多孔SiO2·xH2O负载RuB纳米粒子催化喹啉加氢反应

doi:10.3866/PKU.WHXB20100901

物理化学学报 >> 2010, Vol. 26 >> Issue (09): 2422-2428.doi: 10.3866/PKU.WHXB20100901

多孔SiO₂·xH₂O负载RuB纳米粒子催化喹啉加氢反应

张磊, 胡博, 陈华, 李贤均, 李瑞祥

四川大学化学学院, 绿色化学与技术教育部重点实验室,成都610064

收稿日期:2010-02-19 修回日期:2010-05-24 发布日期:2010-09-02
通讯作者: 李瑞祥 E-mail:sculiruixiang@163.com
基金资助:
国家自然科学基金(21072138)资助项目

Catalytic Performance of Porous SiO₂·xH₂O Supported RuB Nanoparticles for the Hydrogenation of Quinoline

ZHANG Lei, HU Bo, CHEN Hua, LI Xian-Jun, LI Rui-Xiang

Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China

Received:2010-02-19 Revised:2010-05-24 Published:2010-09-02
Contact: LI Rui-Xiang E-mail:sculiruixiang@163.com
Supported by:
The project was supported by the National Natural Science Foundation of China (21072138).

摘要/Abstract

摘要：

通过水解,聚乙烯吡咯烷酮(PVP)保护, NaOH刻蚀等方法制备了多孔及富含表面羟基的SiO₂·xH₂O 负载的RuB催化剂RuB/SiO₂·xH₂O, 并用X 射线衍射(XRD)、X 射线光电子能谱(XPS)、透射电子显微镜(TEM)、傅里叶变换红外(FT-IR)光谱和BET(Brunauer-Emmett-Teller)等手段对该催化剂进行了表征. 结果表明该催化剂具有良好的抗中毒能力,在3.0 MPa 的H₂压力和80 ℃的温和反应条件下,喹啉的转化率高于95%, 生成1,2,3,4-四氢喹啉的选择性高于97%. 并系统研究了表面羟基和溶剂对催化剂性能的影响, 发现以水为溶剂时, RuB/SiO₂·xH₂O 对喹啉加氢反应展示出较高的活性和对1,2,3,4-四氢喹啉较高的选择性, 催化剂能够多次循环使用. 这一体系的优异催化性能归属于载体表面羟基和水的协同作用.

关键词: 钌, 水合二氧化硅, 喹啉, 加氢, 四氢喹啉

Abstract:

A porous and hydroxyl group-rich catalyst RuB/SiO₂·xH₂O was prepared by hydrolyzing ethyl silicate, protecting SiO₂·xH₂O with polyvinyl pyrrolidone (PVP), and etching SiO₂·xH₂O with NaOH. The catalyst was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier transforminfrared (FT-IR) spectroscopy, and BET (Brunauer-Emmett-Teller). We found that the catalyst showed excellent performance for the hydrogenation of quinoline under mild condition. At a hydrogen pressure of 3.0 MPa and a reaction temperature of 80 ℃, the conversion of quinoline reached 95% and the selectivity for 1,2,3,4- tetrahydroquinoline was 97%. This porous catalyst also showed an excellent anti-poisoning characteristic. The catalyst can be reused several times. We also investigated the effect of surface hydroxyl groups and the solvent on catalytic activity and selectivity. The results showed that using water as a solvent leads to higher catalyst activity and selectivity for the hydrogenation of quinoline. The mechanism of quinoline hydrogenation over the catalyst is discussed. The coordination of the nitrogen on quinoline onto the surface of ruthenium nanoparticles, the effect of hydrogen bond among the surface hydroxyl groups of the catalyst and the nitrogen present in quinoline and in the water solvent were favorable for the adsorption of the substrate and the desorption of the products fromthe surface of the catalyst.

Key words: Ruthenium, /SiO₂·xH₂O, Quinoline, Hydrogenation, Tetrahydroquinoline

MSC2000:

O643

张磊, 胡博, 陈华, 李贤均, 李瑞祥. 多孔SiO₂·xH₂O负载RuB纳米粒子催化喹啉加氢反应[J]. 物理化学学报, 2010, 26(09): 2422-2428.

ZHANG Lei, HU Bo, CHEN Hua, LI Xian-Jun, LI Rui-Xiang. Catalytic Performance of Porous SiO₂·xH₂O Supported RuB Nanoparticles for the Hydrogenation of Quinoline[J]. Acta Phys. -Chim. Sin., 2010, 26(09): 2422-2428.

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多孔SiO₂·xH₂O负载RuB纳米粒子催化喹啉加氢反应

Catalytic Performance of Porous SiO₂·xH₂O Supported RuB Nanoparticles for the Hydrogenation of Quinoline

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