Bimetallic Pd-Ir catalysts based on halogen free precursors supported on alumina and La-stabilized alumina were prepared and characterized. The influence of iridium co-metal loading on activity of supported palladium catalysts in CO and C 3 H 6 oxidation was studied. In addition, the effect of thermal aging on the catalytic activity was discussed. The powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy combined with energy dispersive X-ray spectroscopy, thermogravimetric analysis were used for characterization of the catalysts. The catalytic activity of prepared catalysts was determined based on conversion of CO and C 3 H 6 under stoichiometric condition. The activity tests showed that bimetallic catalyst with Pd:Ir molar ratio of 1.00:0.18 on both support materials has the lowest light-off temperature difference between the fresh and aged catalysts in CO and C 3 H 6 oxidation. However, high Ir loading improved the activity of the catalysts only, if La-stabilized aluminum oxide was used as a support material. Lanthanum oxide promoted the activity of the fresh catalysts in CO and C 3 H 6 oxidation. Overall, Ir is a promising co-metal candidate for Pd-based catalyst for improving CO and C 3 H 6 oxidation activity of the catalyst under stoichiometric conditions.
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