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Titolo:
SI-29 MAS NMR, XRD AND FESEM STUDIES OF RICE HUSK SILICA FOR THE SYNTHESIS OF ZEOLITES
Autore:
HAMDAN H; MUHID MNM; ENDUD S; LISTIORINI E; RAMLI Z;
Indirizzi:
UNIV TEKNOL MALAYSIA,FAC SCI,DEPT CHEM,KB 791 JOHOR BAHRU 80990 MALAYSIA
Titolo Testata:
Journal of non-crystalline solids
fascicolo: 1-2, volume: 211, anno: 1997,
pagine: 126 - 131
SICI:
0022-3093(1997)211:1-2<126:SMNXAF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR MAGNETIC-RESONANCE; SOLID-STATE; CROSS-POLARIZATION; SURFACE-STRUCTURE; RESOLUTION; GLASSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
H. Hamdan et al., "SI-29 MAS NMR, XRD AND FESEM STUDIES OF RICE HUSK SILICA FOR THE SYNTHESIS OF ZEOLITES", Journal of non-crystalline solids, 211(1-2), 1997, pp. 126-131

Abstract

We have used rice husk ash as a silica source for the synthesis of zeolites. Amorphous silica is a highly reactive silicon source, but not all silica which is amorphous to XRD is equally suitable. The local structure of amorphous silica was investigated by Si-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) and field emission scanning electron microscopy (FESEM) in order to optimize the process. The results show that amorphous silica extracted by physical combustion with controlled temperature contains only Si(OSi)(4) tetrahedral units and is the most reactive silica sourer in the synthesis of zeolite Y, compared to other silica samples prepared by chemical extraction and uncontrolled burning. The presence of crystalline cristobalite and trydimite phases and SiOH groups render the silica less active.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:51:12