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Preparation of magnetic γ‐Al 2 O 3 supported palladium catalyst for hydrogenation of nitrobenzene
Author(s) -
Lang Yuqi,
Wang Qiaoqiao,
Xing Jianmin,
Zhang Bo,
Liu Huizhou
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11553
Subject(s) - nitrobenzene , coprecipitation , catalysis , superparamagnetism , materials science , palladium , cyclohexane , chemical engineering , coercivity , microemulsion , inorganic chemistry , remanence , magnetization , chemistry , organic chemistry , pulmonary surfactant , physics , quantum mechanics , magnetic field , engineering , condensed matter physics
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