The influence of zeolite support materials and their impact on CH₄ oxidation activity was studied utilizing Pd supported on H-beta and H-SSZ-13. A correlation between CH₄ oxidation activity, Si/Al ratio (SAR), the type of zeolite framework, reduction-oxidation behaviour, and Pd species present was found by combining catalytic activity measurements with a variety of characterization methods (operando XAS, NH₃-TPD, SAXS, STEM and NaCl titration). Operando XAS analysis indicated that catalysts with high CH₄ oxidation activity experienced rapid transitions between metallic- and oxidized-Pd states when switching between rich and lean conditions. This behaviour was exhibited by catalysts with dispersed Pd particles. By contrast, the formation of ion-exchanged Pd²⁺ and large Pd particles appeared to have a detrimental effect on the oxidation-reduction behaviour and the conversion of CH₄. The formation of ion-exchanged Pd²⁺ and large Pd particles was limited by using a highly siliceous beta zeolite support with a low capacity for cation exchange. The same effect was also found using a small-pore SSZ-13 zeolite due to the lower mobility of Pd species. It was found that the zeolite support material should be carefully selected so that the well-dispersed Pd particles remain, and the formation of ion-exchanged Pd²⁺ is minimized.

利用负载在 H-β 和 H-SSZ-13 上的 Pd 研究了沸石载体材料的影响及其对 CH ₄氧化活性的影响。CH之间的相关性₄氧化活性，Si / Al比（SAR），沸石骨架，氧化还原行为和Pd物种存在的类型，发现通过催化活性测量与多种表征方法（operando XAS，NH组合₃ -TPD、SAXS、STEM 和 NaCl 滴定）。Operando XAS 分析表明高 CH ₄催化剂在富和贫条件之间切换时，氧化活性经历了金属和氧化 Pd 状态之间的快速转变。这种行为由具有分散 Pd 颗粒的催化剂表现出来。相比之下，离子交换的 Pd ²⁺和大 Pd 颗粒的形成似乎对氧化还原行为和 CH ₄的转化具有不利影响。离子交换 Pd ²⁺的形成大 Pd 颗粒通过使用具有低阳离子交换能力的高硅质 β 沸石载体受到限制。由于 Pd 物质的迁移率较低，使用小孔 SSZ-13 沸石也发现了相同的效果。发现应仔细选择沸石载体材料，以便保留良好分散的 Pd 颗粒，并使离子交换 Pd ²⁺的形成最小化。