T1 - Synthesis of MCM-41 materials: An in situ FTIR study

The use of the Au/Me-MCM-41 materials as catalysts in the CO oxidationreaction has led to the following observations: (i) catalyst on metal-containingsupports showed better activity than those on Si-MCM-41, probably due to theinduced reducibility in metal-MCM-41, (ii) catalysts prepared by direct synthesisshowed inferior activity owing to large Au particles, (iii) increasing Au contentimproves the catalytic performance, (iv) increasing the Fe content of the support at constant Au improves the catalytic performance, and (v) changing the basemetal component of the support from Fe to Co led to a significant improvement incatalytic activity.

Eco-friendly synthesis for MCM-41 nanoporous …

Synthesis of high-quality MCM-48 and MCM-41 by means of the GEMINI surfactant method.

Synthesis of MCM-41 with Different Pore Diameters …

N2 - A novel MCM-41-supported base catalyst, Ba-MCM-41, was synthesized with a modified impregnation method. Ba2SiO4 was synthesized on the MCM-41 pore wall as confirmed by characterization using X-ray diffraction, X-ray photoelectron spectroscopy, X-ray fluorescence, N2 adsorption, 29Si MAS NMR and transmission electron microscopy. It was also demonstrated that a highly ordered Ba-MCM-41 catalyst with high barium loading (4.1-25.2 wt.%) and dispersion was obtained using this method. The basicity of the catalyst, which was characterized according to the binding energy of O 1s, was increased with increasing amounts of barium in the catalyst.

Synthesis of [Si]-MCM-41 from TEOS and water glass: …

(2012)Synthesis of "Clickable" SBA-15 and MCM-41 mesoporous materials and their applications in catalysis and bio-catalysis. PhD thesis, CSIR-National Chemical Laboratory, Pune, India.

MCM-41 Ordered Mesoporous Molecular Sieves Synthesis

N2 - Cyclopentadiene trimer (tricyclopentadiene) is an important raw material during the synthesis of high-energy-density fuel. In this study, tricyclopentadiene was synthesized through a [4+2] cycloaddition between endo-dicyclopentadiene and cyclopentadiene over microporous zeolites (ZSM-5, HY) and mesoporous Al-MCM-41 catalysts. The catalytic activity was strongly influenced by the average pore size and the Brönsted acidity of the catalyst. Of the tested catalysts, the NH4F-treated Al-MCM-41 catalyst, which had meso-sized pores (3.4 nm in average) and enhanced Brönsted acidity, exhibited the best dicyclopentadiene conversion, tricyclopentadiene selectivity and yield. The average pore size of the catalyst also influenced the isomer distribution of the tricyclopentadiene products: the mesoporous catalysts produced mixtures of exo- and endo-tricyclopentadiene, which favored the exo-fraction (approximately 40 mol%) compared to the microporous catalysts (approximately 20 mol%). The differences in the reaction pathways followed by the zeolites and Al-MCM-41 catalysts were discussed. To investigate the structural and acidic properties of the catalysts, various characterization techniques were applied, such as low-angle X-ray diffraction, N2 adsorption-desorption, ammonia temperature-programmed desorption, and Fourier transform-infrared spectroscopy of adsorbed pyridine.

Synthesis of NH2/MCM-41 Catalysts Using Silica of …

Cyclopentadiene trimer (tricyclopentadiene) is an important raw material during the synthesis of high-energy-density fuel. In this study, tricyclopentadiene was synthesized through a [4+2] cycloaddition between endo-dicyclopentadiene and cyclopentadiene over microporous zeolites (ZSM-5, HY) and mesoporous Al-MCM-41 catalysts. The catalytic activity was strongly influenced by the average pore size and the Brönsted acidity of the catalyst. Of the tested catalysts, the NH4F-treated Al-MCM-41 catalyst, which had meso-sized pores (3.4 nm in average) and enhanced Brönsted acidity, exhibited the best dicyclopentadiene conversion, tricyclopentadiene selectivity and yield. The average pore size of the catalyst also influenced the isomer distribution of the tricyclopentadiene products: the mesoporous catalysts produced mixtures of exo- and endo-tricyclopentadiene, which favored the exo-fraction (approximately 40 mol%) compared to the microporous catalysts (approximately 20 mol%). The differences in the reaction pathways followed by the zeolites and Al-MCM-41 catalysts were discussed. To investigate the structural and acidic properties of the catalysts, various characterization techniques were applied, such as low-angle X-ray diffraction, N2 adsorption-desorption, ammonia temperature-programmed desorption, and Fourier transform-infrared spectroscopy of adsorbed pyridine.

Synthesis and characterization of colloidal MCM-41 - …

AB - Iron-substituted MCM-41 materials (Fe-MCM-41) have been synthesized via a hydrothermal method with in situ incorporation of Fe(III) oxalate complex under various basic conditions. The resulting Fe-MCM-41 samples were characterized by X-ray diffraction, N2 adsorption measurement, and UV-Vis spectrometry. By controlling initial synthesized pH, the Fe-MCM-41 with highly ordered hexagonal mesoporous structures and high iron content (Si/Fe = 20) could be obtained. The iron species in Fe-MCM-41 samples mainly coexisted in isolated iron and highly dispersed iron oxide nanoclusters. Activity and stability of the obtained catalyst were evaluated on the wet peroxide oxidation of phenol under mild reaction conditions (