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Titolo:
Pillaring of different smectite members by chromium species (Cr-PILCs)
Autore:
Volzone, C;
Indirizzi:
UNLP, CIC, CONICET, CETMIC,Ctr Tecnol Recursos Minerales & Ceram, RA-1897 Gonnet, Buenos Aires, Argentina UNLP Gonnet Buenos Aires Argentina RA-1897onnet, Buenos Aires, Argentina
Titolo Testata:
MICROPOROUS AND MESOPOROUS MATERIALS
fascicolo: 1-3, volume: 49, anno: 2001,
pagine: 197 - 202
SICI:
1387-1811(20011115)49:1-3<197:PODSMB>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC-REACTIONS; SHEET SILICATES; MONTMORILLONITE; CATALYSTS; HYDRATION; ALKENES; IONS;
Keywords:
Cr-pillared smectites; smectites; texture; structure; acidity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Volzone, C UNLP, CIC, CONICET, CETMIC,Ctr Tecnol Recursos Minerales & Ceram, Cno Centenario & 506,CC 49, RA-1897 Gonnet, Buenos Aires, Argentina UNLPCno Centenario & 506,CC 49 Gonnet Buenos Aires Argentina RA-1897
Citazione:
C. Volzone, "Pillaring of different smectite members by chromium species (Cr-PILCs)", MICROP M M, 49(1-3), 2001, pp. 197-202

Abstract

Cr-pillared smectites by intercalation of OH-Cr species in montmorillonite, beidellite, nontronite and saponite smectite clays followed by heating at450 degreesC in air or nitrogen atmosphere were prepared. The pillaring reagent containing OH-Cr species was obtained from chromium nitrate solutionsby adding NaOH with OH/Cr = 2 and hydrolyzed at 60 degreesC for one day. The samples were characterized by X-ray diffraction, by N-2 adsorption-desorption isotherms, by acidity measurement and by chemical analysis. The Cr pillared smectites prepared at 450 IC in nitrogen atmosphere showed interlayer spacing in the range of 13.8-18.8 Angstrom. These values were a function of the type of smectite members. The micropore surface area, the micropore volume and the d(001) spacing after pillaring of different smectite membersincreased with the amount of chromium retentions. Cr-PILCs (pillared interlayered clays, PILC) showed Lewis (L) and Bronsted (B) acidity characteristics and the L/(L + B) ratio was higher in Cr-PILCs prepared from smectites with higher tetrahedral negative charge of the structure. The charges and the composition of the smectite structures influenced considerably the properties of the Cr-PILCs. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/11/17 alle ore 03:47:13