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Experimental Evaluation and Numerical Modeling of Catalytic Activity of Ag-Fe Nanoparticles Systems Prepared by Microwave Synthesis Method for CO Oxidation

A.A. Elzatahry1,*, Hassan M. Hassan2, M. ELSayed Youssef 3
 

Abstract

 

 We report a synthesis of Ag-Fe Oxide nano powder catalyst prepared by Microwave synthesis method, which is very active for low-temperature CO oxidation. Using XRD and TEM characterization techniques, we elucidated the surface composition change during catalysis process. The XRD patterns show that particle size increased during the catalysis process as a result of particle growth due to temperature effect. The activity of the prepared catalysts was studied to obtain the effects of the catalyst composition, and the preparation method on CO oxidation at low temperature. In this paper we present a methodology for modelling of local reaction-transport processes in porous heterogeneous catalyst. The CO oxidation on a catalyst with an consideration of flow of the reactant gases over the catalyst surface, the distance between surface and flow layers have been employed in the model. The reaction takes place on the catalyst sites located on the surface and in its pores, simultaneously with the transport of gaseous reaction components. The proposed model shows the effect of mass transfer limitations on a catalytic reaction. it shows the concentration gradient through the catalyst surface and provides an explanation of low and high conversions as a factor of gas layers over catalyst surface.






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