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首页> 外文期刊>Catalysis science & technology >Metal doping of porous materials via a post-synthetic mechano-chemical approach: a general route to design low-loaded versatile catalytic systems
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Metal doping of porous materials via a post-synthetic mechano-chemical approach: a general route to design low-loaded versatile catalytic systems

机译：通过一个金属掺杂多孔材料post-synthetic mechano-chemical方法:a一般的路线设计低负荷多才多艺催化系统

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摘要

Mesoporous silica materials (Al-SBA-15 and Al-MCM-41) were successfully doped with two different transition metals (Zr and Fe) by following a mechano-chemical approach. Different metal precursors (metal salts versus MOF particles) were studied in order to explore their impact on the ultimate catalytic performance of the doped materials. Importantly, doping levels as low as <1 wt% led to significant catalytic improvements for selective mild oxidation reactions under microwave irradiation in a very short reaction time (3 min). Fe-doped materials (0.175 mol% catalyst) resulted in the highest yields, achieving a maximum conversion of 46% and 100% selectivity in the oxidation of benzyl alcohol to benzaldehyde, and 61% conversion and 44% selectivity in the production of vanillin from isoeugenol. Results clearly indicated that the incorporation of Zr or Fe into the structure increased the total acidity of the support, which is then translated into an improved catalytic performance toward the studied oxidation reactions. The recyclability (up to 5 reuses without any treatment; although more reuses are possible after regeneration) of the doped catalysts pointed out their true potential applicability in a sustainable manner. Overall, this work demonstrates that the proposed post-synthetic mechano-chemical approach is an effective good alternative for the preparation of metal-doped porous materials, and is remarkably applicable to different doping metals, allowing thus the straightforward preparation of a library of catalysts with specific catalytic properties depending on the metal incorporated.
机译：(Al-SBA-15和介孔二氧化硅材料Al-MCM-41)成功地掺杂两种不同的过渡金属(Zr和铁)后mechano-chemical方法。金属前体(金属盐和财政部粒子)进行了研究,以探索自己对最终的催化性能的影响掺杂材料。低至< 1 wt %导致显著的催化改善选择性轻微的氧化反应在微波辐照下一个短的反应时间(3分钟)。(0.175摩尔%催化剂)导致最高收益率,实现最大的46%和转换100%苄氧化的选择性醇苯甲醛,转换和61%选择性44%香草醛的生产从异丁子香酚。Zr或铁到结构的公司增加的总酸度的支持,然后翻译成一种改进催化向研究氧化性能反应。没有任何治疗;掺杂的可能后再生)催化剂指出他们的真正潜力在一个可持续的方式适用性。这项工作表明,提出的是一个post-synthetic mechano-chemical方法有效的准备的不错的选择metal-doped多孔材料,非常适用于不同掺杂金属,允许因此,简单的准备一个图书馆催化剂与特定的催化性质根据金属合并。

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