摘要
为提高金属Rh纳米颗粒的催化性能,采用微波辅助加热法,以乙酰丙酮铱[Rh(acac)3]为前驱体、三缩四乙二醇(TEG)为溶剂和还原剂、KI和正丁胺(BA)为复合形貌控制剂、聚乙烯吡咯烷酮(PVP)为稳定剂,控制合成Rh纳米颗粒的形貌,并考察其催化硝基苯加氢的性能。结果表明,微波辐照80 s可成功制得形貌单一的超支化多级Rh纳米晶;反应体系中,最适宜n[Rh(acac)3]∶n(PVP)∶n(KI)∶n(BA)为1∶10∶10∶0.075;所制备的超支化多级Rh纳米晶催化硝基苯加氢,在50℃、0.5 MPa的H2压力下反应4 h,硝基苯转化率为100%,苯胺选择性为99.9%,重复使用5次催化效率不变。可见,采用微波法可快速合成超支化多级Rh纳米晶,且所合成的超支化多级Rh纳米晶表现出高的催化活性、选择性和良好的重复使用性。
To gain a higher catalytic performance,Rh nanoparticles with a definite morphology are synthesized with Rh(acac)3 as a precursor,tetraethylene glycol(TEG)as both a solvent and a reducing agent,KI and n-butyl amine(BA)as morphology-controlling agents,and polyvinylpyrrolidone(PVP)as a stabilizer by means of microwave-assisted heating method.The catalytic performance of the prepared Rh nanoparticles for the hydrogenation of nitrobenzene is investigated.The results demonstrates that hyperbranched hierarchical Rh nanodendrites with a uniform morphology are prepared successfully under microwave irradiation for 80 s in a reaction system with an optimal n(Rh(acac)3)∶n(PVP)∶n(KI)∶n(BA)of 1∶10∶10∶0.075.Nitrobenzene is hydrogenated over the as-prepared hyperbranched hierarchical Rh nanodendrites at 50℃and 0.5 MPa H2 for 4 h,which delivers a 100%conversion of nitrobenzene and a 99.9%selectivity of aniline.The catalytic efficiency of the nanodendrites remains unchanged after 5 times of reuse.It can be seen that the hyperbranched hierarchical Rh nanodendrites can be synthesized rapidly by microwave method,and shows high catalytic activity,selectivity and good reusability.
作者
方园
张明明
陆颖
赵燕熹
黄涛
FANG Yuan;ZHANG Ming-ming;LU Ying;ZHAO Yan-xi;HUANG Tao(Key Laboratory of Catalysis and Energy Materials Chemistry of the Ministry of Education&Hubei Provincial Key Laboratory of Catalysis and Materials Science,South-Central University for Nationalities,w uhan 430074,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第5期99-103,共5页
Modern Chemical Industry
基金
国家自然科学基金资助项目(21273289)。
关键词
铑
纳米枝晶
微波
硝基苯
加氢
rhodium
nanodendrite
microwave
nitrobenzene
hydrogenation
