Microkinetic Modeling of CO Oxidation on Ionic Palladium-Substituted Ceria

Mandapaka, Ravi Kiran and Madras, Giridhar (2016) Microkinetic Modeling of CO Oxidation on Ionic Palladium-Substituted Ceria. In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 55 (8). pp. 2309-2318.

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Abstract

This study presents a plausible dual-site mechanism and microkinetic model for CO oxidation over palladium-substituted ceria incorporating the theoretical oxygen storage capacity of different-catalysts into the kinetic model. A rate expression without prior assumption of rate-determining steps has been developed for the proposed microkinetic model using reaction route analysis. Experiments were conducted using various percentages of palladium in ceria that were synthesized by solution combustion. Obtained catalysts were characterized by X-ray diffraction, X-ray photoelectron spectra, and Brunauer-Emmett-Teller surface area measurements. A detailed mechanism was, developed, and the kinetic parameters and rate expression were validated with the conversion data obtained in the presence of the catalysts. Furthermore, a reduced rate expression based on rate-determining step and most abundant reactive intermediate approximation was obtained and tested against the original rate expression for different experimental conditions. From the results obtained it was concluded that the simulated rate predictions matched the experimental trend with reasonable accuracy, validating the kinetic parameters proposed it this study.

Item Type:	Journal Article
Publication:	INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	07 Apr 2016 05:53
Last Modified:	07 Apr 2016 05:53
URI:	http://eprints.iisc.ac.in/id/eprint/53611

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