Promoting effect of MgO addition to Pt/Ni/CeO2/Al2O3 in the steam gasification of biomass

Kazuya Nakamura, Tomohisa Miyazawa, Takuya Sakurai, Toshihiro Miyao, Shuichi Naito, Noorjahan Begum, Kimio Kunimori, Keiichi Tomishige

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

Pt/Ni/CeO2/Al2O3 catalyst showed the high performance in the steam gasification of cedar wood at the initial stage, however, the catalyst was deactivated within 2 h. According to the catalyst characterization by means of XRD and Ni K-edge EXAFS, it is found that aggregation of Ni metal particles causes the deactivation. In contrast, the Pt/Ni/CeO2/MgO/Al2O3 showed the high catalytic activity and stability. The addition of MgO to Pt/Ni/CeO2/Al2O3 decreased the reduction degree of Ni, but increased the dispersion of the Ni metal particles. As a result, the activity of Pt/Ni/CeO2/MgO/Al2O3 was comparable to that of Pt/Ni/CeO2/Al2O3. The Pt/Ni/CeO2/MgO/Al2O3 had high resistance to the aggregation, which can be related to high stability. Another important point is that the aggregated Ni particles on the Pt/Ni/CeO2/MgO/Al2O3 became re-dispersed by the catalyst regeneration (oxidation and reduction). The re-dispersion can proceed via the formation of the NiO-MgO solid solution by oxidation and the reduction of the NiO-MgO from the results of XRD and Ni K-edge EXAFS.

Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalApplied Catalysis B: Environmental
Volume86
Issue number1-2
DOIs
Publication statusPublished - 2009 Feb 2
Externally publishedYes

Keywords

  • Biomass
  • MgO
  • Ni
  • Re-dispersion
  • Regeneration
  • Solid solution
  • Steam gasification
  • Steam reforming
  • Synthesis gas
  • Tar

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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