Current Catalysis - Volume 3, Issue 1, 2014

Fe-exchanged zeolites show great promise for the direct benzene hydroxylation to phenol, one of the most important industrial chemicals. In this review, the recent achievements on the active sites and benzene hydroxylation have been summarized and discussed. Firstly, the catalytic results that are assumed in absence of Fe ions are given; secondly, the indispensible role of Fe ions has been revealed. Four types of Fe-involve Read More

Energy processing and fuel combustion processes generate large volumes of CO, NOx, SO2, and volatile organic compounds (VOCs). These pollutants may pollute the air and water, thus doing harm to humans, animals, plants, and buildings. Heterogeneous catalysis plays an important role in environmental remediation. Catalytic elimination of environmental pollutants is more efficient and effective than conventional inci Read More

Ethyl 2-(4-aminophenyl) acetate is an important intermediate in the synthesis of Actarit, an antiarthritic drug. In the present study, synthesis of ethyl 2-(4-aminophenyl) acetate using Novozyme 435 in toluene as a solvent has been carried out under both conventional heating and microwave irradiation. A number of commercially available lipases such as Novozyme 435, Lipozyme RM IM and Lipozyme TL IM were screened. No Read More

Iron(III) chloride adsorbed on silica gel catalyzes the photodecomposition of dichloromethane under near-UV irradiation, functioning through photodissociation to produce chlorine atoms that initiate a radical chain. While the photocatalytic activity under these conditions is similar to that of FeCl4macr heterogenized on an ion exchange resin, under solar irradiation the FeCl3/silica system is considerably more effective.

Fluoride-free Hiyama cross-coupling reactions of phenyltrimethoxysilane with aryl halides were performed in water using sodium hydroxide as the activator at 110 °C. The reactions, catalyzed by PVP stabilized colloidal palladium nanoparticles, show enhanced rate under microwave heating and proceed quickly (6 min).The progress of the reactions was monitored by GC-MS and parameters such as catalyst concentration, effect o Read More

Revisiting the iodine mediated N-Boc (N-tert-butoxycarbonyl) protection of amines revealed that the reaction can be performed using a lower quantity of iodine as a catalyst within a shorter reaction time. In addition to various aliphatic and aromatic amines the reaction was found to be equally effective and selective for the N-Boc protection of amino acid, guanidine, thiourea and N-(diaminomethylene)-1,1,1-trifluoromet Read More

Sulfonated carbon/silica composites derived from biomaterials viz. glucose, maltose, cellulose, chitosan and starch exhibited high catalytic activity for the one-pot synthesis of Hantzsch 1,4-dihydropyridines under solvent-free conditions, and for one-pot synthesis of 2,4,5-trisubstituted imidazoles and 2-arylbenzimidazoles under liquid phase catalysis. The activity of sulfonated carbon/silica composites derived from starch was found Read More

N-alkylation of different amines with benzyl alcohol in the presence of easily prepared heterogeneous catalysts based on ruthenium hydroxide supported on zeolite NaY and Mordenite were investigated. All the reactions showed moderate to excellent yields especially for aliphatic primary amines without the addition of any co-catalysts such as bases and stabilizing ligands. Primary amines were converted into a mixture of s Read More

In this study, benzoin methyl ether and benzoin ethyl ether were highly selectively synthesized in one-pot reaction using the reusable NiAlCe-hydrotalcite catalysts, where the benzoin ether compounds are traditionally obtained in two steps through condensation and etherification. The high crystallinity NiAlCe-hydrotalcites with different Ni2+/Al3+/Ce3+ ratios were facilely synthesized by the coprecipitation method unde Read More

The [RuIII(hedtra)(H2O)] (hedtra3- = N-hydroxyethylethylenediaminetriacetate) mediated oxidative degradation of methylene blue (MB) in the presence of H2O2 has been achieved under ambient conditions. Based on the results of spectral studies a catalytic pathway involving activation of the dye, MB through its coordination to the ruthenium centre of Ru(hedtra) complex has been suggested. The catalytic-active intermedi Read More

Manganese oxide supported on alumina and zirconia has been prepared by precipitation-impregnation method. The materials have been characterized by FT-IR, P-XRD, BET, TPD-NH3, TGA, SEM and TEM techniques for their textural properties. The catalytic activity of these materials has been explored in the synthesis of dihydropyrimidinones via.,Biginelli reaction. A rod like morphology is observed for zirconia containi Read More

The kinetics of silver (I) catalyzed oxidation of l-ascorbic acid (H2A) by peroxodiphosfate (PDP) in acetate buffers has been studied. Triple distilled water was employed to eliminate suspected trace metal-ion catalysis of Cu (II) or Fe (III). The kinetics was monitored ceremetrically and the rate has been found to be independent of substrate concentration. A plausible reaction mechanism has been suggested. Results were analys Read More

Polyethylene glycol (PEG) nanotubes with an array structure were prepared by penetrating a PEG solution into anodic aluminum oxide (AAO) templates with a pore diameter of 200 nm. Nitrogen-doped carbonaceous nanotubes array were also successfully fabricated by annealing the polymer nanotube arrays in NH3 atmosphere. Their morphology and structure were charactarized by XRD, SEM, TEM, and XPS respectiv Read More

Photocatalyzed decolorization of an azo dye Acid Yellow 29 has been examined under UV -light irradiation by monitoring the change in absorption intensity as a function of irradiation time under a variety of conditions. The reaction was carried out in an immersion well photochemical reactor using titanium dioxide (TiO2) as photocatalyst. The effect of operating parameters such as catalyst type, catalyst quantity, substrate con Read More