期刊
CHEMICAL ENGINEERING JOURNAL
卷 396, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125282
关键词
Biomass utilization; Ce-based heteropolyacid; Temperature-responsive catalyst; 5-hydroxymethylfurfural
资金
- National Key R&D Program of China [2018YFC1902904]
- Shenzhen Science and Technology Innovation Committee [KQJSCX2018032215150778, CYJ20180504165648211]
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control [2017B030301012]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme
The design of stable heteropolyacid (HPA) catalysts with strong Bronsted acidity and mild Lewis acidity is crucial for the efficient conversion of renewable biomass to value-added chemicals. Firstly, a novel strategy was proposed to synthesize the Ce-based HPA of H5CeW12O40. Secondly, the H5CeW12O40 was combined with ChCl to form a series of temperature-responsive HPA catalysts (Ch(n)H(5-n)CeW(12)O(40), n = 1-5), which allowed the catalysts to be applied as soluble catalysts at a temperature > 80 degrees C and be easily separated as an insoluble catalyst at a temperature < 80 degrees C. In the H2O/DMSO/MIBK biphasic system, one-pot production of 5-hydroxymethylfurfural (5-HMF) from cellulose was achieved with an excellent yield of 67.5% over ChH(4)CeW(12)O(40) catalysis at 140 degrees C for 6 h, and other carbohydrates were converted, including fructose (83.1%), glucose (74.2%), sucrose (75.8%), cellobiose (70.2%) and starch (68.7%). Such high efficiency was attributed to the homogeneous catalysis at high temperature, the strong Bronsted acidity of [H5-nCeW12O40](n-), and the appropriate Lewis acidity from Ce(III). Moreover, the temperature-responsive property and the high stability were beneficial for recycling without significant structural change and activity loss.
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