壳聚糖接枝丙烯酸负载钯纳米纤维催化剂的制备及催化氢化

Preparation of Chitosan Grafting Acrylic Acid Supported Palladium Fibrous Catalyst and Its Application in Hydrogenation

制备了壳聚糖接枝丙烯酸负载纳米钯催化剂并对其催化氢化性能进行了研究。首先对分子量为30万的商品壳聚糖进行降解,得到了黏均分子量为10万的壳聚糖,用后者制备壳聚糖接枝丙烯酸共聚物并负载氯化钯,最后通过电纺丝技术得到了纳米纤维状催化剂。对制备的催化剂进行了透射电镜(TEM),X射线光电子能谱(XPS)和红外光谱(IR)的表征。结果表明,纳米纤维的尺寸在70 nm～200 nm之间,钯颗粒在10 nm～40 nm之间,并且钯颗粒在纳米纤维上均匀分散。催化剂氢化α-辛烯,结果显示,α-辛烯的转化率为99%;该催化剂在Ni2+存在下催化α-辛烯反应,生成辛烷的产率为65%。

Chitosan grafting acrylic copolymer（CTS-g-AA） supported nano palladium catalyst was obtained and its hydrogenation properties were studied.Firstly,chitosan was degraded,and the degraded chitosan with the viscosity average molecular weight of 1×105 was obtained via a degradation of chitosan with a molecular weight of 3×105;Then chitosan grafting acrylic copolymer（CTS-g-AA） was synthesized and palladium was supported on this CTS-g-AA,formation of nano fibrous catalyst via electrospinning technique.The title catalysts were characterized by transmission electron microscope（TEM）,X-ray photoelectron specroscopy（XPS） and infrared spectrum（IR）.The results show that the diameter of nanofiber is about 70 nm～200 nm,the size of metal particles range of 10 nm～40 nm,and palladium particles disperse on nanofibers homogeneously.The catalyst was applied to catalyze α-octene hydrogenation.The results showed that the conversion of α-octene is 99%,and the yield of octane is 65% with the help of a Ni2＋ compound.