淀粉负载钯催化剂的制备及对Heck反应的催化性能  

Synthesis of Starch Supported Palladium Catalyst and Its Catalytic Properties for Heck Reaction

作　　者：张磊[1] 崔元臣[1] 

机构地区：[1]河南大学化学化工学院,开封475001

出　　处：《应用化学》2005年第4期440-444,共5页Chinese Journal of Applied Chemistry

摘　　要：合成了淀粉负载钯催化剂,用XPS、TG、DTA和TEM等对其进行了表征。热分析结果表明,该催化剂在室温至220℃范围内有很好的热稳定性;TEM观察证实,钯在催化剂中分布比较均匀,钯颗粒呈球形,平均粒径为10nm左右。淀粉负载钯不需在惰性气体氛围中,并且只需较少的催化剂用量就能有效地催化共轭烯烃的Heck芳基化反应,生成取代的反式肉桂酸、1, 2 二苯乙烯,在较低的温度(80℃)下催化碘苯与丙烯酸的反应,产率达81%,显示了较高的催化活性。催化剂重复使用三次,钯含量逐渐降低为3. 5%、2. 6%和2 .0%,这是催化剂再重复使用过程中活性逐渐降低的原因。A starch supported palladium catalyst was synthesized and characterized by means of XPS, TG, DTA, TEM etc. The thermal analysis result showed that the catalyst was stable at up to 220 ℃. TEM (confirmed) that the Pd particles were spherical and uniformly distributed, and the average size was 10 nm. The starch supported (palladium) was an (efficient) catalyst for Heck arylation of acrylic acid and styrene with iodoarenes. In the presence of a small amount of the catalyst, the substituted trans-cinnamic acid or trans-stilbene was obtained in air. In the presence of the starch supported palladium, Heck arylation of acrylic acid with (iodobenzene) can be carried out efficiently at a low temperature(80 ℃) and the yield was 81%, indicating the high catalytic activity of the starch supported (palladium(0)). The Pd content decreased to 3.5%, 2.6% and 2.0% respectively when the (catalyst) was repeatedly used three times. This was perhaps the reason why the catalytic activity of the catalyst decreased when used repeatedly.

关 键 词：淀粉 钯 负载型催化剂 HECK反应 

分 类 号：O643[理学—物理化学]