期刊
JOURNAL OF CATALYSIS
卷 389, 期 -, 页码 623-630出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.07.002
关键词
Zirconium-substituted zeolites; Alkaline treatment; Acid sites; Deactivation; Meerwein-Ponndorf-Verley reduction; Furfural
资金
- National Key R&D Program of China [2018YFA0209402]
- National Natural Science Foundation of China [21673045, 21972025]
Zirconium-substituted zeolites prepared by post-synthetic procedure have demonstrated excellent performance in the upgrading process of biomass platform compounds owing to the unique Lewis acid character. However, many pressing questions still surround these materials, especially relating to specific conversion, catalyst stability and substrate scalability. In the present study, a simple alkaline treatment to the Zr-Al-Beta zeolite in alcoholic solution of alkali metal hydroxide was conducted. The modification of alkali-metal ions on both Lewis acid sites and Bronsted acid sites in Zr-Al-Beta was evidenced by XPS and FT-IR spectroscopy (CO and pyridine). The untreated materials displayed poor product selectivity and high coke deposit in the Meerwein-Ponndorf-Verley reduction of furfural and isopropanol; however, the treatment of alkali-metal ions promoted their catalytic performance with improved recalcitrance to deactivation and coking significantly. Both the type of alkali-metal ions and the concentration of alkaline solution influenced the catalytic performance, which were found to correlate to the acidity and textual properties. The optimum reaction result (97.3% yield of furfuryl alcohol at 99.6% conversion of furfural) can be obtained on 0.025 M-Na+Zr-Al-Beta with high tolerance to the furfural concentration. (C) 2020 Elsevier Inc. All rights reserved.
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