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Titolo:
Adsorption kinetics of CO2, O-2, N-2, and CH4 in cation-exchanged clinoptilolite
Autore:
Aguilar-Armenta, G; Hernandez-Ramirez, G; Flores-Loyola, E; Ugarte-Castaneda, A; Silva-Gonzalez, R; Tabares-Munoz, C; Jimenez-Lopez, A; Rodriguez-Castellon, E;
Indirizzi:
Benemerita Univ Autonoma Puebla, Ctr Invest, Fac Ciencias Quim, Puebla 72570, Mexico Benemerita Univ Autonoma Puebla Puebla Mexico 72570 Puebla 72570, Mexico Benemerita Univ Autonoma Puebla, Inst Fis Luis Rivera Terrazas, Puebla 72570, Mexico Benemerita Univ Autonoma Puebla Puebla Mexico 72570 Puebla 72570, Mexico Univ Malaga, Fac Ciencias, Dept Quim Inorgan, E-29071 Malaga, Spain Univ Malaga Malaga Spain E-29071 ept Quim Inorgan, E-29071 Malaga, Spain
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 7, volume: 105, anno: 2001,
pagine: 1313 - 1319
SICI:
1520-6106(20010222)105:7<1313:AKOCON>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZEOLITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Aguilar-Armenta, G Benemerita Univ Autonoma Puebla, Ctr Invest, Fac Ciencias Quim, Bvd 14 Sur& Av San Claudio,CU,Col San Manuel, Puebla 72570, MexicoBenemerita Univ Autonoma Puebla Bvd 14 Sur & Av San Claudio,CU,Col San Manuel Puebla Mexico 72570
Citazione:
G. Aguilar-Armenta et al., "Adsorption kinetics of CO2, O-2, N-2, and CH4 in cation-exchanged clinoptilolite", J PHYS CH B, 105(7), 2001, pp. 1313-1319

Abstract

The rate of adsorption of pure CO2, O-2, N-2, and CH4 on natural untreatedclinoptilolite-rich volcanic tuff (Cp) from Tehuacan (Puebla, Mexico), andon cation-exchanged clinoptilolite samples (Ca-Cp, K-Cp, and Na-Cp) has been measured at 20 degreesC using a glass high-vacuum volumetric apparatus. The X-ray diffraction pattern of Cp showed that the main crystalline phasescorrespond to clinoptilolite-heulandite and minor amounts of mordenite, cristobalite, feldspar (albite), quartz, smectite, and opal. The adsorption rates of gases in the initial period (t < 180 s) were measured with a customacquisition data card capable of registering pressure and time data five times per second, simultaneously. The influence of cation exchange on adsorption kinetics of the gases depended on the gas-adsorbent contact time (t). In the initial period, the adsorption rate of all gases on all samples decreased in the order Ca-Cp > K-Cp > Cp > Na-Cp, and the affinity decreased inthe order CO2 much greater than N-2 > O-2 > CH4, whereas at equilibrium (t--> infinity s) the adsorption uptake decreased in the sequence CO2 much greater than CH4 > N-2 > O-2. The slow adsorption of methane in Na-Cp was probably due to diffusional difficulties as a result of channel blockage by Na+ cations. By cation exchange of Cp an adsorbent can be tailored for the separation of N-2/O-2, N-2/CH4, and CO2/CH4 mixtures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 21:13:52