Preparation of magnetic γ-Al2O3 supported palladium catalyst for hydrogenation of nitrobenzene

✍ Scribed by Yuqi Lang; Qiaoqiao Wang; Jianmin Xing; Bo Zhang; Huizhou Liu

• Publisher: American Institute of Chemical Engineers
• Year: 2008
• Tongue: English
• Weight: 443 KB
• Volume: 54
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.11553

✦ Synopsis

Abstract

Spherical alumina support with magnetic core of 134 nm in diameter was prepared by the controlled hydrolysis of aluminums iso‐propoxide. The magnetite Fe~3~O~4~ nanoparticles were first synthesized by coprecipitation. Later silica film was coated onto the surface of Fe~3~O~4~ nano particles with the sodium silicate acidification method. Alumina was supported on Fe~3~O~4~/SiO~2~ film by the controlled hydrolysis of aluminum alkoxide in a dilute solution consisting of cyclohexane and 2‐propanol. Finally, magnetic alumina supported palladium catalysts were prepared by microemulsion method. The surface morphology and crystal structure of the magnetic alumina and catalysts were characterized by XRD, TEM, BET, and VSM, respectively. The results showed that these kinds of composite particle exhibit superparamagnetic behavior with zero coercivity and remanence. The catalysts show high activity for nitrobenzene directly hydrogenating to aniline under mild conditions. © 2008 American Institute of Chemical Engineers AIChE J, 2008