Non-aqueous synthesis of homogeneous molybdenum silicate microspheres and their application as heterogeneous catalysts in olefin epoxidation and selective aniline oxidation

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Authors

SKODA David HANULIKOVA Barbora STÝSKALÍK Aleš VYKOUKAL Vít MACHÁČ Petr URBANEK Pavel DOMINCOVA BERGEROVA Eva ŠIMONÍKOVÁ Lucie KURITKA Ivo

Year of publication 2022
Type Article in Periodical
Magazine / Source Journal of Industrial and Engineering Chemistry
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S1226086X21006572
Doi http://dx.doi.org/10.1016/j.jiec.2021.12.001
Keywords Molybdenum silicate; Non-aqueous; Microspheres; Catalyst; Epoxidation; Aniline oxidation
Description In this work, a novel synthesis of homogeneous molybdenum silicate spheres under non-aqueous conditions is presented. A preparation method is based on the condensation of molybdenum metal–organic framework-based precursor solution prepared via a microwave-assisted approach from bis(acetylacetonato)dioxomolybdenum and biphenyl-4,4'-dicarboxylic acid with 3-aminopropyltriethoxysilane under non-aqueous conditions. The as-prepared product was calcined at 500 °C to obtain amorphous and porous molybdenum silicate microspheres with homogeneously distributed molybdenum species within silicate matrix. The microspheres exhibit an average size of about 480 nm. This material was further studied as a heterogeneous catalyst for the epoxidation of olefins via the model catalytic epoxidation of cyclohexene with cumylhydroperoxide. High catalytic activity at the moderate temperature (65 °C) with the conversion of 86% after 2 h and the high selectivity to cyclohexene oxide has been achieved. In addition, molybdenum silicate microspheres exhibit catalytic activity and high selectivity in the oxidation of aniline to nitrosobenzene.
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