Functionalized metal–organic frameworks with strong acidity and hydrophobicity as an efficient catalyst for the production of 5-hydroxymethylfurfural

• 作者: Huan Li Yao Zhong Luxi Wang Qiang Deng Jun Wang Zheling Zeng Xinxiang Cao Shuguang Deng
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Catalysis, Kinetics and Reaction Engineering
• 页码范围: 167-174
• 页数: 8页
• 语种: 英文

摘要

In the dehydration of fructose to 5-hydroxymethyl furfural (HMF), in situ produced water weakens the acid strength of the catalyst and causes the rehydration of HMF, causing unsatisfactory catalytic activity and selectivity. In this work, a class of benzenesulfonic acid-grafted metal–organic frameworks with strong acidity and hydrophobicity is obtained by the direct sulfonation method using 4-chlorobenzenesulfonic acid as sulfonating agent. The resultant MOFs have a specific surface area of greater than 250 m2?g 1, acid density above 1.0 mmol?g 1, and water contact angle up to 129?. The hydrophobic MOF-PhSO3H exhibits both higher catalytic activity and selectivity than MOF-SO3H in the HMF synthesis due to its better hydrophobicity and olephilicity. Moreover, the catalyst has a high recy-cled stability. At last, fructose is completely converted, and 98.0％ yield of HMF is obtained under 120 ?C in a DMSO solvent system. The successful preparation of the hydrophobic acidic MOF provides a novel hydrophobic catalyst for the synthesis of HMF.