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<p>UiO–66–NH<sub>2</sub>(Ti/Zr) modified by Ti metal oxide (TiO<sub>2</sub>) was used to catalyze the hydrolysis of cellulose to prepare 5-HMF. Under the optimal reaction conditions of H<sub>2</sub>O(NaCl)/THF(1/4&#xa0;mL), 190&#xa0;°C, 2&#xa0;h and 50&#xa0;mg UNT-3(Ti/Zr) (TiO<sub>2</sub> and UiO–66–NH<sub>2</sub> with mass of 1.5 and 0.1&#xa0;g, respectively), the yield of 5-hydroxymethylfurfural reached 59.88%. UiO–66–NH<sub>2</sub>(Ti/Zr) nanocomposites with different mass ratios were successfully prepared by simple solvent evaporation method. SEM and TEM have shown that the modified UiO–66–NH<sub>2</sub>(Ti/Zr) are wrapped into sphere by TiO<sub>2</sub> densely attached to the surface of UiO–66–NH<sub>2</sub>, which provides favorable conditions for the uniform dispersion of TiO<sub>2</sub> and coordination of the Lewis acidic site of UiO–66–NH<sub>2</sub>. NH<sub>3</sub>–TPD results confirmed the existence of super-strong, strong, middle and weak acid sites in UiO–66–NH<sub>2</sub>(Ti/Zr), and Py-FTIR confirmed the existence of Brønsted and Lewis acids. After four cycles, the yield of 5-HMF and FUR decreased slightly from 59.88 to 51.89% and 9.11 to 7.66%, respectively, and the yield of 5-HMF could still remain above 50%. The results showed that the modified composite treatment of TiO<sub>2</sub> with rich Lewis acid/base and UiO–66–NH<sub>2</sub> could provide a certain idea for the extensive application of biomass research in the future.</p> Graphic Abstract <p></p>

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Synthesis of UiO–66–NH2(Ti/Zr) and its Catalytic Conversion of Cellulose to 5-HMF

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Lingling Xu,
  • Xiaomei Pan,
  • Lijing Gao,
  • Ruiping Wei,
  • Jihang Li,
  • Xiu Wen,
  • Yuanzhuang Li,
  • Guomin Xiao

摘要

UiO–66–NH2(Ti/Zr) modified by Ti metal oxide (TiO2) was used to catalyze the hydrolysis of cellulose to prepare 5-HMF. Under the optimal reaction conditions of H2O(NaCl)/THF(1/4 mL), 190 °C, 2 h and 50 mg UNT-3(Ti/Zr) (TiO2 and UiO–66–NH2 with mass of 1.5 and 0.1 g, respectively), the yield of 5-hydroxymethylfurfural reached 59.88%. UiO–66–NH2(Ti/Zr) nanocomposites with different mass ratios were successfully prepared by simple solvent evaporation method. SEM and TEM have shown that the modified UiO–66–NH2(Ti/Zr) are wrapped into sphere by TiO2 densely attached to the surface of UiO–66–NH2, which provides favorable conditions for the uniform dispersion of TiO2 and coordination of the Lewis acidic site of UiO–66–NH2. NH3–TPD results confirmed the existence of super-strong, strong, middle and weak acid sites in UiO–66–NH2(Ti/Zr), and Py-FTIR confirmed the existence of Brønsted and Lewis acids. After four cycles, the yield of 5-HMF and FUR decreased slightly from 59.88 to 51.89% and 9.11 to 7.66%, respectively, and the yield of 5-HMF could still remain above 50%. The results showed that the modified composite treatment of TiO2 with rich Lewis acid/base and UiO–66–NH2 could provide a certain idea for the extensive application of biomass research in the future.

Graphic Abstract