Methane steam reforming in large pore catalyst

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Eduardo L. G. Oliveira (Author) FEUP; Carlos A. Grande (Author) FEUP; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Chemical Engineering Science

Vol. 65 No. 5

Pages: 1539-1550

ISSN: 0009-2509

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 29 Citations

ISI Web of Science

Scopus - 26 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-8G0

DOI: 10.1016/j.ces.2009.10.018

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific