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首页> 外文期刊>Catalysis science & technology >Heterogeneity of polyoxometalates by confining within ordered mesopores: toward efficient oxidation of benzene to phenol
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Heterogeneity of polyoxometalates by confining within ordered mesopores: toward efficient oxidation of benzene to phenol

机译：异质性封闭的金属在有序中孔:向高效苯氧化苯酚

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摘要

Polyoxometalates (POMs) are a family of promising homogeneous catalysts for various processes. The design of POM-based heterogeneous catalysts, while important for real-world catalysis, is an important topic. Herein, a green and effective mechanochemical assembly strategy was developed to encapsulate the POM inside the ordered mesoporous polymer (OMP) with biomass tannin as the precursor. The strategy was realized by solid-state ball milling of the POM, using 3-aminophenol and tannin with F127 as the template, and removing the template by calcination. The POM-containing materials possessed uniform mesopores (5-10 nm) and high surface areas (150-250 m(2) g(-1)). In particular, the H5PM10V2O40-based OMP exhibited good activity (33% conversion and 100% selectivity) and stability (reused in five runs) for the hydroxylation of benzene to phenol. The results of experiments and characterizations demonstrated that the unique confinement structure and the reversible V5+/V4+ redox pairs induced by the strong interaction between the OMP and PMoV may account for the good catalytic performance.
机译：杂多酸(盐)是一个家庭的希望均相催化剂对各种流程。POM-based异构催化剂的设计,真实而重要的催化作用,是一个重要的课题。机械化学的组装策略了封装内部的POM命令介孔聚合物与生物质能单宁(OMP)的前身。固态POM的球磨,使用3-aminophenol和F127为单宁模板,和删除模板煅烧。拥有统一的中孔(5 - 10 nm)和高表面区域(150 - 250 m (2) g(1))。特别H5PM10V2O40-based OMP展出良好的活动转换(33%和100%在五分选择性)和稳定性(重用)苯酚羟基化的苯。实验的结果和特征证明了独特的监禁结构和可逆的V5 + / V4 +氧化还原对OMP之间的强相互作用引起的和PMoV可能占好的催化的性能。

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