期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 96, 期 8, 页码 2238-2248出版社
WILEY
DOI: 10.1002/jctb.6748
关键词
methyl lactate; glucose; Zn‐ Sn‐ Beta zeolite; hierarchical structure
类别
资金
- National Natural Science Foundation of China [21576161]
- Natural Science Basic Research Plan in Shaanxi Province [2019JQ-482]
The addition of zinc significantly improved the yield of methyl lactate from glucose, while other metals like indium, lanthanum, gallium, and nickel did not show the same improvements. The Zn-Sn-Beta catalyst showed a methyl lactate yield of 66.7% at 220 degrees Celsius.
BACKGROUND Methyl lactate is widely applied in the chemical, food, cosmetics and pharmaceutical industries. The conversion of carbohydrates over heterogeneous catalysts to methyl lactate is a promising environmentally benign process. RESULTS Hierarchical Sn-Beta zeolite (Sn-Beta) and corresponding bimetal-doped Beta zeolites (M-Sn-Beta; M = Zn, In, La, Ga, Ni) were prepared via a novel modified hydrothermal synthesis method to convert carbohydrates into methyl lactate. The introduction of Zn into Sn-Beta considerably improved the yield of methyl lactate from glucose, while for the catalysts containing In, La, Ga and Ni, such improvements were not observed. CONCLUSIONS A methyl lactate yield reaching up to 66.7% was obtained over Zn-Sn-Beta at 220 degrees C for 6 h. The enhanced catalytic performance was attributed to high Lewis acid density and strength, together with synergistic effects between framework Sn4+ and Zn2+ ions of Zn-Sn-Beta. Additionally, Zn-Sn-Beta demonstrated fructose and sucrose conversion into methyl lactate with yields of 68.4% and 70.0%, respectively. The Zn-Sn-Beta catalyst could be re-used at least five times with only a slight loss of methyl lactate yield. (c) 2021 Society of Chemical Industry (SCI).
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