A series of four PdO/SBA-15 catalysts with 1, 2, 4, 5% (by weight) loading of PdO have been prepared by a conventional impregnation method and are characterized by N 2 -adsorption, low-angle and wideangle XRD, XPS and TEM techniques. The catalysts exhibited very high conversion of cyclohexene and high selectivity of cyclohexenone with 70% t-BuOOH in CH 3 CN. The structural and textural characteristics of catalysts play a crucial role in high conversion and selectivity.
Oxidative coupling of benzylamines to N-benzylbenzylimines under base- and additive-free conditions is achieved over AuNPs/SBA-NH2. Facile preparation, high activity, ease of separation and good reusability are the credentials of AuNPs/SBA-NH2 catalyst.
Ni nanoparticles supported on various mesoporous silicas with 2D (COK-12) and 3D architectures (KIT-6 and SBA-16) exhibited superior catalytic performance in the vapor-phase hydrocyclization of biomass-derived levulinic acid at atmospheric pressure.
A RhNPs/SBA-NH2 catalyst with <3 nm sized nanoparticles has been synthesized and used in the chemoselective hydrogenation of nitroarenes at room temperature in aqueous medium with N2H4·H2O with high TOF.
Cu/SBA-15 catalysts with various Cu loadings in the range of 5-20 wt% were prepared by an impregnation method and characterized by N 2 adsorption, X-ray diffraction, temperature programmed reduction and X-Ray photoelectron spectroscopic techniques. Cu/SBA-15 catalysts are found to be highly active and selective for the Beckmann rearrangement of benzaldoxime into benzamide under solvent-free and acid-free conditions.
The catalytic performance of a PdNPs/SBA-COOH has been investigated for the first time in the selective hydrogenation of nitrobenzene with hydrous hydrazine at RT in water medium.
BACKGROUND: Imines are important chemical intermediates for the fine chemical and pharmaceutical industry, particularly as lipoxygenase inhibitors, anti-inflammatory and anti-cancer agents. For the synthesis of imines, the standard protocol is the condensation of carbonyl compounds with amines in Lewis acids. Recently, considerable attention has been paid to oxidation of secondary amines. Subsequently, direct catalytic oxidation of primary amines has been emerging as a key methodology. However, limited studies have been made using Cu, Pd, Ru, Mn, Fe, V, Ti, Nb etc., as catalysts. Herein, nanogold immobilized Santa Barbara Amorphous (SBA-NG) catalyst has been described.
RESULTS: For the synthesis of SBA-NG catalyst, SBA-15 was functionalized with propylamine (SBA-NH 2 ) followed by immobilized nanogold particles using AuCl 3 and NaBH 4 . Structural and textural characteristics of SBA-NG catalyst have been authenticated by low-angle XRD and N 2 sorption techniques. Metallic nature and 2-5 nm sized nanogold have been assessed by wide-angle XRD and TEM analysis respectively. The SBA-NG converted benzylamine into N-benzyl benzaldimine with 98% conversion and 99% selectivity. CONCLUSIONS: Facile preparation, high efficiency, stable activity, no solvent requirement, scope for large scale application are the credentials of SBA-NG catalyst, which are imparted by nanoscale dispersion, confined pore environment, high surface area and minimized diffusion limitations.
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