以生物质为原料制备生物燃料对解决日益严峻的能源问题具有重大的战略意义。生物质的亚/超临界液化是一种快速有效的转化方法，但所产生的生物油由于品质低而需要进行品质提升，目前实现工业化具有较高的难度，因此开发出一种生物质高效转化的新方法是个重要的课题。本项目拟利用亚/超临界乙醇能快速解聚纤维素大分子的优良性能，结合催化加氢实现一步转化纤维素制高品质的生物燃料，有望从源头上解决生物油低品质的缺点。通过化学气相沉积法（CVD）制备限域在多壁碳纳米管（MWCNTs）中的Pd纳米粒子为催化剂（Pd/MWCNTs），以乙醇为原料催化重整提供氢源，催化加氢转化纤维素得到生物混合醇。考察纳米Pd催化剂的组成结构和不同反应条件对纤维素转化率和产物选择性的影响，阐明催化剂结构和催化性能的关系，为生物质高效转化催化剂的设计和制备提供科学依据。研究纤维素的催化转化机理，为生物质高效转化新方法的开发提供理论基础。

It is of strategic significance to resolve the increasingly serious energy issue via the conversion of biomass into bio-fuels. The liquefaction of biomass in sub/supercritical fluid is a fast and effective method, but the produced bio-oil is the low quality and needs to further improve its quality, moreover, it is very difficult to use it in a large-scale at present, and therefore develops a new conversion method is an very important issue. This project plans to take advantage of the excellent performance of the sub/supercritical ethanol for fast depolymerization of cellulose into soluble small molecular, and combine with the catalytic hydrogenation to get bio-fuels, so as to avoid the shortcomings of bio-oil. Pd nanoparticles encapsulated in multi-walled carbon nanotubes (MWCNTs) prepared by chemical vapor deposition (CVD) as the catalyst (Pd/MWCNTs), cellulose is hydrogenated to get bio-alcohols with hydrogen produced by catalytic reforming ethanol. The project intends to investigate the effect of Pd catalyst composition and reaction conditions on the cellulose conversion and product selectivity, and to clarify the relationship between catalyst structure and its catalytic performance，this will provide a scientific basis for the desigh and preparation of a high-effective catalyst. The catalytic transformation mechanism of cellulose will be studied, it will provide a theoretical basis for the development of a new method of efficient conversion of biomass to biofuel.