A comparative study on the kinetics of carbon dioxide reforming of methane over Pt-Ni/Al2O3 catalyst: Effect of Pt/Ni Ratio
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Science Sa
Access Rights
info:eu-repo/semantics/closedAccess
Abstract
Kinetics and surface reaction mechanism of CO2 reforming of methane (CDRM) was studied over 0.2%Pt-15%Ni/Al2O3 and 0.3%Pt-10%Ni/Al2O3 catalysts in order to determine the effect of Ni/Pt loading ratio on kinetic behavior. The simple power-law type rate expressions obtained for 0.3%Pt-10%Ni/Al2O3 and 0.2%Pt-15%Ni/Al2O3 have reaction orders of 1 and 1.09 for CH4 and 0.87 and 1.40 for CO2, respectively, confirming methane consumption rate for 0.2%Pt-15%Ni/Al2O3 sample is more sensitive to the increase in partial pressure of CO. The comparative analysis of meaningful surface reaction models for the catalysts and the optimized model parameters obtained revealed that the surface reaction mechanisms are completely different CO inhibition effect is stronger and CO2 utilization is suppressed on the catalyst with high Ni:Pt loading ratio. On the other hand, with a decrease in Ni:Pt loading ratio, CH4 adsorption becomes weaker, ability of utilizing CO2 as the oxygen source gets stronger and CO inhibition effect is practically eliminated. (C) 2012 Elsevier B.V. All rights reserved.
Description
Keywords
Pt-Ni catalysts, Dry reforming of methane, Kinetics, CO2 reforming of methane, Synthesis gas
Journal or Series
Chemical Engineering Journal
WoS Q Value
Q1
Scopus Q Value
Q1
Volume
215
