Combination of H3PW12O40-TiO2 catalysts for photo-thermal oxidation of cyclohexene to adipic acid by 30% H2O2

In this work, 12-tungstophosphoric acid-TiO2 composite (PTA-TiO2) catalysts were fabricated by a simple method of impregnation-heat treatment. PTA-TiO2 composites were characterized by XRD, XPS, TG/DSC, FTIR, UV−vis diffuse reflectance spectra and N2 adsorption–desorption measurements. The results s...

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Bibliographic Details
Published in:Journal of environmental chemical engineering 2021-08, Vol.9 (4), p.105422, Article 105422
Main Authors: Liu, Guangrong, Chen, Mingxin, Jin, Xin, Song, Chuangfu, He, Feifei, Huang, Qiang
Format: Article
Language:English
Subjects:
Adipic acid
H3PW12O40-TiO2
Hydrogen peroxide
Photo-thermal oxidation
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Summary:In this work, 12-tungstophosphoric acid-TiO2 composite (PTA-TiO2) catalysts were fabricated by a simple method of impregnation-heat treatment. PTA-TiO2 composites were characterized by XRD, XPS, TG/DSC, FTIR, UV−vis diffuse reflectance spectra and N2 adsorption–desorption measurements. The results showed that the heat treatment temperature (200–500 °C) significantly affected the composition and structure of the composite. The higher calcination temperature could destroy the Keggin structure of PTA. The PTA-TiO2 catalyzed oxidation of cyclohexene by H2O2 to adipic acid demonstrated that the Keggin structure of PTA was critical to the catalytic activity of PTA-TiO2. Furthermore, under the photo-thermal catalytic condition, the reaction system showed higher cyclohexene conversion and adipic acid yield. A synergistic effect between the photo- and thermal approach was noticed in the PTA-TiO2 catalyst prepared at 200 °C (PTA-TiO2(200)). Based on the experimental data, a thermocatalysis-dominated but photocatalysis-promoted mechanism was proposed to explain the improvement in catalytic efficiency. The catalyzed oxidation of cyclohexene with photo-thermal synergy enables utilization of sunlight and offers a novel perspective for the manufacture of adipic acid. [Display omitted] •TiO2-PTA catalysts were synthesized by impregnation-heat treatment.•The catalysts showed photothermally catalytic activity towards the oxidation of cyclohexene to adipic acid by H2O2.•A thermocatalysis-dominated but photocatalysis-promoted mechanism is proposed.
ISSN:2213-3437
2213-3437
DOI:10.1016/j.jece.2021.105422