磁性仿酶固体酸水相中催化纤维素水解机理研究

结合酸和酶催化纤维素水解的反应机理，本项目提出以生物质为碳基材料，分别将功能化官能团和磁性Fe3O4颗粒引入至修饰改造过的材料表面和孔道中，制备水相中催化纤维素水解的磁性仿酶固体酸催化剂。通过考察碳基材料种类及其表面性质和孔道结构对官能团负载量的影响，建立碳基材料的选择机制和评价方法；通过考察磁性Fe3O4颗粒在溶液和催化剂孔道中的分布情况，总结磁性Fe3O4颗粒粒径的调控机制并建立在孔道中的镶嵌方法；通过对催化纤维素水解反应进行考察，明晰各因素对催化剂中官能团和磁性颗粒在水热环境中稳定性的影响机制以及官能团与纤维素糖苷键间的作用机理，阐述对纤维素水解具有高催化活性、选择性的碳基材料特性，明晰催化水解反应过程中的传质特性，建立宏观动力学模型，为催化剂制备和水解工艺优化提供理论指导。该项目的研究，可为节能环保地利用纤维素能源提供一条新思路。

Based on the catalysis mechanisms of cellulose hydrolysis by both acid and enzyme, the program proposed that the magnetic mimetic enzyme solid acid catalyst for cellulose hydrolysis is prepared by introducing functional groups into the medified surface and internal hole channel using biomass as carbon-based materials. The selection mechanism and evaluation method are established by investigation the effects of surface characterization and channel structure of carbon based material on the functional groups loading. The regulation mechanism of particle size and mosaic method in the internal channel is obtained by study on the distribution of magnetic Fe3O4 particle in solution and catalyst channel. The effect of each factor on the stability of functional groups and Fe3O4 particle in hydrothermal enviroment, and reaction mechanism between functional groups and glycoside bonds of cellulose are obtained by investigating the cellulose hydrolysis reaction. Based on the characterizations of high active and selective carbon based materials, and mass transfer principle during the reaction, macro kinetic model, which can provide a guidance for catalyst preparation and hydrolysis conditions optimum, is developed. After finish the program, a new energy conservation and environmental protection way for the utilization of cellulose energy is provided.