Two kinds of palladium-only catalysts loaded mesoporous beta zeolite (Pd/beta) and alumina (Pd/Al₂O₃) have been successfully prepared by the impregnation method and characterized using nitrogen adsorption–desorption, XRD, TEM, H₂-TPR, CO₂-TPD, and XPS. Catalytic activities of the catalysts for methanol oxidation were investigated with CO coexisting. The results showed that the different support determines the metal-support interaction, thus affecting the catalytic behavior. For Pd/beta, the strong basicity and better reductive ability are beneficial for improving the reaction rate of catalytic oxidation for methanol. And the palladium species with a higher oxidation state is responsible for excellent catalytic conversion of methanol and CO resistance. Compared to Pd/Al₂O₃, the T50, T90, and ΔT on Pd/beta catalyst are 145 °C, 160 °C, and 15 °C, respectively, in the case of CO present, which decreased by 45 °C, 91 °C, and 46 °C_. So beta zeolite, as a new type of catalyst support material, has a good application prospect to meet the practical needs for emission purification of methanol-gasoline vehicles.

Graphical Abstract

中文翻译：

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载体对仅钯催化剂上甲醇氧化性能的影响

通过浸渍法成功地制备了两种负载钯的介孔β沸石（Pd /β）和氧化铝（Pd / Al ₂ O ₃）催化剂，并利用氮吸附-解吸，XRD，TEM，H ₂ -TPR进行了表征。 ，CO ₂-TPD和XPS。考察了CO共存下甲醇氧化催化剂的催化活性。结果表明，不同的载体决定了金属与载体的相互作用，从而影响了催化性能。对于Pd /β，强碱性和更好的还原能力有利于提高甲醇催化氧化的反应速率。具有较高氧化态的钯物质具有出色的甲醇催化转化性和抗CO性能。与Pd / Al ₂ O ₃相比，在存在CO的情况下，Pd /β催化剂上的T50，T90和ΔT分别为145°C，160°C和15°C，降低了45°C ，91°C和46°C _。 因此，β沸石作为一种新型的催化剂载体材料，具有很好的应用前景，可以满足甲醇汽油车尾气净化的实际需要。

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