Results 141 to 150 of about 1,994 (163)

Thermoanalytical investigation of natural clinoptilolites

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1979
1. Thermoanalytical TG, DTG, and DTA curves have been obtained, first for the natural clinoptilolites from the Nor Kokhb and Khekordzula beds in Armenia and Georgia, and then for modified forms of these minerals prepared by ion-exchange methods. 2.
�. Kh. Anakchyan, M. M. Dubinin, A. A. Isirikyan   +2 more
openaire   +1 more source

Removal of copper and lead by clinoptilolite and clinoptilolite-iron system

2010
The increasing levels of toxic metals (copper, zinc, cadmium, lead, nickel, chromium, etc.) that are discharged to the environment as industrial wastes, represent a serious threat to human health, living resources and ecological systems. Due to their tendency to accumulate in living organisms, causing various diseases and disorders, the treatment ...
Kragović, Milan, Miličević, Sonja, Daković, Aleksandra, Perić, Jelena, Trgo, Marina, Vukojević Medvidović, Nediljka, Ugrina, Marin, Sekulić, Živko, Nuić, Ivona   +8 more
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MOLECULAR SIEVE SORBENTS FROM CLINOPTILOLITE

Canadian Journal of Chemistry, 1964
Clinoptilolite has been investigated as a source of porous, largely crystalline, molecular sieve sorbents. By treating the zeolite with mineral acid of different strengths a range of high area sorbents has been produced, in which all the original cations have been replaced by hydronium ions, and in which the aluminum has been progressively removed ...
R. M. Barrer, M. B. Makki
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Clinoptilolite in South Texas Soils

Soil Science Society of America Journal, 1986
Abstract Clinoptilolite, Ca x (Na,K) 6‐2 x {Al 6 Si 30
Douglas W. Ming, Joe B. Dixon
openaire   +1 more source

Diffusion in ion‐exchanged clinoptilolites

AIChE Journal, 1991
AbstractThe two‐dimensional channel structure of clinoptilolite has been altered systematically by ion exchange to study the effects of cation type, size, location, and distribution on the diffusion of N2 and CH4 probe molecules. Concentration‐dependent diffusion time constants (D/L2) were determined from gravimetric uptake measurements for fully ...
Mark W. Ackley, Ralph T. Yang
openaire   +1 more source

Hydrodemethylation of toluene on clinoptilolite

Journal of Catalysis, 1971
From kinetic studies of the catalytic hydrodemethylation of toluene on clinoptilolite exchanged by K+, Mg2+, and La3+ ions, respectively, the mechanism of the reaction could be deduced. The rate-determining step of the transformation is a surface reaction in which hydrogen from the gas phase reacts with chemisorbed toluene in a presumably four-center ...
openaire   +1 more source

Pressed clinoptilolite and mixed copper-clinoptilolite disk membranes for hydrogen separation

2015
Natural zeolites have crystalline nanopores, which make them suitable as membranes for small molecular separations. Rock sections machined from such deposits have demonstrated the combination of properties yields promising selectivity but these membranes cannot be adequately scaled.
Farjoo, A., Avila, Adolfo María, Kuznicki. S.   +2 more
openaire   +1 more source

Clinoptilolite Column Ammonia Removal Model

Journal of the Environmental Engineering Division, 1978
A simple model employing a linear driving force in the particle phase has been successfully employed to model ammonium removal from a synthetic wastewater by a column of clinoptilolite. Batch isotherm studies conducted with the ammonium containing wastewater where shown to follow the form of a Langmuir isotherm for a single solute system but these data
Michael J. Semmens, Alan C. Booth, George W. Tauxe   +2 more
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Clinoptilolites of Western Anatolia as Detergent Builders

Journal of Chemical Technology & Biotechnology, 1996
The use of clinoptilolites of Western Anatolia in detergents as phosphate substitutes was investigated. The cations present in the clinoptilolite samples were first exchanged with sodium ions. The washing characteristics of detergent mixtures containing surfactants, clinoptilolite, sodium carbonate and sodium sulphate were analysed.
Saracoglu, N, Culfaz, M, Ozdilek, O
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Sorption Capacity of Activated Clinoptilolite

Key Engineering Materials
This study investigates the impact of chemical and thermal activation on the sorption capacity of Transcarpathian clinoptilolite from the Sokyrnytsky deposit. The chemical activation of natural clinoptilolite was performed using aqueous solutions of 5% HCl and 25% H 2 SO 4
Viktoria Kochubei, Svitlana Yaholnyk, Myroslav Malovanyy, Halyna Krusir   +3 more
openaire   +1 more source