhongshan Yuan, Changjun Ni, Chunxi Zhang, Diannan Gao, Shudong Wang, Yuming Xie, Akira Okada

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The supported Rh/MgO/Ce0.5Zr0.5O2 catalysts were developed for autothermal reforming of methane. The effects of ceria-zirconia addition on the Rh catalyst were characterized with BET, XRD, SAED, HREM and TPR. The catalytic performance was evaluated on a flow through reactor. Results showed that the addition of ceria-zirconia enhanced the catalyst stability due to the interactions between ceria-zirconia, MgO promoter and the active component Rh. Meanwhile, the selectivity towards hydrogen in reformate was also boosted because of the increased water gas shift activity by the mixed oxides. The results also showed that the structural properties, the textural properties and the redox properties of ceria-zirconia had great influences on the catalyst performance, especially on the catalyst stability. Formations of single phase solid solution, larger pore size as well as Ce/Zr ratio at 1/1 were more desirable for ceria-zirconia dopant. As a result, one of the optimized honeycomb catalysts with the composition of 0.3% Rh/2.5% MgO/43.2% Ce0.5Zr0.5O2/54.0% cordierite (wt.%) has been continually operated at 800 °C up to 2000 h without deactivation.

Original languageEnglish
Pages (from-to)124-131
Number of pages8
JournalCatalysis Today
Volume146
Issue number1-2
DOIs
Publication statusPublished - Aug 15 2009
Externally publishedYes

Fingerprint

Cerium compounds
Methane
Reforming reactions
Catalyst supports
Zirconia
Doping (additives)
Catalysts
Water gas shift
High resolution electron microscopy
Oxides
Pore size
zirconium oxide
Structural properties
Hydrogen
Solid solutions
Chemical analysis

Keywords

  • Ceria-zirconia
  • Methane autothermal reforming
  • Supported Rh/MgO/CeZrO catalyst

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Rh/MgO/Ce0.5Zr0.5O2 supported catalyst for autothermal reforming of methane : The effects of ceria-zirconia doping. / Yuan, Zhongshan; Ni, Changjun; Zhang, Chunxi; Gao, Diannan; Wang, Shudong; Xie, Yuming; Okada, Akira.

In: Catalysis Today, Vol. 146, No. 1-2, 15.08.2009, p. 124-131.

Research output: Contribution to journalArticle

Yuan, Zhongshan ; Ni, Changjun ; Zhang, Chunxi ; Gao, Diannan ; Wang, Shudong ; Xie, Yuming ; Okada, Akira. / Rh/MgO/Ce0.5Zr0.5O2 supported catalyst for autothermal reforming of methane : The effects of ceria-zirconia doping. In: Catalysis Today. 2009 ; Vol. 146, No. 1-2. pp. 124-131.
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AB - The supported Rh/MgO/Ce0.5Zr0.5O2 catalysts were developed for autothermal reforming of methane. The effects of ceria-zirconia addition on the Rh catalyst were characterized with BET, XRD, SAED, HREM and TPR. The catalytic performance was evaluated on a flow through reactor. Results showed that the addition of ceria-zirconia enhanced the catalyst stability due to the interactions between ceria-zirconia, MgO promoter and the active component Rh. Meanwhile, the selectivity towards hydrogen in reformate was also boosted because of the increased water gas shift activity by the mixed oxides. The results also showed that the structural properties, the textural properties and the redox properties of ceria-zirconia had great influences on the catalyst performance, especially on the catalyst stability. Formations of single phase solid solution, larger pore size as well as Ce/Zr ratio at 1/1 were more desirable for ceria-zirconia dopant. As a result, one of the optimized honeycomb catalysts with the composition of 0.3% Rh/2.5% MgO/43.2% Ce0.5Zr0.5O2/54.0% cordierite (wt.%) has been continually operated at 800 °C up to 2000 h without deactivation.

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