Green Processing and Synthesis | |
Water-soluble heteropolyacid-based ionic liquids as effective catalysts for oxidation of benzyl alcohol in water with hydrogen peroxide | |
article | |
Ouyang Kai1  Han Xiaoxiang1  Xiong Chunhua1  Tang Xiujuan2  Chen Qing1  | |
[1] Department of Applied Chemistry, Zhejiang Gongshang University;College of Environmental Science and Engineering, Zhejiang Gongshang University | |
关键词: ionic liquid; optimization; oxidation; reaction engineering; tungstophosphoric acid; | |
DOI : 10.1515/gps-2016-0237 | |
来源: De Gruyter | |
【 摘 要 】
A series of organic-inorganic composite catalysts were prepared by modifying tungstophosphoric acid (H 3 PW 12 O 40 ) and propyl sulfonic acid-functionalized ionic complex. The obtained water-soluble catalysts were well characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and nuclear magnetic resonance, and investigated for their performance as homogeneous catalysts for selective oxidation of benzyl alcohol (BzOH) with hydrogen peroxide (H 2 O 2 ) in water. Among them, the [DMBPSH]H 2 PW 12 O 40 catalyst exhibited the best oxidative activity with a desirable benzaldehyde (BzH) selectivity of 97.0% and an excellent BzOH conversion of 98.5%. Further kinetic studies and model analysis by response surface methodology revealed that alcohols’ oxidation reaction followed an apparent order of 2.2 with an activation energy of 36.18 kJ/mol. And the optimal reaction conditions were established as follows: BzOH/H 2 O 2 molar ratio of 1:1.7, amount of catalyst 5.4 wt%, reaction time 3.9 h, amount of water 24 ml, and a maximum yield of BzH of 95.8%. Under optimum conditions, [DMBPSH]H 2 PW 12 O 40 catalyst showed a superior catalytic efficiency and reusability due to strong acidity and excellent surface activity.
【 授权许可】
CC BY
【 预 览 】
Files | Size | Format | View |
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RO202107200001712ZK.pdf | 496KB | download |