School of Environmental Science and Engineering, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
School of Environmental Science and Engineering, State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China; Center of Hydrogen Science, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
Sci Total Environ. 2021 Jul 15;778:146276. doi: 10.1016/j.scitotenv.2021.146276. Epub 2021 Mar 8.
The development of inexpensive and efficient heterogeneous catalyst for the conversion of biomass including food and winery processing waste to value-added products is crucial in biorefinery. Glucose could be obtained via the hydrolysis of waste cellulose or starch-rich material, and the isomerization of glucose to fructose using either Lewis acid or Brønsted base catalysts is an important route in biorefinery. As a natural clay mineral, bentonite (Bt) is widely used as adsorption material and catalyst support, but how its intrinsic acid-base properties can impact the biomass conversion chemistry is still rarely reported. In this study, we investigated the influence of the textural and acid-base properties of Bt on the glucose isomerization reaction. The reaction kinetics and mechanism, and the effect of Al-exchange were explored. The results showed that the activation energy of Bt-catalyzed glucose conversion was 59.0 kJ mol, and the in-situ Fourier transform infrared spectrometer (FT-IR) characterization proved that Brønsted base was responsible for the isomerization. The highest fructose yield of 39.2% with 86.3% selectivity could be obtained at 110 °C for 60 min in water. Alkaline rinse and calcination can recover most of the catalytic activity of the spent catalyst.
在生物炼制中，开发用于将生物质（包括食品和酿酒加工废物）转化为增值产品的廉价且高效的多相催化剂至关重要。葡萄糖可以通过废纤维素或富含淀粉的物质的水解获得，而使用路易斯酸或布朗斯台德碱催化剂将葡萄糖异构化为果糖是生物炼制中的重要途径。作为一种天然粘土矿物，膨润土（Bt）广泛用作吸附材料和催化剂载体，但关于其内在酸碱性质如何影响生物质转化化学的报道却很少。在本研究中，我们研究了 Bt 的结构和酸碱性质对葡萄糖异构化反应的影响。考察了反应动力学和机理以及 Al 交换的影响。结果表明，Bt 催化的葡萄糖转化的活化能为 59.0 kJ/mol，原位傅里叶变换红外光谱（FT-IR）表征证明，异构化是由 Brønsted 碱引起的。在 110°C 下反应 60 min 时，水相中葡萄糖的最高果糖收率为 39.2%，选择性为 86.3%。用碱性溶液和煅烧可以回收失活催化剂的大部分催化活性。
