Journal
CATALYSTS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/catal11111359
Keywords
cellulose; glucose; 5-Hydroxymethylfurfural; one-pot hydrolysis-dehydration; zirconium oxide
Categories
Funding
- Ministry of Science and Higher Education of the Russian Federation within the framework of State research program of the Boreskov Institute of Catalysis [AAAA-A21-121011390007-7]
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The study showed that ZrO2 catalysts prepared by microwave treatment exhibit high activity and stability. The preparation method and calcination temperature significantly impact the reactivity, while cellulose conversion is related to acidity and specific surface area. In potential applications, ZrO2 systems derived by microwave treatment demonstrate the best activity.
The one-pot hydrolysis-dehydration of activated microcrystalline cellulose was studied in pure hydrothermal water at 453 K over ZrO2 catalysts produced by thermodegradation, microwave treatment, mechanical activation, and sol-gel methods and spent without any co-catalyst. ZrO2 prepared by microwave treatment was more active compared to ones derived by other methods. The catalyst calcination temperature also impacted reactivity. The cellulose conversion increased simultaneously with acidity and S-BET, which in turn were set by the preparation method and calcination temperature. Phase composition did not affect the activity. Yields of glucose and 5-HMF reaching 18 and 15%, respectively, were over the most promising ZrO2 prepared by microwave treatment at 593 K. To our knowledge, this ZrO2 sample provided the highest activity in terms of TOF values (15.1 mmol g(-1) h(-1)) compared to the pure ZrO2 systems reported elsewhere. High stability of ZrO2 derived by microwave irradiation was shown in five reaction runs.
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