title: Porous Fe3O4 nanoparticles: synthesis and application in catalyzing epoxidation of styrene.
abstract: A facile route was employed to synthesize porous magnetite via reaction of FeCl(3)·6H(2)O with N(2)H(4)·H(2)O in ethylene glycol without any structure-directing agent. The resultant Fe(3)O(4) particles were characterized by transmission electron microscopy, N(2) adsorption, X-ray photoelectron spectroscopy, and thermal gravimetric analysis. It was demonstrated that the particle size varied in the range of 40-220 nm, and the pore size of particles was centered around 2 nm. The gases produced in the formation process of the particles played key role in the formation of the porous structure. The obtained porous magnetite was used as support to immobilize Au nanoparticles with size less than 2 nm with the assistance of L-cysteine. The as-prepared Fe(3)O(4) particles can effectively catalyze epoxidation of styrene, and the immobilization of Au nanoparticles on the Fe(3)O(4) support significantly improved the activity of the catalyst.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Changliang
authors.initials: C
authors.lastname: Huang
authors.forename: Hongye
authors.initials: H
authors.lastname: Zhang
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Sun
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Zhao
authors.forename: Sha
authors.initials: S
authors.lastname: Chen
authors.forename: Ranting
authors.initials: R
authors.lastname: Tao
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Liu