半纤维素基多孔水凝胶载钯高效催化铃木反应  

Hemicellulose-based Porous Hydrogel Supported Palladium Nanoparticles as Active Catalyst for Suzuki Reaction

作　　者：向志华 马纪亮 张礼慧 彭新文[1] 钟林新[1] XIANG Zhi-hua;MA Ji-liang;ZHANG Li-hui;PENG Xin-wen;ZHONG Lin-xin(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学制浆造纸国家重点实验室,广东广州510640

出　　处：《纤维素科学与技术》2018年第3期1-8,共8页Journal of Cellulose Science and Technology

基　　金：国家自然科学基金(21404043)

摘　　要：通过简单的化学改性在较温和的条件下制备了丙烯酰胺接枝半纤维素(AM-g-XH),并以其为原料制备了多孔水凝胶,然后通过浸渍、还原制备了丙烯酰胺改性半纤维素-异丙基酰胺互穿网络水凝胶载钯(AM-g-XH-NIPAM-Pd(0))催化剂。改性半纤维素中含量丰富的N和O元素以及水凝胶中的多级孔洞结构,有利于贵金属纳米颗粒的配位及分散。通过FT-IR、SEM、XRD、XPS和ICP-MS对催化剂(AM-g-XH-NIPAM-Pd(0))的物理结构以及化学组成进行了表征,并探究了其对Suzuki反应的催化性能。结果显示以K_2CO_3作为反应用碱、乙醇做为溶剂,在70℃的条件下反应3h,反应产率高达100%。并对底物的普适性进行了探究。另外,对催化剂的循环使用性测试表明此催化剂在重复使用8次后,其结构没有发生明显的变化,催化效率仍然可达97.83%。Acrylamide was grafted to hemicelluloses with simple chemical modification. Hydrogel, prepared with acrylamide graft hemicelluloses （AM-g-XH）, was impregnated in Pd2＋ before reduced to get AM-g-XH-NIPAM-Pd（0） catalyst. The abundant N and O elements of of hydrogels is contributed to the coordination of noble metal ions and porous structures of hydrogels can supply abundant space for the noble metal nanoparticles. The physical structures and chemical components of catalyst were characterized by FT-IR、SEM、XRD、XPS and ICP-MS, respectively. AM-g-XH-NIPAM-Pd（0） was applied in catalysis for the Suzuki reaction, and the experiment results showed that the yield of Suzuki reaction can reach 100% under the system of AM-g-XH-NIPAM-Pd（0）, ethanol, K2CO3 at 70℃ and for 3 h. There were no significant changes of porous structures and outflow of Pd nanoparticles after being reused eight times and the yield can reach 97.83%.

关 键 词：化学改性 半纤维素水凝胶 贵金属 铃木反应 

分 类 号：TQ314.1[化学工程—高聚物工业]