纤维素脱水-加氢一体化连续生产2-甲基呋喃关键催化基础研究

The catalytic conversion of cellulose and hemicellulose from agricultural waste lignocellulose to clean furyl-biofuels has attracted much attention. However, the preparation process of 2-Methylfuran by catalytic conversion of cellulose was complex, which include multi-step reactions such as sugar dehydration and furan derivative hydrogenation. This study mainly focuses on the development of dehydration-hydrogenation integrated continuous process for the 2-methylfuran preparation from cellulose. Hβ zeolite with small crystal size was prepared for the cellulose catalytic dehydration by optimizing the preparation method and parameters. The fibrous tubular Cu/SiO2 catalyst with high Cu dispersion and metal-acid bi-functional active sites was prepared by the homogeneous precipitation-crystallization method for the selective hydrogenolysis of furfural to 2-methylfuran. The reaction mechanism of C-O dehydration, C-C cleavage, C=O hydrogenation and C-O hydrogenolysis in the selective catalytic conversion of cellulose to 2-methylfuran process were intensive studied, which will set light on the process parameter optimization and catalyst development.

将农业废木质纤维素中的纤维素、半纤维等含糖资源高效转化为清洁的呋喃类含氧燃料受到人们的广泛关注。本课题针对纤维素催化转化制备生物质基液体燃料2-甲基呋喃，反应过程复杂、工艺路线长的缺点。开发纤维素脱水-加氢一体化连续化生产生物质基燃料2-甲基呋喃工艺，简化工艺流程，降低生产本。通过优化Hβ分子筛制备方法及工艺参数，开发出与纤维素脱水相适应的小晶粒高效专用分子筛，实现纤维素高效转化。发展新型均匀沉淀-晶化法制备出金属分散度高、金属-酸性功能相匹配的高效纤维管状纳米铜硅催化剂，将糠醛高选择性的转化为2-甲基呋喃。详细探讨纤维素脱水-加氢制备2-甲基呋喃过程中所涉及的各种C=O、C-O、C-C基团的选择性脱水、断裂、加氢、氢解等反应机理，为工艺优化和高性能催化剂开发提供理论指导。