Methane steam reforming in large pore catalyst

Eduardo L.G. Oliveira, Carlos A. Grande, Alírio E. Rodrigues

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


In this work we have studied the performance of catalyst extrudates of Ni-Al2O3 promoted with potassium for steam methane reforming. The most interesting property of this catalyst is the presence of large pores (average diameter of 8×10-4 m) to reduce diffusional limitations. We have determined the true kinetics using catalyst powder in the temperature range covering 757-804 K. Furthermore, experiments using a fixed bed filled with extrudates were performed in the temperature range covering 701-800 K at constant methane/steam ratio for different feed flowrates. In the true kinetic experiments using catalyst powder it was observed that this catalyst has a very high CO2 selectivity against CO. The conversion of the catalyst is smaller than other commercial materials due to the smaller content of Ni (10%). Experiments using catalyst extrudates showed that the reaction suffers from strong mass and heat limitations: diffusion of reactants/products and heat transfer in the gas/solid interface. The presence of large pores has an important contribution in decreasing the resistance to mass transfer in particles with 1.1×10-2 m diameter. At 800 K and 2 bar the effectiveness factor was about 0.43 for the steam methane reforming reaction and 0.41 for the global reaction. © 2009 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)1539-1550
Number of pages12
JournalChemical Engineering Science
Issue number5
StatePublished - Jan 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry
  • Applied Mathematics
  • Industrial and Manufacturing Engineering


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