A Green and Sustainable Approach for Acetalization of Benzaldehyde Using Tungstophosphoric Acid Loaded on Metal Oxide Catalysts. | [Journal of Chemical Society of Pakistan • 2019]

Author(s):

1. Li Fanghao: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

2. Li Chenjie: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

3. Chen Junyi: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

4. Wang Kuiwu: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

5. Zhang Haijiang: Jiangsu Key Laboratory of Regional Resource Exploitation and Medicinal Research, Huaiyin Institute of Technology, Huaian China

6. Wang Yanbo: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

7. Han Xiaoxiang: Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou China

Abstract:

Summary: A series of tungstophosphoric acid (H3PW12O40; HPW) loaded on metal oxide catalysts, namely H3PW12O40/M (M= TiO2, CeO2, ZrO2) was prepared by initial wetting impregnation method and their catalytic performances were also investigated during the condensation reaction of benzaldehyde with glycol. Among them, the 20 wt% H3PW12O40/TiO2 catalyst demonstrated highly active with superior acetal yield (90.1 %) and excellent durability. The high activity of the catalyst derived from high surface area, ultra-strong Brønsted acidity and synergetic effect of Brønsted-Lewis acid. Response surface methodology (RSM) based on Box-Behnken design (BBD) was used to optimize the course of the condensation reaction of benzaldehyde with glycol, and the optimal benzaldehyde glycol acetal yield (93.4 %) could be obtained. The optimized yield and the experimental results are similar. Moreover, under optimal reaction conditions, the activation energy (Ea) of reaction could be obtained through the kinetic study of the irreversible parallel reaction model, and the Ea was 23.24 kJ/mol.

Page(s): 805-819

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 41, Issue: 5, Year: 2019

Keywords:

Heteropolyacid

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