The activity and stability of supported Pd catalysts are of crucial importance in the dehydrogenation of perhydro 2‐(n‐methylbenzyl)pyridine (H₁₂‐MBP) reported as a potential liquid organic hydrogen carrier. Because of good stability examined in many hydroprocessing reactions, carbon‐coated alumina (CCA) was chosen as a support for Pd loading and prepared by the pyrolysis of glycerol solution with different concentrations. The catalytic activity and stability of Pd/CCA catalysts exhibited a volcano‐shaped relationship with the carbon content. Various characterization results revealed that the degree of carbon coating affected the acidity, Pd loading and particle size, reactant adsorption capacity, and H₂ release at low temperatures. At an optimal carbon content (3.3 wt % in this work), these properties are believed to be balanced well, thus showing the best catalytic performance. Moreover, the improvement of catalytic activity was examined with supported Pd on carbon‐coated silica‐alumina of 3.3 wt % carbon content.

中文翻译：

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碳包覆的氧化铝负载的Pd催化剂在液态有机氢载体全氢2-（n-甲基苄基）吡啶的脱氢中的活性和稳定性得到增强

负载型Pd催化剂的活性和稳定性对于据报道是潜在的液态有机氢载体的过氢2-（n-甲基苄基）吡啶（H _12- MBP）脱氢至关重要。由于在许多加氢处理反应中都具有良好的稳定性，因此选择了碳包覆的氧化铝（CCA）作为Pd负载的载体，并通过热解不同浓度的甘油溶液制备了碳包覆的氧化铝。Pd / CCA催化剂的催化活性和稳定性与碳含量呈火山状关系。各种表征结果表明，碳涂层的程度会影响酸度，Pd的负载量和粒径，反应物的吸附能力以及H ₂的含量。在低温下释放。在最佳碳含量下（在这项工作中为3.3 wt％），这些特性被认为是很好的平衡，因此表现出最佳的催化性能。此外，在含碳量为3.3 wt％的碳包覆二氧化硅-氧化铝上负载了Pd可以检测到催化活性的提高。