MCM-41

About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.

Copper(I)‐N2S2‐salen type complex covalently anchored onto MCM‐41 silica: an efficient and reusable catalyst for the A3‐coupling reaction toward propargylamines

Abstract: The immobilization of copper complexes by covalent anchoring of the ligand on the surface of mesoporous MCM-41 has been described. Bis[2-(phenylthio)benzylidene]-1,2-ethylenediamine as a new N2S2 donor salen-type ligand was covalently anchored onto nanopores of MCM-41 coordinated with copper (I) halide. The organic–inorganic hybrid material was achieved readily using 3-mercaptopropyltrimethoxysilane as a reactive surface modifier. 2-Nitrobenzaldehyde was reacted smoothly with the thiol moieties in order to form functionalized nanoporous silica with carbaldehyde groups. The resulting supported organic moieties were converted to thiosalen ligand and coordinated with CuX (X = CN, Cl, Br, I). Characterization of the heterogeneous catalyst by X-ray diffraction, N2 sorption, FT-IR, diffuse reflectance UV-visible and TGA techniques indicated successful grafting of the copper complex inside the nano-channels of MCM-41. The heterogenized catalyst was evaluated by the Mannich condensation reaction of aldehydes, amines and alkynes. In this reaction, the corresponding propargylamines were obtained as single products in good to excellent yields. Factors such as reaction temperature, solvent, catalyst loading, leaching and reusability of the catalyst also were discussed. The use of MCM-41 as support permits an easier separation and recycles with only a marginal decrease in reactivity. Copyright © 2013 John Wiley & Sons, Ltd.

Biodiesel production from Hevea brasiliensis oil using SO3H-MCM-41 catalyst

Abstract: The use of Hevea brasiliensis oil (para rubber seed oil) as a biodiesel feedstock was achieved under high pressure in an autoclave reactor using a methyl propyl sulfonic acid-functionalised MCM-41 catalyst (SO3H-MCM-41). Four experimental parameters, namely catalyst loading, reaction time, reaction temperature, and the molar composition of 3-mercaptopropyl(methyl)dimethoxysiloxane, were investigated using the Box–Behnken design. The optimisation model showed good statistical reliability, with a linear correlation coefficient close to 1. Under the optimum reaction conditions (5.06 wt% catalyst loading, 120 min, 153 °C, and 0.266 of MPMDS molar composition), the highest predicted and experimental fatty acid methyl ester yields were 96.6% and 95.5%, respectively. The catalyst was benchmarked against a commercial homogeneous catalyst (H2SO4) and proven to be more effective. Moreover, the catalyst could be reused up to four cycles under the optimum reaction conditions without significant loss of product yield.

Highly active and moisture‐insensitive solid catalysts – GaCl3 and InCl3 supported on montmorillonite‐K10 and Si‐MCM‐41 for benzylation of benzene

Abstract: InCl3 and GaCl3 supported on montmorillonite‐K10 or on high silica mesoporous MCM‐41 show very high activity in the benzylation of benzene by benzyl chloride (at 80°C) with little or no effect in the presence of moisture in the catalyst or in the reaction mixture on their benzylation activity; the supported InCl3 catalyst shows superior performance in the benzylation reaction in regard to both the activity and moisture insensitivity.