Water-soluble palladium nanoparticles as an active catalyst for highly selective hydrogenation of nitrobenzene to aniline

作者：Huang, Changru; Wang, Xiaoyan; Yu, Fengli; Yuan, Bing; Xie, Congxia^*; Yu, Shitao

来源：Research on Chemical Intermediates, 2018, 44(1): 13-26.

DOI：10.1007/s11164-017-3088-z

• Selective hydrogenation
• Pd nanoparticles
• P123 micelles
• Aqueous phase
• Nitrobenzene

Palladium (Pd) nanoparticles (NPs) stabilized by tri-block copolymer polyoxyethylene-polyoxypropylene-polyoxyethylene (P123) micelles were synthesized in water using a hydrogenation reduction method. Well-dispersed P123 micelles in the aqueous phase favored the stabilization of Pd NPs. The P123-Pd micellar catalyst was first applied in the liquid phase hydrogenation of nitrobenzene (NB), showing excellent catalytic activity, and the only reaction product detected was aniline (AN). Using water as the reaction medium and under mild conditions, both the preparation of catalysts and NB hydrogenation were convenient and environmentally friendly. Under the optimal conditions, the isolated catalyst phase could be recycled at least five times, and the catalytic activity and selectivity remained unchanged. A reaction scheme was suggested. First-order kinetics was determined at 3.0 MPa hydrogen pressure and temperature 30-75 A degrees C, and the activation energy was 40.18 kJ mol(-1). This work provides an environmentally benign and effective method for the hydrogenation of NB to AN.

• 出版日期2018-1
• 单位青岛科技大学