This work aims at the reutilization of a Cr-loaded NaY zeolite obtained by biorecovery of chromium from water as catalyst in the oxidation of volatile organic compounds (VOC). Cr-NaY catalysts were obtained after biosorption of Cr(VI) using a bacterium, Arthrobacter viscosus, supported on the zeolite. The biosorption experiments were conducted at different pH values in the range 1-4. The cataly...

− N,N’-Bis(salicylidene)ethylenediiminocobalt (Cosalen) was encapsulated into the supercage of microporous NaY zeolite via “ship-in-a-bottle” technique. The impregnated Cosalen complex immobilized on the outer surface of the zeolite was also prepared in order to further prove the encapsulation by the flexible ligand method. The samples were characterized by FT-IR, UV-Vis, XRD, TG/DTA and SEM te...

The hydrolysis of nitriles in presence of NaY zeolite under microwave irradiations gives corresponding amide in high yield in few minutes.

A bimetallic precursor route toward the encapsulation of subnanometer tin-transition metal alloy clusters in zeolites is presented. The intrazeolite chemistry and thermal stability of MesSnCo(CO)4 in NaY zeolite were studied with X-ray absorption spectroscopy (Sn, Co edge EXAFS) and in-situ FTIR/TPD-MS techniques. In the NaY host, the intact precursor is physically adsorbed from hexane solution...

zeolite fau type-y is one of the most studied framework of all zeolites, and has been used as catalysts for number of reactions in the refinery and petrochemical industry. in this research, nanocrystalline zeolite y was synthesized by hydrothermal method. the crystal size of zeolite y is influenced by temperature, aging time, alkalinity, and water content. the synthesized zeolite nay is identif...

The results of X-band EPR, X-ray absorption and Fourier transform infrared spectroscopy on Pt(NH(3))(4)(2+) exchanged NaX, NaY and NaA zeolites reveal after oxygen calcination at 573 K that diamagnetic Pt(2+) is not the only product. Calcination provides Pt(3+) cations, but depending on the heating rate, the decomposition of amino groups during calcination also produces hydrogen that reduces Pt...

in this work, zeolite nay was prepared by hydrothermal method. then, silver ions were replaced in the zeolite nay with silver nitrate (agno3) solution via using ion exchange (ie) method. the manganese dioxide (mno2) nanoparticles (9.3 and 15.8 wt %) for guest were deposited in the zeolite agy(host) structure with mn(no3)2 aqueous and kmno4 solutions by confined space synthesis (css) method. syn...

Recently, hybrid materials using poly ethylene glycol and porous nanocrystals have been developed for drug release. In this study, a series of poly ethylene glycol (PEG)/NaY zeolite and PEG/MCM-41 nanocomposites get synthesized. These materials are characterized using FT-IR spectroscopy, XRD, TGA and SEM. After loading the metronidazole onto these nanocomposites, the release of Metronidazole wa...

Dye-exchanged Y zeolite is shown to be an effective medium to control the stereoselectivity in the photooxygenation of chiral oxazolidinone-functionalized Z/E-1 enecarbamates. An enantioselectivity (ee) as high as 80% was observed in the methyldesoxybenzoin (MDB) product, obtained in the methylene-blue-exchanged NaY zeolite at room temperature. The efficacy of the asymmetric induction in the MD...

background: formaldehyde is one of the most serious air contaminant that can be found everywhere. some of the source of formaldehyde include product of building materials, decorated materials, cigarette smoke, etc. aldehydes compounds especially formaldehyde are used as disinfectants for sterilization in different industries. in this study we measured formaldehyde workplace exposure with niosh ...