生物还原法制备负载型Pd-Cu合金催化剂及催化Suzuki反应

Synthesis of a Supported Pd-Cu Alloy Catalyst by Bioreduction and Its Catalytic Performance for Suzuki Reaction

以无花果(FL)树叶提取液作为还原剂、稳定剂,以树叶残渣(RFL)为载体,制备了负载型纳米钯铜合金催化剂(Pd Cu/RFL)。采用XRD、FT-IR、TEM、XPS、N_(2)^(-)吸附脱附等手段对制备的PdCu/RFL催化剂进行了表征,并研究了其催化Suzuki偶联反应的性能。Pd_(4)Cu_(1)NPs的粒径分布在2.31~6.62nm之间,平均粒径为3.97nm,均匀地分散在载体RFL表面。Pd与Cu间的电子转移和Pd4Cu1NPs与载体表面上含氧含氮官能团的络合不仅提高了Pd Cu/RFL催化Suzuki偶联反应活性,也改善了催化剂的稳定性。当Pd的加入量为反应底物的0.06mol%时,催化对溴硝基苯和苯硼酸的反应收率可以达到97.00%,催化剂重复使用9次后,收率仍可以保持在93%以上。

A supported nano Pd-Cu alloy catalyst(PdCu/RFL)is synthesized by one-pot method with the ficus carica linn.(FL)leaf extract as reducing agent and stabilizer and the residue of FL leaf as carrier.The prepared PdCu/RFL catalysts are characterized by means of XRD,FT-IR,TEM,XPS,N2-adsorption and desorption,and their catalytic performance for Suzuki coupling reaction is studied.The Pd4 Cu1 NPs uniformly dispersed on the surface of RFL with a particle size distribution from 2.31 nm to 6.62 nm and an average particle size of 3.97 nm.The electron transfer between Pd and Cu and the complexation of Pd4 Cu1 NPs and functional groups containing oxygen and nitrogen on the surface of carrier improves the activity of PdCu/RFL catalyst for Suzuki coupling reaction as well as the stability of catalyst.When the Pd adding amount is 0.06 mol%of the substrate,the yield of reaction between p-bromo-nitrobenzene and phenylboronic acid can reach 97.00%.The yield can still keep above 93%after the catalyst being reused for 9 times.