Study of the methane combustion and TPR/TPO properties of Pd/Ce-Zr-M/Al2O3 catalysts with MÂ =Â Mg, Ca, Sr, Ba

The effects of alkaline earths (Mg, Ca, Sr and Ba) addition to Pd/Ce-Zr/Al2O3 catalyst on methane combustion behavior have been investigated. The addition of Ca to Pd/Ce-Zr/Al2O3 inhibits the site growth and decomposition of PdO particles and improves the reduction-reoxidation properties of the active PdO species, which increases the catalytic activity and thermal stability of the Pd/Ce-Zr/Al2O3 catalyst.