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<p>Cellulose triacetate is a vital derivative of cellulose, which normally adopts H<sub>2</sub>SO<sub>4</sub> as catalysts, facing huge challenges associated with cellulose degradation and acid wastewater disposal. SO<sub>4</sub><sup>2−</sup>/M<sub><i>x</i></sub>O<sub><i>y</i></sub> has been proven to have higher catalytic performance in cellulose acetylation. However, the obvious loss of sulfur species can induce serious catalyst deactivation. Herein, an innovative solid superacid SO<sub>4</sub><sup>2−</sup>/TiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> successfully fabricated by carrier-supporting strategy can realize the effective synthesis of cellulose triacetate (CTA). Research displayed that compared with SO<sub>4</sub><sup>2−</sup>/TiO<sub>2</sub>, SO<sub>4</sub><sup>2−</sup>/TiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> presented loose and small irregular nanoparticles with much rough surface morphology. Meanwhile, the incorporation of Al<sub>2</sub>O<sub>3</sub> enhanced the overall acidic content by forming new Al-O = S bonds and providing empty places for accepting electrons acting as Lewis acids. The highly exposed active surface area along with copious and stable total acid sites may accelerate solution penetration and provide lasting high catalytic efficiency. When used for CTA production, SO<sub>4</sub><sup>2−</sup>/TiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> acquired a maximum degree of substitution (DS) of 2.97. Notably, it exhibited superior cyclic stability and only displayed a 1.7% DS drop after 5 CTA synthesis. Moreover, the resultant CTAs indicated splendid homogeneity, showing huge practical application potential. The finding depicts that sustainable SO<sub>4</sub><sup>2−</sup>/TiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> may enable the use of alternative cellulose sources for the production of high-quality CTA.</p>

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Solid superacid SO42−/TiO2/Al2O3 with unique “Ecological Infiltration System” for efficient catalytic synthesis of cellulose triacetate

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Hao Dong,
  • Dongming Wang,
  • Chen Wang,
  • Shuo Qi,
  • Mingxing Shi,
  • Guolin Tong,
  • Jie Wang,
  • Binbin Bian

摘要

Cellulose triacetate is a vital derivative of cellulose, which normally adopts H2SO4 as catalysts, facing huge challenges associated with cellulose degradation and acid wastewater disposal. SO42−/MxOy has been proven to have higher catalytic performance in cellulose acetylation. However, the obvious loss of sulfur species can induce serious catalyst deactivation. Herein, an innovative solid superacid SO42−/TiO2/Al2O3 successfully fabricated by carrier-supporting strategy can realize the effective synthesis of cellulose triacetate (CTA). Research displayed that compared with SO42−/TiO2, SO42−/TiO2/Al2O3 presented loose and small irregular nanoparticles with much rough surface morphology. Meanwhile, the incorporation of Al2O3 enhanced the overall acidic content by forming new Al-O = S bonds and providing empty places for accepting electrons acting as Lewis acids. The highly exposed active surface area along with copious and stable total acid sites may accelerate solution penetration and provide lasting high catalytic efficiency. When used for CTA production, SO42−/TiO2/Al2O3 acquired a maximum degree of substitution (DS) of 2.97. Notably, it exhibited superior cyclic stability and only displayed a 1.7% DS drop after 5 CTA synthesis. Moreover, the resultant CTAs indicated splendid homogeneity, showing huge practical application potential. The finding depicts that sustainable SO42−/TiO2/Al2O3 may enable the use of alternative cellulose sources for the production of high-quality CTA.