Effect of NiO content in mesoporous NiO-Al2O3 catalysts for high pressure partial oxidation of methane to syngas

Yasukazu Kobayashi, Junpei Horiguchi, Seishiro Kobayashi, Yuichiro Yamazaki, Kohji Omata, Daisuke Nagao, Mikio Konno, Muneyoshi Yamada

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58 Citations (Scopus)

Abstract

The effect of NiO content in mesoporous NiO-Al2O3 catalysts on stability of the catalytic activity was investigated for partial oxidation of methane to syngas under the reaction conditions at 650 °C and 1 MPa over the contact time range from 0.1 to 5 ms. Mesoporous/porous NiO-Al 2O3 catalysts with a high BET surface area were prepared with NiO content of 3.7-75 wt%. From XRD patterns and TPR profiles observed in these catalysts before H2 pretreatment, the presence of strong interactions between NiO and Al2O3 was indicated, which gave relatively small NiO particles in the catalysts. As results of activity tests conducted by changing the contact time from 5 ms to lower until the catalyst lost its oxidation activity, the order of the catalyst tolerance against oxidation of nickel active species on them was: NiO(75)-Al 2O3 > NiO(40)-Al2O3 > NiO(90)-Al2O3 > NiO(11)-Al2O3. As results of long runs and TG-DTA analysis, NiO(40)-Al2O3 showed the stable activity without any carbon deposition after 24 h reaction. This is because the Ni particle size and dispersion are 5.9-7.1 nm and 10.8%, respectively, which are considered to be suitable to prevent both carbon deposition and oxidation of nickel species during reaction, while NiO(75)-Al2O3 with Ni particle size of 11.7-15.9 nm gave high carbon deposition after a long run. The Ni particle size of 10 nm was a borderline for carbon deposition under reaction conditions at 1 MPa.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalApplied Catalysis A: General
Volume395
Issue number1-2
DOIs
Publication statusPublished - 2011 Mar 15

Keywords

  • Mesoporous
  • NiO-AlO catalyst
  • Oxidative reforming of methane
  • Partial oxidation
  • Short contact time reaction
  • Syngas formation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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