Development of highly active PdO-promoted CeO2-SiO2-Bi2O3/γ-Al2O3 inorganic catalysts for methane combustion

We herein report the preparation of alpha wt%PdO/16wt%Ce(1,y)SixBiyO2-delta/gamma-Al2O3 (PdO/CS(x)Bi(y)/Al2O3) for application in the methane combustion reaction at low temperatures. The introduction of SiO2 into the CeO2 cocatalyst improved the specific surface area and acid-base properties of the catalyst to enhance its potential for application as an exhaust catalyst. In addition, the incorporation of Bi2O3 into the CeO2-SiO2 co-catalyst confirmed that the oxygen storage capacity and oxidation properties of PdO, which is known to exhibit a high oxidation capability toward methane, were enhanced for PdO/CS(x)Bi(y)/Al2O3. The highest catalytic activity was obtained for the 10wt%PdO/16wt%Ce0.85Si0.08Bi0.07/gamma-Al2O3 catalyst, which exhibited a methane conversion of 88% at 500 degrees C.