Kinetic Study of Selective CO Oxidation over Pt-Co-Ce/Al2O3 Catalyst in Hydrogen-Rich Streams

Authors : Göktuğ Nezihi ÖZYÖNÜM, Ayşe Nilgün Akin And Ramazan YILDIRIM

Pages : 445-453

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The kinetics of the selective CO oxidation was studied in a fixed-bed microreactor at atmospheric pressure over Pt-Co-Ce/Al2O3 catalyst, which was prepared using the incipient to wetness co-impregnation technique. Intrinsic kinetic data were obtained in the initial rate region using 8 different sets of CO and O2 concentrations, each at 2 space times, i.e. 2 catalyst loadings, at 110 °C. The kinetic models based on elementary reaction steps were constructed and tested using nonlinear regression analysis with Levenberg-Marquardt algorithm. The alternative models proposed for the similar catalytic systems in the literature were also tested. It was found that Pt-Co-Ce/Al2O3 acts as a bifunctional catalyst insert ignore into journalissuearticles values(assuming ceria and cobalt sites are identical); and the reactions proceed via a Langmuir-Hinshelwood insert ignore into journalissuearticles values(L-H); type mechanism. However, no further discrimination could be made among the models based on bifunctionality and L-H kinetics. An empirical power law model was also tested and the results were found to be quite satisfactory.
Keywords : CO oxidation, Pt Co Ce Al2O3 catalyst, kinetic study, reaction mechanism