CATALYTIC REACTIONS OF CARBON MONOXIDE (CO) OVER SILICA-SUPPORTED IRIDIUM AND IRIDIUM-RUTHENIUM BIMETALLIC CATALYST

TL;DRAbstract

The oxidation of carbon monoxide has been studied over a highly dispersed silica-supported Iridium catalyst. Multiple steady-state and reaction rate hysteresis were observed. The competitive adsorption between CO and oxygen is invoked to explain the dependence of the area, under the hysteresis loop, on reaction temperature. Temperature fluctuations were observed concomitant to the self-sustained oscillations. These fluctuations are believed to drive the oscillations. The shift in the CO stretching frequency, under reaction conditions, reveals the absence of CO-islands of reactivity. The oxidation of CO and methanation reactions have also been studied over Ir-Ru bimetallic catalyst. The results of these studies suggest the existence of true bimetallic clusters having mixed metal surface sites. Metal-precursor interactions are shown to have a major role in determining the surface composition of the bimetallic clusters.

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