Topic
MCM-41
About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.
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TL;DR: Mesoporous chromium-containing silicates of the MCM-41 type (pore size ca. 2.8 nm) with redox catalytic properties are synthesized and characterized as discussed by the authors.
69 citations
TL;DR: In this article, an ordered mesoporous hexagonal materials were prepared by dispersion of ZrOCl 2 ·8H 2 O into the mesopores, followed by the hydrolysis and sulfation.
Abstract: SO 4 2− /ZrO 2 (SZ) supported on ordered mesoporous hexagonal materials were prepared by dispersion of ZrOCl 2 ·8H 2 O into the mesopores, followed by the hydrolysis and sulfation. These materials have been characterized by X-ray diffraction, nitrogen adsorption isotherms, infrared spectroscopy, and catalytic cracking of n -hexane, cumene and 1,3,5-triisopropylbenzene. The results show that SZ was successfully loaded into the inner pores of MCM-41; the as-synthesized catalyst showed favorable catalytic properties. The factors in the preparative process that affected the final activity were discussed.
69 citations
TL;DR: In this paper, ZSM-5 synthesis gels were aged during 18-72h at temperatures between 30 and 90°C and were obtained from gels with diameters around 2.5nm.
69 citations
TL;DR: In this paper, an organic-inorganic hybrid heterogeneous catalyst was synthesized with post-grafting of MCM-41 with 3-aminoropropyltrimethoxysilane and subsequent reaction with 3,4-dihydroxybenzaldehyde and then complexation with oxo-vanadium acetylacetonate salt.
Abstract: Oxo-vanadium(IV) Schiff base complex supported on MCM-41 as an organic–inorganic hybrid heterogeneous catalyst was synthesized with post-grafting of MCM-41 with 3-aminoropropyltrimethoxysilane and subsequent reaction with 3,4-dihydroxybenzaldehyde and then complexation with oxo-vanadium acetylacetonate salt. The catalyst was analysed using a series of characterization techniques such as Fourier transform infrared spectroscopy, small-angle X-ray diffraction, nitrogen absorption isotherm, transmission electron microscopy and thermogravimetric analysis. The data collected provided evidence that the vanadium complex was anchored onto MCM-41. High catalytic activity of this catalyst was observed in the oxidation of various sulfides and thiols (into sulfoxides and disulfides, respectively) with urea hydrogen peroxide as oxidant in high to excellent yields and selectivity under mild conditions. The heterogeneous catalyst could be recovered easily and reused several times without significant loss in catalytic activity and selectivity. Copyright © 2015 John Wiley & Sons, Ltd.
69 citations
TL;DR: In this paper, post-synthetically prepared mesoporous derivatives using titanium butoxide grafting were catalytically active for the selective oxidation of 2,6-di- tert-butylphenol with H 2 O 2.
Abstract: Titanium-substituted mesoporous molecular sieves were prepared post-synthetically by applying Ti-butoxide in ethanol solutions of different concentrations to MCM-41, MCM-48, and KIT-1. The catalysts obtained were characterized by XRD, FT-IR, UV–Vis spectroscopies, XAS, and N 2 physisorption. Incorporation of Ti seems to promote further crosslinking of the mesoporous walls of the samples, and resulted in wall thickness increases. The post-synthetically prepared Ti-mesoporous derivatives using titanium butoxide grafting were catalytically active for the selective oxidation of 2,6-di- tert -butylphenol with H 2 O 2 . Their activities depended on the Ti concentration of the catalysts. Comparison works with hydrothermally prepared Ti-MCM-41, Ti-HMS or post-synthetically prepared Ti-mesopore catalysts, either using titanocene grafting or by TiCl 4 atom planting method, are also reported.
69 citations