Catalytic conversion of cellulose to reducing sugars over clay-based solid acid catalyst supported nanosized SO42−-ZrO2
| Autor: | Chun Hui Zhou, Dongshen Tong, Fang Kai, Yang Haiyan, Weihua Yu, Yang Miao, Zhou Yang |
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| Rok vydání: | 2020 |
| Předmět: |
Zirconium
Coprecipitation chemistry.chemical_element 020101 civil engineering Geology 02 engineering and technology 021001 nanoscience & nanotechnology 0201 civil engineering Catalysis law.invention chemistry.chemical_compound Hydrolysis Montmorillonite chemistry Geochemistry and Petrology law Yield (chemistry) Calcination Cellulose 0210 nano-technology Nuclear chemistry |
| Zdroj: | Applied Clay Science. 185:105376 |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2019.105376 |
| Popis: | Cellulose is the most abundant form of biomass on earth, and is considered as an alternative for fuels and chemicals. The hydrolysis of cellulose to platform compounds, such as reducing sugars (RS), is one of the most important ways for the utilization of cellulose. In this study, the solid acid catalysts of SO42−-ZrO2/montmorillonite (SZ-Mt) were prepared by coupling SO42− with ZrO2 and then introducing into the interlayer of Mt using the coprecipitation method. Meanwhile, the catalytic performance of the SZ-Mt catalysts for the hydrolysis of cellulose to RS in water was studied. The catalysts were characterized by XRD, FT-IR, BET, SEM(EDS), NH3-TPD and XPS. The catalytic results showed that the SZ-Mt composite calcined at 500 °C with the molar ratio of S/Zr of 0.3 showed the highest total reducing sugars yield of 30.1%. The characterization results revealed that the surface S O bonds of sulfated zirconium oxide could gradually change from O=S-OH groups (type I, -HSO4) to O=S=O groups (type II, -S2O7). It was concluded that the surface S-OH groups in type I were responsible for the hydrolysis of cellulose in the low molar ratio of S/Zr and the new S-OH bonds formed by breaking the S-O-S bonds in type II were contributed to the conversion of cellulose in the high molar ratio of S/Zr. Finally, the mechanism of cellulose hydrolysis on the SZ composites was suggested. |
| Databáze: | OpenAIRE |
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