Abstract
Highly dispersed micrometric mica particles with a uniform size and flake-like morphology were crystallized from an initial gel composed of Al2O3-K2O-ZnO-SiO2-H2O-EtOH (1.0: 24.0: 3.9: 5.3: 1050: 43.2) using Ludox AS-40 colloidal silica (40 wt.% suspension in water) as a silica source and a suitable amount of EtOH as an additive. Micrometric mica was used to prepare Co2+-exchanged catalyst by a common ion-exchange procedure. The catalyst was first successfully applied in aerobic epoxidation of styrene. Freshly prepared catalyst provided 92.1 mol.% conversion of styrene and selectivity to epoxide of 84.6%. Recycling studies showed feasibility of catalyst regeneration and the possibility of the repeated use of Co2+-exchanged mica as a heterogeneous catalyst.
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This work was financially supported by National Natural Science Foundation of China (22072038, U20A20122), Scientific Research Project of Hubei Education Department (T2020023, B2019219), and the Fund of Jingmen Science and Technology Project (ZDCX2017004, 2019YFYB007, 2020ZDYF002).
This paper does not contain descriptions of studies on animals or humans.
The authors declare no competing interests.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1543–1549, August, 2021.
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Zhan, H.J., Zhao, L., Zeng, N. et al. Co2+-Exchanged flake-like micrometric mica as an efficient solid catalyst for aerobic epoxidation of styrene. Russ Chem Bull 70, 1543–1549 (2021). https://doi.org/10.1007/s11172-021-3250-z
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DOI: https://doi.org/10.1007/s11172-021-3250-z