Properties of CeO2-ZrO2 Solid Solution Supported on Si-Modified Alumina and Its Application in Pd Catalyst for Methane Combustion

CeO2-ZrO2 solid solution was supported on Si-modified alumina (Ce-Zr-O/Si-Al2O3) by the reverse microemulsion method. Its structure, thermal stability, and oxygen release capacity were studied by N2 adsorption, XRD, TPR, Raman spectroscopy, and XPS. The crystalline phase of Ce-Zr-O on Si-Al2O3 was the same as that of unsupported CeO2-ZrO2 (Ce-Zr-O), but its thermal stability, oxygen re-lease capacity at low temperature, and total oxygen storage capacity were higher. As the support of a Pd catalyst for methane combustion, Ce-Zr-O/Si-Al2O3 had better properties than Ce-Zr-O, Si-Al2O3, and the mixture of Ce-Zr-O + Si-Al2O3. Using the 0.2%Pd/10%Ce-Zr-O/Si-Al2O3 catalyst, T90 for methane combustion was only 345°C, which was 175°C lower than that of Pd supported on other supports.