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: In this paper, the immobilization of tetraphenylporphyrinatomanganese(III) chloride, (MnPor), onto imidazole functionalized MCM-41 with magnetite nanoparticle core was described.
41 citations
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TL;DR: In this paper, a nickel-supported mesoporous support for tetralin hydrogenation at high hydrogen pressures (6.0 MPa) has been proposed, which is suitable for attaining a high loading of metallic nickel with a suitable degree of dispersion.
Abstract: Catalysts based on nickel supported on zirconium-doped mesoporous silica, with nickel loadings of 15 and 30 wt.%, have been prepared, characterized and tested in the hydrogenation of tetralin at high hydrogen pressures (6.0 MPa). The zirconium-doped mesoporous silica, used as support, is revealed as appropriate for attaining a high loading of metallic nickel with a suitable degree of dispersion, although the large metallic particles are located on the external surface of the support. These catalysts are very active in the hydrogenation of tetralin at 350 ◦ C, specially that with the highest nickel content, with no deactivation by coke deposition. Concomitantly, the mild acidic nature of these catalysts favor the ring-opening of the tetralin molecules, up to 28% of cracking products at moderate temperatures are detected and the amount of volatile compounds is almost negligible under these experimental conditions. © 2002 Elsevier Science B.V. All rights reserved.
41 citations
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TL;DR: In this article, a hybrid organic-inorganic material was prepared by surface initiated controlled/living radical polymerization (CRP) of styrene in the internal space of a MCM-41 silica.
Abstract: A hybrid organic–inorganic material was prepared by surface initiated controlled/“living” radical polymerization (CRP) of styrene in the internal space of a MCM-41 silica. The inorganic precursor was synthesized, via sol–gel, using tetraethoxysilane and cetyltrimethylammonium bromide, in the presence of ammonia and ethanol to induce the formation of submicrometric spherical particles. After characterization by powder X-ray diffraction (XRD), transmission electron micrography (TEM), scanning electron micrography (SEM), N2 adsorption and titration of the surface silanol groups, the mesoporous silica was functionalized through a 3-step grafting process, in order to link the nitroxide initiator to the inorganic matrix (TEMPO-MCM-41). The anchorage of the TEMPO-based initiator was checked by diffuse reflectance infrared spectroscopy (DRIFT-IR). Experimental data confirmed that the styrene polymerization occurred inside the MCM-41 channels system.
41 citations
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TL;DR: Mesoporous (MCM-41 type) silica containing surfactant-embedded Congo Red has been prepared and tested against gas phase HCl and ammonia, as well as solutions of ionic species.
41 citations
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TL;DR: In this article, the mesoporous molecular sieve Al-MCM-41 with Si/Al ratio = 5 was in situ synthesized under hydrothermal condition using tetraethylorthosilicate (TEOS) and metakaolin as silica and aluminum sources and cetyl trimethylammonium bromide as structure directing agent.
41 citations