Homochiral metal-organic frameworks with fine-tuned pore sizes/walls and large surface areas are promising porous materials for enantioseparation considering the traditional zeolite molecular sieves have no chirality. Using enantiopure pyridyl-functionalized salen [(N-(4-Pyridylmethyl)-L-leucine·HBr)] as a starting material, we have prepared a noninterpenetrated three-dimensional homochiral met...

This paper focuses on intra crystalline diffusion of Ni2+ ions onto NaX and NaY zeolites. The zeolites are obtained by the hydrothermal synthesis method. The samples were characterized by several techniques: X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS) and InfraRed Spectroscopy (FT-IR). Physical parameters such as p...

lipase from candida antarctica, fixed on macroporous acrylic resin, has been used for the intermediate production of mono- and diolein by hydrolysis of triolein. the effect of altering concentrations of triolein and glycerol and the function of the molecular sieve on the hydrolysis reaction of triolein were investigated. the highest hydrolysis yield was observed for the utmost concentration of ...

A phillipsite-faujasite tuff (faujasite) from Jordan has been activated and characterized to evaluate its efficiency in removing paraquat from synthetic wastewater and to specify optimum conditions with maximum efficiency of the faujasite tuff. Noticed variation in CEC is indicated and explained by selectivity of the faujasite to K(+) and Na(+). Removal of paraquat by using faujasite directly g...

Abstract The sodium form of Faujasite Y (Na-FAU) zeolite has been synthesized by the hydrothermal method, and it exchanged with ammonium sulphate later lanthanum (III) chloride solutions to obtain La-FAU catalyst. three zeolites Na-FAU, NH 4 + -FAU have characterized microcrystalline X-ray diffraction, fluorescence, surface area, pore volume Brönsted acid sites. catalyst successfully activated ...

With the purpose of development high efficiency catalysts for reactions oxidative conversion lower olefins and paraffins into desired products petrochemical industry it has been synthesized by ion exchange method a range metalzeolite on basis synthetic (NaY) natural (pure dealuminated clinoptilolite mordenite) zeolites cations different metals. It established that prepared zeolite NaY shows rel...

A Monte Carlo replica exchange (MCRE) algorithm was used to compute the sodium cation distribution in bare faujasite zeolite with a number of cations per unit cell ranging from zero (Si:Al f ∞) to 96 (Si:Al ) 1). Eight independent realizations of the system were simulated simultaneously, in the temperature range 3002325 K. The resulting distributions at room temperature were found to be in very...