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Heterogenization of polyoxometalates as solid catalysts in aerobic oxidation of glycerol

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Abstract

A series of heterogeneous catalysts based on phosphomolybdic salts with different metals in counter or substituent positions, LnPMo12O40 (L = Al3+, Fe3+, Cr3+, Ti4+, Zr4+ and Zn2+, abbreviated as LPMo12) and HxPMo11LO39 (L = Zn2+, Cr3+, Fe3+, Al3+, Ti4+, for Ti4+; the amount of O is 40, abbreviated as HPMo11L), were prepared using a simple calcination treatment and were evaluated in aerobic oxidation of glycerol. After calcination at about 250 °C for 4 h, homogeneous LnPMo12O40·nH2O and HxPMo11LO39·mH2O became heterogeneous. Their specific surface areas were also enhanced as well as their activity and reusability. Similar to the homogeneous catalysts, AlPMo12 treated at 400 °C (AlPMo12-400) was found to be the most active catalyst in glycerol oxidation to lactic acid, with 96.1% yield and 98.6% conversion at 60 °C for 5 h with 1 MPa of O2; it gave a turnover number (TON; TON = [LA]/[catalyst]) of 2.4 × 102, higher than that of AlPMo12-250 treated at 250 °C (TON = 2.0 × 102). AlPMo12 behaved as a heterogeneous catalyst in glycerol oxidation and could be reused at least 12 times. AlPMo12-400 also performed well in crude glycerol oxidation, affording lactic acid yields as high as 86.8%.

Graphical abstract: Heterogenization of polyoxometalates as solid catalysts in aerobic oxidation of glycerol

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Supplementary files

Article information


Submitted
01 Mar 2020
Accepted
03 May 2020
First published
05 May 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Heterogenization of polyoxometalates as solid catalysts in aerobic oxidation of glycerol

M. Tao, Y. Li, Y. Li, X. Zhang, Y. V. Geletii, X. Wang and C. L. Hill, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY00403K

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