College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
Sci Total Environ. 2021 Jul 10;777:146037. doi: 10.1016/j.scitotenv.2021.146037. Epub 2021 Feb 22.
Since efficient isomerization of glucose to fructose is vital for valorizing cellulose fraction of biomass to value-added chemicals, an approach of engineering aluminum-hydrochar catalyst by impregnating aluminum on swollen cellulose derived hydrochar has been studied. The results showed that Al-hydrochar calcinated at 300°C achieved fructose yield of 26.3% in acetone/HO reaction medium. It was found that the amorphous Al structures with nano-size on the surface of the carbon microspheres were the major contributor of the catalytic activity on glucose to fructose isomerization, while the formation of Al crystal had an inhibition effect on glucose isomerization. The deactivation study of Al-hydrochar catalysts showed the exfoliation of colloidal carbon containing aluminum active catalytic sites. This finding provides a novel strategy for efficient isomerization of glucose by Al-hydrochar prepared through hydrothermal carbonization and mild calcination activation process.
鉴于将纤维素生物质转化为高附加值化学品过程中葡萄糖高效异构化为果糖至关重要，本研究采用浸渍法将铝负载到溶胀纤维素衍生水热炭上，制备了一种铝水炭催化剂。结果表明，在丙酮/HO 反应介质中，于 300°C 煅烧水热炭负载的铝催化剂可获得 26.3%的果糖产率。研究发现，碳微球表面具有纳米级尺寸的无定形铝结构是葡萄糖异构化为果糖过程中催化活性的主要贡献者，而铝晶体的形成则对葡萄糖异构化具有抑制作用。对铝水炭催化剂的失活动力学研究表明，含有铝活性催化位的胶体碳发生了剥离。该发现为通过水热碳化和温和煅烧激活过程制备的铝水炭高效异构化葡萄糖提供了一种新策略。
