摘要
以氯化钯(PdCl2)/硅胶负载水相催化剂(SAPC)为对象,研究了浸渍法制备的SAPC在碘代苯和丙烯酸Heck芳基化反应合成肉桂酸的催化活性.主要考察了SAPC中水的质量分数,PdCl2负载量,反应温度,反应时间等因素对肉桂酸产率的影响,结果表明,SAPC催化活性与均相反应结果极其相近;当负载量为7.0 mg-PdCl2/g-硅胶,水的质量分数为7.0%,反应温度95℃,反应时间6 h时,肉桂酸产率较高,达到86.1%.从催化剂活性组分流失研究结果可知,经过简单固液分离得到的催化剂再浸渍后可再循环使用,但催化剂活性下降可达10%,其原因可能是PdCl2在溶剂中的溶解流失、水的蒸发等原因引起.
The catalytic activity of the supported aqueous-phase catalyst （SAPC, PdCl2/SiO2） prepared by impregnation in Heck reaction was studied. The results showed that the yield of cinnamonic acid would reach the maximum value 86.1% when the PdCl2 load was 7.0 mg/g-SiO2, the water content 7.0%, the reaction temperature 95℃, the reaction time 6h, which was very close to the yield in the homogeneous reaction. The study of the loss of the catalytic active com- ponent indicated that the decrease of the catalytic activity would reach 10% when the recovered SAPCs impregnateci again were reused. It was owing to the dissolution of PdC12 in the organic solvent and the loss of the water by evaporation in SAPC.
出处
《浙江工业大学学报》
CAS
2007年第2期171-174,共4页
Journal of Zhejiang University of Technology
基金
浙江省教育厅科技项目(20030147)
