Synthesis and characterization of supported metal catalysts, in-situ spectroscopic methods, reactions in organized media
Work currently in progress is focused on the development of new synthetic methods which can effectively be used in the preparation of supported metal catalysts. In particular, we have developed a new method of synthesizing supported metal catalysts with surface areas in excess of 1100 m2/g. These catalysts are being prepared using sol-gel processing. Major advantages of these catalysts over traditionally prepared supported metal catalysts by ion-exchange or impregnation methods include high mechanical stability, high resistance to sintering and deactivation, high surface areas, and superior acid properties. Variables which can affect the balance between pore size distribution and BET surface area are being studied in order to optimize metal exposure without comprising surface area. The use of metal and sulfate in promoters designed to enhance the superacid properties of zirconia are being studied using the low temperature isomerization of butane as a reaction probe. Of primary interest is the development of novel in-situ spectroscopic methods which can be used to characterize the working catalysts under reaction conditions. With this in mind, novel reactors capable of performing in-situ ultraviolet or infrared studies while simultaneously measuring reaction rates have been developed. A continuing series of studies involving non-steady state conditions is currently in progress. In particular, reaction induced surface reconstruction is under study using synchrotron radiation. In these studies, we have observed extensive lattice reconstruction during a change over from CO rich conditions to excess O2 in the catalytic oxidation of CO.
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Department of Chemical and Biomolecular Engineering, Tulane University. All Rights Reserved.