The preparation and characterization of a set of periodic mesoporous organosilicas (PMOs) that contain different fractions of 1,3-bis(3-trimethoxysilylpropyl)imidazolium chloride (BTMSPI) groups uniformly distributed in the silica mesoporous framework is described. The mesoporous structure of the materials was characterized by powder X-ray diffraction, transmission electron microscopy, and N(2) adsorption-desorption analysis. The presence of propyl imidazolium groups in the silica framework of the materials was also characterized by solid-state NMR spectroscopy and diffuse-reflectance Fourier-transform infrared spectroscopy. The effect of the BTMSPI concentration in the initial solutions on the structural properties (including morphology) of the final materials was also examined. The total organic content of the PMOs was measured by elemental analysis, whereas their thermal stability was determined by thermogravimetric analysis. Among the described materials, it was found that PMO with 10% imidazolium content is an effective host for the immobilization of perruthenate through an ion-exchange protocol. The resulting Ru@PI-10 was then employed as a recyclable catalyst in the highly efficient aerobic oxidation of various types of alcohols.
Preparation, characterization and catalytic application of a novel ordered mesoporous organosilica-titania with ionic liquid framework (ILNOS-Ti) is developed. The ILNOS-Ti was prepared by surfactant directed simultaneous hydrolysis and condensation of alkyl-imidazolium ionic liquid and tetramethoxysilane followed by treatment with tetra-tert-butylorthotitanate (TBOT) under moderate conditions. The chemical and physical properties of the material were investigated using TG, EDX, DRIFT, TEM, SEM, small angle XRD and nitrogen adsorption-desorption analyses. The ILNOS-Ti was applied as efficient nanocatalyst for the green oxidation of alcohols in the presence of hydrogen peroxide under mild conditions. The corresponding carbonyl products were obtained in high yield. The stability, recoverability and reusability of the designed nanocatalyst were also studied under applied reaction conditions.
In the present study, a novel thiol-functionalized ionic liquid based periodic mesoporous organosilica (PMO-IL-SH) is prepared, characterized and its efficiency for the removal of mercury and lead ions from aqueous solutions is investigated.
A highly active catalyst based on perruthenate ions supported inside the channels of periodic mesoporous organosilica with a bridged imidazolium ionic liquid framework (Ru@PMO‐IL) was developed. The material was found to be an efficient, durable, and recoverable catalyst for the oxidative dehydrogenation of various types of amines such as benzylic, aliphatic, and cyclic aliphatic amines under mild reaction conditions. The products were obtained in excellent yields with excellent selectivities.
Titanium was incorporated in ionic liquid based periodic mesoporous organosilica to prepare a nanostructured catalyst (Ti@PMO‐IL) with high activity. Procedure for the synthesis of Ti@PMO‐IL was followed according the simultaneous hydrolysis and condensation of alkylimidazolium ionic liquid, tetramethoxysilane (TMOS) and tetrabutylorthotitanate (TBOT) where a surfactant template was used together with a simple acid‐based catalytic aproach. N2 adsorption isotherm of the Ti@PMO‐IL was studied to measure its mean pore volume, pore size distribution and specific surface area. Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was applied to identify the chemical bonds present in Ti@PMO‐IL. The morphology of this nanomaterial was investigated by scanning electron microscopy (SEM). Transmission electron microscopy (TEM) image was used to study mesoporosity and structure order of the catalyst. The catalytic activity of Ti@PMO‐IL was then studied and found to be efficient and reusable to catalyze Hantzsch reaction.
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