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Issue 3, 2016
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Enhancement of para-selectivity in the phenol oxidation with H2O2 over Ti-MCM-68 zeolite catalyst

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Abstract

Although titanium silicalite-1 (TS-1) with an MFI framework (interconnected 10-ring micropores) is a useful catalyst for phenol oxidation, Ti-MCM-68, a novel MSE-type titanosilicate with 12-ring and 10-ring micropores, has been developed as a phenol oxidation catalyst with high activity and selectivity toward the p-isomer, hydroquinone. This report describes the improvement in catalytic activity and para-selectivity of Ti-MCM-68 for phenol oxidation. Thermal treatment after Ti insertion significantly enhanced the catalytic activity of Ti-MCM-68, mainly due to an improvement in the hydrophobicity in the micropores. Silylation of the external surface of Ti-MCM-68 with Ph2SiCl2, followed by Ti insertion and calcination, showed greater para-selectivity, indicating that the selective formation of p-isomers occurred within one-dimensional 12-ring micropores in the Ti-MCM-68. The addition of ethanol as a cosolvent to the reaction mixture resulted in the best para-selectivity (>94%) and activity among the modified Ti-MCM-68 catalysts.

Graphical abstract: Enhancement of para-selectivity in the phenol oxidation with H2O2 over Ti-MCM-68 zeolite catalyst

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Publication details

The article was received on 07 Jun 2015, accepted on 20 Aug 2015 and first published on 21 Aug 2015


Article type: Paper
DOI: 10.1039/C5GC01237F
Green Chem., 2016,18, 735-741

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    Enhancement of para-selectivity in the phenol oxidation with H2O2 over Ti-MCM-68 zeolite catalyst

    S. Inagaki, Y. Tsuboi, M. Sasaki, K. Mamiya, S. Park and Y. Kubota, Green Chem., 2016, 18, 735
    DOI: 10.1039/C5GC01237F

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