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

Abstract: Hemicelluloses-g-chitosan was prepared via click reaction under mild conditions and was used as a sup- porter to produce hemicelluloses-g-chitosan-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 3h 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%.

Key words: hemicelluloses-g-chitosan, hemicelluloses-g-chitosan-palladium(0) catalyst, Suzuki coupling reac- tion, catalytic activity