半纤维素-g-壳聚糖负载钯(0)催化剂的制备与催化性能  

Preparation and Catalysis Performance of Hemicelluloses-g-Chitosan-Pd(0) Catalyst

作　　者：彭新文[1] 谭杰文[1] 吴昌艳 邓青[1] 林佳纯 孙润仓[2] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]北京林业大学生物质化学与技术研究所,北京100083

出　　处：《华南理工大学学报（自然科学版）》2016年第6期27-34,40,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(21404043);广州市科技计划项目(201504010033);广东省公益研究与能力建设专项(2015A010105005);华南理工大学中央高校基本科研业务费专项资金资助项目(2015ZZ045)~~

摘　　要：通过较温和的click反应制备了半纤维素-g-壳聚糖化合物,并以其为载体通过简单的还原方式制备了半纤维素-g-壳聚糖负载钯(0)催化剂.利用傅里叶红外光谱、热重分析、扫描电镜、X射线衍射、X射线光电子能谱分析等方法对催化剂进行了表征,发现该催化剂对Suzuki偶联反应有较好的催化活性.考察不同的反应溶剂、催化剂用量、反应温度、碱、底物种类和循环回用次数对Suzuki反应产率的影响.结果表明:以无水乙醇为溶剂、K2CO3为碱时,在70℃下反应3 h,反应产率高达84%;催化剂可以通过简单的方法回收但重复使用性能有一定下降,重复使用5次后产率降至61.6%.Hemicelluloses-g-chitosan was prepared via click reaction under mild conditions and was used as a sup- porter to produce hemieelluloses-g-ehitosan-palladium（0） catalyst through a simple reduction reaction. Then, the catalyst was characterized by means of FT-IR, TGA, SEM, XRD and XPS, with high catalytic activity for Suzuki coupling being revealed. Moreover, the yields of Suzuki reaction affected by the solvent type, the catalyst dosage, the reaction temperature, the base, the substrate and the recycle number were investigated. The results show that the yield is up to 84% after a reaction at 70 ℃ for 3 h by using ethanol as the solvent and K2CO3 as the base; and that the catalyst can be recycled through a simple method and be reused at least five times, with a yield decreasing to 61.6%.

关 键 词：半纤维素-g-壳聚糖 半纤维素-g-壳聚糖负载钯(0)催化剂 SUZUKI偶联反应 催化活性 

分 类 号：TS743.14[轻工技术与工程—制浆造纸工程] Q55[生物学—生物化学]