Highly Dispersed Pd Species Supported on CeO2 Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

The correlation between the occurrence state of surface Pd species Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized highly active 0.5% PdO/CeO2-RE catalyst, in which nanoparticles are evenly dispersed on CeO2 nanorods CeO2-R. Based comprehensive characterization, revealed that uniformly with particle size distribution 2.3 ± 0.6 nm responsible generation PdO and PdxCe1−xO2−δ phase –Pd2+–O2−–Ce4+– linkage, can easily provide oxygen vacancies facilitate transfer reactive CeO2-R species. As consequence, remarkable catalytic activity Pd/CeO2-RE related to high concentration catalyst synergistic interaction nanorod.