Results 171 to 180 of about 8,256 (210)

Clinoptilolite-Heulandite Nomenclature

Reviews in Mineralogy and Geochemistry, 2001
Heulandite was first named in 1822 for the English mineral collector, J. H. Heuland (see Dana 1914, p. 574–576). Although it is typically found as macroscopic (commonly 0.2–2 cm in size) crystals in cavities in mafic igneous rocks and is volumetrically minor on the Earth’s surface, heulandite also occurs in larger amounts in some sedimentary deposits ...
D. L. Bish, J. M. Boak
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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 ...
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Industrial Sludge Solidification by Using Clinoptilolite

Journal of Environmental Science and Health, Part A, 2004
The sludge from metal plating industry is generally considered as "hazardous waste" due to its toxic heavy metal content. Solidification/stabilization techniques which are applied as prior to landfill give good results for the disposal of especially inorganic sludges into the landfill in a safe manner.
Mustafa, Balkan, Günay, Kocasoy
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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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Porous structure of natural and modified clinoptilolites

Journal of Colloid and Interface Science, 2006
The evaluation of the pore-size distribution (PSD) of natural and modified mesoporous zeolites, i.e., clinoptilolites is presented. We demonstrate the SEM results showing that the pores of fracture-type from 25-50 nm to 100 nm in size between clinoptilolite grains, as well as pores between crystal aggregates up to 500 nm in size are present in the ...
Kowalczyk, Poitr, Sprynskyy, M., Terzyk, A., Lebedynet, M., Namiesnik, J., Buszewski, B.   +5 more
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Exchange and reduction of Cu2+ ions in clinoptilolite

Journal of Colloid and Interface Science, 2007
The ion-exchange and reduction processes for Cu(2+) ions in clinoptilolite from the Caimanes deposit (Moa, Cuba) were studied at different temperatures. The ion-exchange studies were done to determine the kinetic parameters of Cu(2+) removal from solution by this clinoptilolite modified previously to NH(+)(4) form, and thermodynamic parameters of Cu(2+)
I Rodríguez, Iznaga, V, Petranovskii, G Rodríguez, Fuentes, C, Mendoza, A Benítez, Aguilar   +4 more
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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
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Dielectric response in natural clinoptilolite

Conference Record of the 1996 IEEE International Symposium on Electrical Insulation, 2002
Several samples of cation forms of the natural clinoptilolite from Tasajeras deposit were studied using dielectric spectrometry. The behaviour of the response was analyzed for different water contents and, for the calcium and sodium forms, it was investigated for several temperatures too.
A. Delgado, A.R. Ruiz Salvador, G. Rodriguez Fuentes, A. Berazain Iturralde   +3 more
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Adsorption on Romanian natural clinoptilolite

Zeolites, 1983
Abstract Adsorption of carbon dioxide, sulphur dioxide, ammonia, and nitric oxide from air, and of hydrogen sulphide from methane, on Romanian natural zeolite in natural and modified form, is reported. The adsorption capacities, at 20°C, in flow conditions for several partial pressures of pollutants and for different linear velocity of the gaseous ...
D. Axente, M. Abrudean, A. Bâldea
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Clinoptilolite in the drug refractory chronic diarrhoea.

La Clinica terapeutica
The aim of study was to assess the safety and tolerability of a specific zeolite powder (Xeoderm powder, Phytoitalia S.r.l -Corbetta, Italy) and its effectiveness on health-related quality of life, bowel habits, psychological status (i.e., anxiety, depression, and stress).100 patients affected by inadequately treated chronic or recurrent diarrhoea were
B, Palmieri, M, Vadalà
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