三苯基膦稳定的负载钌纳米粒子上对氯硝基苯的选择加氢反应  

Supported triphenylphosphine-stabilized ruthenium nanoparticles for p-chloronitrobenzene selective hydrogenation to p-chloroaniline

作　　者：王芳[1,2] 刘俊华[3] 徐贤伦[1] 

机构地区：[1]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]南京师范大学化学与环境科学学院,江苏南京210097

出　　处：《工业催化》2009年第7期49-52,共4页Industrial Catalysis

摘　　要：制备了γ-Al_2O_3负载的三苯基膦稳定的钌纳米粒子(PPh_3-Ru/Al_2O_3)催化剂,并进行了XRD和XPS表征。将其用于对氯硝基苯的选择加氢反应,考察了反应压力、温度和时间对催化性能的影响。结果表明,在60℃、氢压2 MPa、反应21 h和对氯硝基苯几乎完全转化的条件下,实现了产品对氯苯胺99.7%的选择性。分析表明,脱氯反应的抑制是取得产品高选择性的主要原因,阐明了该催化剂如何有效抑制脱氯反应的发生。γ-Al2O3 supported triphenylphosphine-stabilized ruthenium nanoparticle catalyst was prepared and characterized by XRD and XPS. The effect of hydrogen pressure, temperature and reaction time on the hydrogenation of p-chloronitrobenzene over PPh3-Ru/γ-Al2O3 catalyst was investigated. Under the reaction condition of 60℃, hydrogen pressure 2.0 MPa, reaction for 21 h, and p-chloronitrobenzene conversion of 100% , selectivity to p-chloroaniline of 99.7% was obtained. The suppression of dehalogenation reaction was responsible for high selectivity to p-chloroaniline. The reason for the suppression of dehalogenation reaction over PPh3-Ru/Al2O3 catalyst was also clarified.

关 键 词：催化化学 选择加氢 对氯硝基苯 对氯苯胺 钌纳米粒子 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]