Improved catalytic activity over P-doped ceria-zirconia-alumina supported palladium catalysts for methane oxidation

摘要

A series of Pd/xP-CZA catalysts were prepared to investigate the impacts of phosphorus on the structures and catalytic activity. It was found that increasing the amount of phosphorus incorporation leads to the transformation of CexZr1-xO2 phase into ZrO2 and CePO4 at high temperature by the reaction of P species with CexZr1-xO2 composites, which induces the declined reducibility. The addition of phosphorus effectively adjusts the surface Pd2+/(Pd2+ + Pd-0) ratios and generates larger Pd particle sizes, synergistically promoting catalytic oxidation of methane.