For polycrystalline specimens of zeolites treated to thermal oxidation we have revealed and studied the weak spectra of reproducible magnetic microwave absorption fluctuations at a frequency of 9.4 GHz. The investigation was carried out by the ESR method over the 77-500 K temperature range. The fluctuation spectra have features typical of mesoscopic phenomena observed previously in ESR spectra ...

Evaluation of various water models for simulation of adsorption in hydrophobic zeolites J. M. Castillo ab; D. Dubbeldam c; T. J. H. Vlugt b; B. Smit d; S. Calero a a Department of Physical, Chemical, and Natural Systems, University Pablo de Olavide, Seville, Spain b Process and Energy Laboratory, Delft University of Technology, Delft, The Netherlands c Chemical and Biological Engineering Depart...

background aromatic organic solvents are extensively used in various industries. xylene is a colorless, transparent liquid, with the characteristic odor of the aromatic hydrocarbons family, which is widely used in industries. adsorption is a conventional method of purifying polluted air containing volatile organic compounds (vocs). zeolite has many unique properties such as high capacity, molec...

An IARC working group of 19 experts in chemical carcinogenesis and seven industrial or governmental observers met in October 1996 in Lyon to prepare updated monographs and evaluations on crystalline and amorphous silica, palygorskite (attapulgite), sepiolite, and wollastonite. Monographs on these agents were published previously in Volume 42 of the IARC Monographs (1). Also evaluated by the gro...

The saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H+ to Li+, Na+, K+, Rb+ and Cs+-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was evaluated at different pH-pM, where pH-pM is equal to log {(M+)/(H+)} and M+ represents either Li...

The applicability of a recently proposed force field of Calero et al. (J. Am. Chem. Soc., 2004, 126, 11377) to Na-MOR zeolites is evaluated. The Henry law coefficients of ethane and C(5)-C(9) as well as the adsorption isotherms of ethane, propane, butane, and hexane in various Na-MOR zeolites are computed and compared with experimental values. These comparisons show that the new force field is ...

This study deals with influence of 1vol% and 2 vol% zeolites to survival of Salmonella typhimurium, S. seftenberg and indicator bacteria (psychrophilic, mesophilic, coliform and faecal coliform) in the solid fraction of pig slurry from agricultural wastewater treatment plant. PVC bottles with openings served as test carriers. In solid fraction with 1 vol% zeolites S. typhimurium survived for 9 ...

Nanoporous acid catalysts such as zeolites form the backbone of catalytic technologies for refining petroleum. With the promise of a biomass economy, new catalyst systems will have to be discovered, making shape-selective base catalysts especially important because of the high oxygen content in biomass-derived feedstocks. Strongly basic zeolites are attractive candidates, but such materials are...

Low silica zeolites are synthesized generally by sol-gel method in water. In this study, efforts were made to prepare low silica zeolites from sodium aluminate and sodium silicate, in the presence of alcohols, at 373 K under an atmospheric pressure. It was of our special interest to investigate how the addition of various alcohols into water affects the type of zeolites synthesized during cryst...

Zeolites are crystalline hydrated tektoalumosilicates consisting of a three-dimensional framework of SiO4 4and AlO4 5tetrahedra linked through shared oxygen atoms. The heulandite group of zeolites including clinoptilolite are the most abundant zeolites in nature 1, 2 . Clinoptilolite is used in a wide range of industrial and agricultural applications, particularly in animal nutrition. Dietary i...