Highly selective conversion of guaiacol to: Tert -butylphenols in supercritical ethanol over a H 2 WO 4 catalyst

Fuhang Mai, Kai Cui, Zhe Wen, Kai Wu, Fei Yan, Mengmeng Chen, Hong Chen*, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
21 Downloads (Pure)

Abstract

The conversion of guaiacol is examined at 300 °C in supercritical ethanol over a H 2 WO 4 catalyst. Guaiacol is consumed completely, meanwhile, 16.7% aromatic ethers and 80.0% alkylphenols are obtained. Interestingly, tert-butylphenols are produced mainly with a high selectivity of 71.8%, and the overall selectivity of 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-4-ethylphenol is as high as 63.7%. The experimental results indicate that catechol and 2-ethoxyphenol are the intermediates. Meanwhile, the WO 3 sites play an important role in the conversion of guaiacol and the Brønsted acid sites on H 2 WO 4 enhance the conversion and favour a high selectivity of the tert-butylphenols. The recycling tests show that the carbon deposition on the catalyst surface, the dehydration and partial reduction of the catalyst itself are responsible for the decay of the H 2 WO 4 catalyst. Finally, the possible reaction pathways proposed involve the transetherification process and the alkylation process during guaiacol conversion.

Original languageEnglish
Pages (from-to)2764-2771
Number of pages8
JournalRSC Advances
Volume9
Issue number5
DOIs
Publication statusPublished - 20 Dec 2018
MoE publication typeA1 Journal article-refereed

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