With a novel anionic micelle templating method, Fe2O3 species were in situ formed and highly-dispersed and the pore size tailored to the microporous level (<2 nm). The catalyst exhibited high selectivity for dihydroxybenzene in phenol hydroxylation.
In this study, pony‐sized Copper ferrite (CuFe2O4) nanoparticles were directly obtained and synchronously stabilized on nanoporous carbon nitride (MCN) named as CuFe2O4‐MCN, which emerges interestingly as a magnetically‐recycling heterogeneous Fenton‐like catalyst. The Fourier Transform Infrared, X‐ray diffraction, N2 desorption, X‐ray photoelectron spectroscopy and transmission electron microscopy were seriatim used to characterize these synthesized functional catalysts. These present results demonstrated that CuFe2O4‐MCN afford appreciable physical textural characteristics including well‐defined porous structure, advisable surface area and pore volume. The interaction between CuFe2O4 and MCN and its induced improved dispersion of CuFe2O4 NPs on MCN could be confirmed through XPS, FT‐IR, and TEM evidences. Impressively, the resulted CuFe2O4‐MCN composites exhibited a three times’ catalytic activity (kobs, 0.076 min−1) than that (kobs, 0.026 min−1) of mechanical mixture CuFe2O4‐MCN(M) in 4‐chlorophenol(CP) degradation. CuFe2O4‐MCN porous composites was further evaluated in catalysis according to various controlled parameters, including catalyst loading, H2O2 concentration, catalyst dosage and pH of 4‐CP degradation. At last, the catalytic stability of CuFe2O4‐MCN composites was investigated via magnetic recycling and reusage in next catalytic test. After three successive experimental runs, the porous structure and catalytic activity of CuFe2O4‐MCN catalysts remained constant.
Ordered mesoporous silicas (OMSs) attract considerable attention due to their advanced structural properties. However, for the pristine silica materials, the inert property greatly inhibits their catalytic applications. Thus, to contribute to the versatile surface of OMSs, different metal active sites, including acidic/basic sites and redox sites, have been introduced into specific locations (mesoporous channels and framework) of OMSs and the metal-functionalized ordered mesoporous silicas (MOMSs) show great potential in the catalytic applications. In this review, we first present the categories of metal active sites. Then, the synthesized processes of MOMSs are thoroughly discussed, in which the metal active sites would be introduced with the assistance of organic groups into the specific locations of OMSs. In addition, the structural morphologies of OMSs are elaborated and the catalytic applications of MOMSs in the oxidation of aromatic compounds are illustrated in detail. Finally, the prospects for the future development in this field are proposed.
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