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Intensifying strategy of ionic liquids for Pd-based catalysts in anthraquinone hydrogenation

机译：基于PD的催化剂在蒽醌氢化中的离子液体的加强策略

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A novel strategy was employed to prepare Pd–IL complex catalysts for the anthraquinone hydrogenation reaction, taking advantage of the ionic liquid (IL). The IL microphase provides an excellent environment for augmenting the content of Pd0 active species, since the tunable surface acidic sites by altering the IL amount can offer more metallic activity sites and change the electron density of Pd nanoparticles. With a low Pd loading amount of 0.3%(wt), the optimal Pd–4%IL catalyst exhibits a stable hydrogenation efficiency of 7.7 g L−1 and the selectivity of 99.9%, obviously superior to those of the traditional catalyst of Pd/Al2O3 (4.9 g L−1 and 96.9%). DFT calculations indicate that the addition of IL would significantly enhance the activation degree of the reactant EAQ, reduce the energy barriers of the desirable hydrogenation reaction and consequently increase the selectivity. This work offers a new perspective for the highly-efficient fabrication of IL-intensified Pd-based catalysts as well as their utilization for anthraquinone hydrogenation.
机译：采用了一种新的策略，以利用离子液体（IL）来制备PD – IL复合催化剂为蒽醌氢化反应。 IL麦粒相提供了一个极好的环境，可增强PD0活性物种的含量，因为通过更改IL量可调节的表面酸性位点可以提供更多的金属活性位点并改变PD纳米颗粒的电子密度。最佳PD – 4％IL催化剂的PD载荷量低0.3％（WT），稳定的氢化效率为7.7 g L -1，选择性为99.9％，显然优于PD/ PD/ Al2O3（4.9 G L -1和96.9％）。 DFT计算表明，IL的添加将显着提高反应物EAQ的激活程度，减少所需的氢化反应的能量屏障，从而提高选择性。这项工作为高效的IL强化基于PD的催化剂以及它们用于蒽醌氢化的利用提供了一种新的视角。

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