Ru/CNT 催化纤维二糖加氢制备山梨醇的机理及动力学

针对纤维素的转化,研究了以钌碳纳米管(Ru/CNT)为催化剂,纤维素模型分子纤维二糖催化加氢制备山梨醇的反应。通过对反应产物的分析,考察了纤维二糖转化生成山梨醇的反应机理,建立了纤维二糖催化加氢的动力学模型。并根据实验数据,拟合得到纤维二糖催化加氢反应各步的反应数率常数和表观活化能,其中,纤维二糖水解活化能为147.1 KJ·mol^-1;纤维二糖部分加氢活化能为73.8 KJ·mol^-1。纤维二糖催化加氢反应模型的建立,为纤维素资源的高效利用提供了重要的基础数据。

Mechanism and kinetics of cellobiose hydrogenation catalyzed by Ru/CNT

The production of chemicals or fuels from renewable biomass resources especially cellulose has attracted much attention because of the worldwide demand for less dependence on fossil resources. However, the direct utilization of cellulose is still a challenge because of its robust crystalline structure.Herein,the hydrogenation of cellobiose,a typical cellulose, over carbon nanotube supported ruthenium catalyst (Ru/CNT) was reported.The mechanism of cellobiose conversion was proposed and the kinetic equation was obtained.Based on the kinetic experiments carried out in the range 120—185℃ under 5.0 MPa H2, the reaction rate constants and activation energies of each reaction step in cellobiose hydrogenation were obtained with MATLAB, in which the activation energy for hydrolysis and hydrogenolysis of cellobiose was estimated as 147.1 kJ·mol^-1 and 71.2 kJ·mol^-1, respectively.The obtained kinetic model and some general rules on the catalytic hydrogenation of cellobiose may provide important data for efficient utilization of cellulose.