Pulse study on the partial oxidation of methane over Ni/θ-Al2O3 catalyst

Zhong Wen Liu, Ki Won Jun, Hyun Seog Roh, Seung Chan Baek, Sang Eon Park

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26 Citations (Scopus)

Abstract

Pulse reactions of CH4, O2 and mixed gas (CH4/O2 = 2) over fresh, partially reduced and well reduced Ni/θ-Al2O3 catalysts have been carried out at 923 and 1023 K to study the mechanism of CH4 activation and the catalytic partial oxidation of CH4. The fresh catalyst showed high activity for the dissociation of CH4, and CO rather than CO2 was the main carbon-containing gaseous product while H2 being detected for the first CH4 pulse, suggesting that CH4 can be partially oxidized to CO and H2 by the lattice oxygen of NiO. The bond strength of Ni-O seems to be favorable to the partial oxidation of CH4, which is due to the strong interaction between NiO and θ-Al2O3. The results of CH4/O2 pulses indicate that both metallic nickel and NiOx (x < 1.0) are active phases for partial oxidation of CH4. It has been demonstrated that both the reaction temperature and the C/O ratio are critical to the selectivities to CO and CO2. The mechanisms of the oxidation of CH4 over fresh and reduced catalysts have been proposed.

Original languageEnglish
Pages (from-to)283-293
Number of pages11
JournalJournal of Molecular Catalysis A: Chemical
Volume189
Issue number2
DOIs
Publication statusPublished - 2002 Oct 24

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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