CeO₂-coated Pd core-shell units with thin shell was synthesized and supported on mesoporous alumina via electrostatic method. The effect of high temperature pretreatment on the transformation of Pd species was investigated. The results revealed that CeO₂-coated Pd nanoparticles were highly dispersed on mesoporous alumina, resulting in a 90% CH₄ conversion at 392 °C. The catalyst pretreated at 600 ℃ was found to possess the best sintering resistance performance for CH₄ oxidation and the final combustion temperature was as low as 570 °C. During the aging process of catalyst, the formation of Ce_1-XPd_XO_2-δ solid-solution interface could effectively retard the decomposition of PdO and agglomeration of Pd species, consequently enhancing the catalytic performance of the material.

合成了具有薄壳的CeO ₂包覆的Pd核壳单元，并通过静电法将其负载在介孔氧化铝上。研究了高温预处理对Pd物种转化的影响。结果表明，CeO ₂包覆的Pd纳米颗粒高度分散在介孔氧化铝上，在392°C时CH ₄转化率为90％。经600℃预处理的催化剂具有较好的抗CH ₄氧化烧结性能，最终燃烧温度低至570℃。在催化剂的老化过程中，Ce _1-X Pd _X O2 _-δ的形成 固溶界面可以有效地阻止PdO的分解和Pd的团聚，从而提高了材料的催化性能。