光沉积法Cu-P25制备及催化二乙醇胺N-甲基化性能

Preparation of Cu-P25 by Photodeposition Method and Its Catalytic Performance for N-Methylation of Diethanolamine

以硝酸铜为铜源,二氧化钛(P25)为光活性载体,采用光化学沉积法合成了系列不同铜负载率的Cu-P25颗粒。以405 nm波长的发光二极管(LED)为光源,考察了原生Cu-P25颗粒光催化二乙醇胺(DEA)和甲醇的多步N-甲基化反应。研究结果表明:载体恒定为0.5 g条件下,Cu在P25上的最佳负载率为w(Cu)=0.3%,相应的原生Cu(0.3)-P25(0.5)颗粒催化N-甲基化反应的收率为45.4%。P25颗粒可显著提高原生Cu-P25颗粒的光催化性能。P25颗粒与原生Cu(0.3)-P25(0.5)颗粒的最佳复合质量比为2∶1,相应的复合光催化剂Cu(0.3)-P25(0.5)/P25(1.0)催化N-甲基化反应的收率可达81.7%。

A series of Cu-P25 particles with different copper loading level were prepared via photodeposition method by using copper nitrate as copper source and P25(TiO2)as photoactive carrier.Under the irradiation of 405 nm light emitting diode(LED),the catalytic performance of the obtained original Cu-P25 particles toward the tandem N-methylation reaction of diethanolamine(DEA)with methanol was investigated.The results show that under the condition of constant 0.5 g carrier,the optimal loading rate of Cu on P25 carrier is w(Cu)=0.3%,and the corresponding original Cu(0.3)-P25(0.5)particles exhibit a N-methylation yield of 45.4%.Compositing with P25 particles can significantly improve the catalytic performance of the original Cu-P25 particles.The optimal compositing ratio of P25 particles to Cu(0.3)-P25(0.5)particles in mass is 2∶1,and the corresponding composite photocatalyst Cu(0.3)-P25(0.5)/P25(1.0)can give a Nmethylation yield of 81.7%.