ZSM-5 zeolites (NaZSM-5, HZSM-5 and Silicalite-1) with different acid nature were synthesized and used as supports of Pd catalysts for catalytic combustion of methane. Moreover, the acid property of the as-synthesized Pd/NaZSM-5 catalyst was adjusted by a NH₄⁺ ion-exchange process to post-generate Brønsted acid sites and different preparation methods were investigated. The potential roles of Brønsted acid sites (anchoring Pd species or activating methane molecules) were discussed, and the experimental results indicated that the anchoring effect of Brønsted acid sites on Pd species was not directly observed. However, the acid properties of supports (the presence of Al³⁺ as Lewis acid sites, especially coordinatively unsaturated Al³⁺) were crucial for the preparation of Pd/ZSM-5 catalysts with high Pd dispersion. Additionally, although Brønsted acid sites of ZSM-5 was contributed to the activation or even cracking of long-chain alkanes (such as n-decane), the direct adsorption/dissociation of methane on Brønsted acid sites was difficult and depended more on the dispersion and particle size of PdO_x. Pd/NaZSM-5 catalyst presented an outstanding durability at low-temperature (350 °C) and high-temperature (800 °C), and the high Si/Al ratio could improve the water-resistance due to its good hydrophobicity, but the reversible deactivation owing to the formation of PdO into Pd(OH)₂ under high concentration of water vapor was still unavoidable.

合成了具有不同酸性质的ZSM-5沸石（NaZSM-5，HZSM-5和Silicalite-1）并将其用作甲烷催化燃烧的Pd催化剂的载体。此外，通过NH ₄ ⁺离子交换工艺调节合成后的Pd / NaZSM-5催化剂的酸性质，以使其后生成布朗斯台德酸位，并研究了不同的制备方法。讨论了布朗斯台德酸性位点（锚定Pd物种或激活甲烷分子）的潜在作用，实验结果表明，布朗斯台德酸性位点对Pd物种的锚固作用没有被观察到。但是，载体的酸性质（存在作为路易斯酸位的Al ³⁺，特别是配位不饱和的Al ³⁺）对于制备具有高Pd分散度的Pd / ZSM-5催化剂至关重要。此外，尽管ZSM-5的布朗斯台德酸位点促进了长链烷烃（例如正癸烷）的活化甚至裂解，但是甲烷在布朗斯台德酸位点上的直接吸附/解离却很困难，并且更多地取决于分散度和PdO _x的粒径。Pd / NaZSM-5催化剂在低温（350°C）和高温（800°C）下均具有出色的耐久性，并且高Si / Al比由于具有良好的疏水性而可以提高耐水性，但Pd / NaZSM-5催化剂具有良好的疏水性。由于在高浓度的水蒸气下将PdO生成Pd（OH）₂而引起的可逆失活仍然是不可避免的。