Journal
JOURNAL OF CATALYSIS
Volume 204, Issue 2, Pages 498-511Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcat.2001.3398
Keywords
reforming; methane; zirconia-alumina; platinum
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The kinetics of CO2 reforming of methane was studied over Pt supported on Al2O3, ZrO2, and x% ZrO2/Al2O3 (1 less than or equal to x less than or equal to 20 wt%), and the catalysts were characterized using different techniques. The influence of the support on the catalyst activity and carbon deposition resistivity was markedly different in each case. Although the Pt/Al2O3 catalyst deactivated significantly within 20 h onstream at 1073 K, zirconia-containing catalysts exhibited much higher stability even after 60 h onstream. Thermogravimetric analysis results showed that the amount of carbon on Pt/Al2O3 is much larger than on Pt/ZrO2. Temperature-programmed reduction, CO chemisorption, and Fourier transform infrared of CO results provided evidence of metal-support interactions on zirconia-containing catalysts, indicating that the suppression of carbon deposition over these systems is probably due to Pt-Zrn+ interactions. A reaction mechanism was proposed involving two different pathways: CH4 decomposition on metal particles and CO2 activation on the support. A kinetic model based on this dual mechanism successfully correlated the experimental data. (C) 2001 Elsevier Science.
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