Kinetic study of methane CO2 reforming on Co-Ni/Al 2O3 and Ce-Co-Ni/Al2O3 catalysts

Say Yei Foo, Chin Kui Cheng, Tuan Huy Nguyen, Adesoji A. Adesina

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

The performance of Ce-promoted and undoped 5Co-15Ni/Al2O 3 catalysts for the dry reforming of CH4 has been investigated in a fixed-bed reactor. Although addition of Ce (2.5 wt%) significantly reduced carbon deposition by up to 50%, there was neither marked improvement in CH4 reaction rate (<5% increase) nor a significant change in activation energy. The increased carbon resistance of the Ce-promoted catalyst was attributed to equilibrium between stable multiple oxidation states of the Ce ion during the reaction. TPR-TPO of used catalysts revealed the existence of two types of carbon species-reactive Cα which is easily gasified by H2 and also participates in redox reactions with cerium oxides, and a relatively non-reactive Cβ which is only removed by O2 and does not participate in the redox cycle. A dual-site Langmuir-Hinshelwood mechanism for the reaction was also proposed.

Original languageBritish English
Pages (from-to)221-226
Number of pages6
JournalCatalysis Today
Volume164
Issue number1
DOIs
StatePublished - 30 Apr 2011

Keywords

  • Cerium promoter
  • CO reforming of CH
  • Cobalt-nickel catalyst
  • Kinetic analysis

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