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Kaolinite: A natural and stable catalyst for depolymerization of cellulose to reducing sugars in water
Applied Clay Science ( IF 5.6 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.clay.2020.105512
Haiyan Yang , Dongshen Tong , Yuxiao Dong , Laibin Ren , Kai Fang , Chunhui Zhou , Weihua Yu

Abstract Kaolinite, a natural, abundant, low cost, and eco-friendly material, has been widely used as filler, additives, adsorbent and coatings. In the study, kaolinite was evaluated for the performance of the hydrolysis of cellulose in water. The effects of mass ratio, reaction temperature, reaction time and water amount were investigated in a batch reactor. The fresh and regenerated catalysts were characterized by XRD, FT-IR and TG-DTG. The catalytic results showed that the highest TRS yield of 38.8% was obtained on the kaolinite at 200 °C with the mass ratio of catalyst to cellulose of 0.2 for 3 h. Moreover, kaolinite was a stable catalyst after regeneration and the yield of TRS decreased from 38.8% to 38.1% after five times reuse. Kaolinite contains abundant surface Al-OH groups, and the high TRS yield for kaolinite should be attributed to the H+ ions released from the surface OH groups. This work provides a promising strategy for efficient cellulose hydrolysis into fine chemicals by natural clay minerals.

中文翻译:

高岭石:一种天然且稳定的催化剂,用于将纤维素解聚为水中的还原糖

摘要 高岭石是一种天然、储量丰富、成本低、环境友好的材料,被广泛用作填料、添加剂、吸附剂和涂料。在该研究中,评估了高岭石在水中水解纤维素的性能。在间歇式反应器中研究了质量比、反应温度、反应时间和水量的影响。通过XRD、FT-IR和TG-DTG对新鲜和再生的催化剂进行了表征。催化结果表明,在 200 ℃、催化剂与纤维素的质量比为 0.2 3 h 的条件下,高岭石的 TRS 产率最高,为 38.8%。此外,高岭石再生后是一种稳定的催化剂,重复使用五次后,TRS的产率从38.8%下降到38.1%。高岭石表面含有丰富的Al-OH基团,高岭石的高 TRS 产率应归因于从表面 OH 基团释放的 H+ 离子。这项工作为通过天然粘土矿物有效地将纤维素水解成精细化学品提供了一种有前景的策略。
更新日期:2020-04-01
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