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Facile Synthesis of Fe-Loaded Mesoporous Silica by a Combined Detemplation−Incorporation Process through Fenton’s Chemistry

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posted on 2008-10-23, 00:00 authored by Yong-Mei Liu, Jie Xu, Lin He, Yong Cao, He-Yong He, Dong-Yuan Zhao, Ji-Hua Zhuang, Kang-Nian Fan
The present work describes a new approach to synthesize Fe species within the channels of mesoporous SBA-15 silica using Fenton’s reagent (Fe2+-H2O2) as an iron precursor. For the first time Fe ions were incorporated within as-synthesized surfactant-containing mesoporous host by a simultaneous detemplation and Fe-incorporation process at low temperature. The resulting materials were characterized by X-ray diffraction (XRD), thermogravimetric differential thermal analysis, N2 sorption, DRIFTS, transmission electron microscopy (TEM), UV−vis diffuse reflectance spectroscopy, UV Raman, X-ray photoelectron spectroscopy, and Friedel−Crafts alkylation catalysis. The ordered mesostructure of the SBA-15 host is retained as indicated by XRD and HRTEM, and the surface areas of the Fe-SBA-15 materials are in the range of 640−853 m2 g−1 comparable to 784 m2 g−1 for the calcined host. The characterization results also indicate the presence of iron species inside the silica pores, as well as a good dispersion of the iron oxide nanoclusters within the pores of the host material. Controlled iron loading was possible to a maximum of 9 wt %. The catalyst shows significantly enhanced performance on benzylation of benzene using benzyl chloride as the alkylating agent compared to conventionally prepared Fe/SBA-15.

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