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Heterogeneity of polyoxometalates by confining within ordered mesopores: toward efficient oxidation of benzene to phenol

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Abstract

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 m2 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.

Graphical abstract: Heterogeneity of polyoxometalates by confining within ordered mesopores: toward efficient oxidation of benzene to phenol

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Publication details

The article was received on 10 Feb 2019, accepted on 20 Mar 2019 and first published on 21 Mar 2019


Article type: Paper
DOI: 10.1039/C9CY00288J
Citation: Catal. Sci. Technol., 2019, Advance Article

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    Heterogeneity of polyoxometalates by confining within ordered mesopores: toward efficient oxidation of benzene to phenol

    Y. Leng, Y. Jiang, H. Peng, Z. Zhang, M. Liu, K. Jie, P. Zhang and S. Dai, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00288J

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