PdCo/SiO₂ 双金属催化剂用于杂环储氢载体的高效脱氢

N-Ethylcarbazole/dodecahydro-N-ethylcarbazole (NECZ/12H-NECZ) system was regarded as a promising hydrogen storage solution in the liquid organic hydrogen carriers (LOHC) filed. However, the design and development of high activity and selectivity dehydrogenation catalysts still chocked off the industrial application of NECZ/12H-NECZ system. Aiming to improve H₂ release efficiency of 12H-NECZ, bimetal catalyst Pd₁Co₃/SiO₂ (Pd content: 1.25%(mass)) with high dehydrogenation activity and high dehydrogenation selectivity was synthesized in this work. The structure properties were characterized by XPS, XRD and HRTEM. And its catalytic performance was evaluated in the dehydrogenation reaction of 12H-NECZ. Compared with commercial 5.0%(mass) Pd/SiO₂, it was indicated that the formation of PdCo alloy by the introducing of metal Co facilitated the dehydrogenation efficiency of 12H-NECZ and selectivity of NECZ. Both the reaction kinetics results and DFT calculation analyses showed the obvious decreasing of energy barriers of three elementary reactions by employing bimetal catalyst. Especially in the 2ndelementary reaction (8H-NECZ to 4H-NECZ), its efficiency was boosted a lot. The research content in this paper provides new ideas for revealing the mechanism of 12H-NECZ dehydrogenation reaction and designing and developing efficient catalysts for dehydrogenation reaction.