Abstract Mesoporous alumina (meso-Al2O3) supported noble metal catalysts have been widely used in heterogeneous catalysis. However, these catalysts are generally prepared via wet chemistry, which suffers from several drawbacks, such as: excessive use of solvents and time-consuming drying process. In this manuscript, a mechanochemical method for solid-state processing between aluminum isopropoxide and block copolymers (P123) were introduced to synthesize meso-Al2O3 supported platinum catalyst (Pt/m-Al2O3). The resulting Pt-meso-Al2O3 catalyst shows high surface area (up to 465 m2/g) and uniform pore size (~3.9 nm). Interestingly, the solvent-free ball milling method enables the processing of bulky micrometer-scale Pt precursors into well dispersed Pt nanoparticles (~4.8 nm). Moreover, Pt/m-Al2O3 catalyst affords good performance in the selective hydrogenation of nitrobenzene to aniline (Conversion: >99%, Aniline Selectivity: >99%). This mechanochemical route provides a solvent-free and one-step method for synthesizing meso-Al2O3 supported noble metal catalysts.

中文翻译：

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通过机械化学无溶剂合成介孔铂铝氧化物：硝基苯选择性加氢制苯胺

摘要 介孔氧化铝（meso-Al2O3）负载的贵金属催化剂已广泛应用于多相催化。然而，这些催化剂通常是通过湿化学制备的，存在几个缺点，例如：溶剂的过度使用和耗时的干燥过程。在这份手稿中，介绍了一种在异丙醇铝和嵌段共聚物 (P123) 之间进行固态加工的机械化学方法，以合成介观 Al2O3 负载的铂催化剂 (Pt/m-Al2O3)。所得的 Pt-meso-Al2O3 催化剂显示出高表面积（高达 465 m2/g）和均匀的孔径（~3.9 nm）。有趣的是，无溶剂球磨法能够将体积庞大的微米级 Pt 前体加工成分散良好的 Pt 纳米粒子（~4.8 nm）。而且，Pt/m-Al2O3 催化剂在硝基苯选择性加氢制苯胺方面表现良好（转化率：>99%，苯胺选择性：>99%）。这种机械化学路线提供了一种无溶剂的一步法合成介观-Al2O3 负载的贵金属催化剂。