Catalytic partial oxidation of methane to synthesis gas over Ni-based catalysts. 1: Catalyst performance characteristics

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1998.2182· OSTI ID:672471

Tsipouriari, V A; Zhang, Z; Verykios, X E ^[1]

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1. Univ. of Patras (Greece). Dept. of Chemical Engineering

The catalytic partial oxidation of methane to synthesis gas was studied over various Ni-based catalysts. It was found that, in contrast to conventional Ni catalysts which show continuous deactivation with time on stream, the Ni/La{sub 2}O{sub 3} catalyst exhibits good activity and excellent stability, using the stoichiometric ratio of CH{sub 4}/O{sub 2} (=2). Kinetic results indicate that the reaction over the Ni/La{sub 2}O{sub 3} catalyst follows mainly the sequence of total oxidation to CO{sub 2} and H{sub 2}O, followed by reforming reactions to synthesis gas, while CO formation via the direct route is observed at very low oxygen partial pressures. Chemisorption and FTIR studies show that the enhanced stability of the Ni/La{sub 2}O{sub 3} catalyst is related to decoration of the Ni crystallites with lanthanum species, primarily oxycarbonates, which favor removal of excess carbon deposition and impart the catalyst its stability characteristics.

• OSTI ID: 672471
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 179; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
10 SYNTHETIC FUELS
CATALYSTS
CATALYTIC EFFECTS
LANTHANUM OXIDES
METHANE
NICKEL
PARTIAL OXIDATION PROCESSES
PERFORMANCE
STABILITY
SYNTHESIS GAS