Carbon molecular sieves from carbon cloth: Influence of the chemical impregnant on gas separation properties

Carbon materials with molecular sieve properties (CMS) were prepared by pyrolysis of cotton fabrics by chemical activation procedures. To evaluate the changes in the chemical and textural properties, the impregnants AlCl 3, ZnCl 2 and H 3PO 4 were used at 1123 K. The materials were characterized usi...

Full description

Saved in:
Bibliographic Details
Published inApplied surface science Vol. 256; no. 17; pp. 5221 - 5225
Main Authors Rodríguez-Blanco, G., Giraldo, L., Moreno-Piraján, J.C.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 15.06.2010
Elsevier
Subjects
Activated carbon cloth
Activation
Adsorption
Calorimetry
Carbon
Carbon dioxide
Chemical activation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Gas separation
Immersion
Immersion calorimetry
Microporous material
Molecular sieve
Molecular sieves
Physics
Separation
Surface chemistry
Immersion calorimetry
Microporous material
Gas separation
Chemical activation
Activated carbon cloth
Molecular sieve
Activated carbon
Molecular sieves
Carbon
Online AccessGet full text
ISSN0169-4332
1873-5584
DOI10.1016/j.apsusc.2009.12.107

Cover

More Information
Summary:Carbon materials with molecular sieve properties (CMS) were prepared by pyrolysis of cotton fabrics by chemical activation procedures. To evaluate the changes in the chemical and textural properties, the impregnants AlCl 3, ZnCl 2 and H 3PO 4 were used at 1123 K. The materials were characterized using adsorption of nitrogen and carbon dioxide, TPD, and immersion calorimetry in C 6H 6. Adsorption kinetics of O 2, N 2, CO 2, CH 4, C 3H 8 and C 3H 6 were measured in all the prepared materials to determine their behaviour as molecular sieves. The results confirm that the chemical used as impregnant has a significant effect on the resulting CMS separation properties. All materials exhibit microporosity and low oxygen surface group contents; however, the sample impregnated with zinc chloride, with an immersion enthalpy value of 66.4 J g −1 in benzene, exhibits the best performance in the separation of CH 4–CO 2 and C 3H 8–C 3H 6 at 273 K.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2009.12.107