Promoting effect of Co addition on the catalytic partial oxidation of methane at short contact time over a Rh/MgO catalyst

Seiji Naito, Hisanori Tanaka, Shigeru Kado, Toshihiro Miyao, Shuichi Naito, Kazu Okumura, Kimio Kunimori, Keiichi Tomishige

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

In catalytic partial oxidation of methane under isothermal conditions, a 0.3 wt% Rh/MgO catalyst modified with Co at a molar ratio of Co/Rh = 1 gave greater CH4 conversion and selectivity to CO and H2 than unmodified 0.3 wt% Rh/MgO. Characterization results using temperature-programmed reduction, extended X-ray absorption fine structure, and transmission electron microscopy demonstrated alloy formation between Rh and Co. In catalytic partial oxidation of methane without N2 dilution, the Rh-Co/MgO catalyst with Co/Rh = 1 suppressed the temperature increase near the catalyst bed inlet and yielded a flat temperature profile. This behavior can be interpreted as greater selectivity in the direct partial oxidation route in the presence of gas-phase oxygen and lower activity in the steam reforming of methane in the absence of gas-phase oxygen. The better performance of Rh-Co/MgO (Co/Rh = 1) compared with Rh/MgO may result from greater methane dissociation and reduction degree during the partial oxidation of methane.

Original languageEnglish
Pages (from-to)138-146
Number of pages9
JournalJournal of Catalysis
Volume259
Issue number1
DOIs
Publication statusPublished - 2008 Oct 1

Keywords

  • Alloy
  • Catalytic partial oxidation
  • Cobalt
  • Hot spot
  • Methane
  • Rhodium
  • Thermography

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Promoting effect of Co addition on the catalytic partial oxidation of methane at short contact time over a Rh/MgO catalyst'. Together they form a unique fingerprint.

Cite this