Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
XANES study of Li-MgO and Li-La2O3-MgO catalysts for oxidative coupling ofmethane
Autore:
Aritani, H; Yamada, H; Yamamoto, T; Tanaka, T; Imamura, S;
Indirizzi:
Kyoto Inst Technol, Fac Engn & Design, Kyoto 6068585, Japan Kyoto Inst Technol Kyoto Japan 6068585 gn & Design, Kyoto 6068585, Japan Kyoto Univ, Grad Sch Engn, Div Mol Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 Engn, Div Mol Engn, Kyoto 6068501, Japan
Titolo Testata:
JOURNAL OF SYNCHROTRON RADIATION
, volume: 8, anno: 2001,
parte:, 2
pagine: 593 - 595
SICI:
0909-0495(200103)8:<593:XSOLAL>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOPED MAGNESIUM-OXIDE;
Keywords:
La L-XANES; MgK-XANES; Li-La2O3-MgO; defect species;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Aritani, H Kyoto Inst Technol, Fac Engn & Design, Kyoto 6068585, Japan Kyoto Inst Technol Kyoto Japan 6068585 , Kyoto 6068585, Japan
Citazione:
H. Aritani et al., "XANES study of Li-MgO and Li-La2O3-MgO catalysts for oxidative coupling ofmethane", J SYNCHROTR, 8, 2001, pp. 593-595

Abstract

To characterize the defect sites in the near-surface and bulk phase of Li-MgO and Li-La2O3-MgO, XANES at Mg K-edge and La L-3-edge was applied. For Li-MgO, it can be suggested that Li doping at a low content (2.5 wt%) bringsabout the formation of defect species only in the near-surface. This is due to the localization of doped Li ions in the surface, and thus the catalytically active species containing [Li+-O-] type center exist in the surface region. After OCM reaction, the defect species are formed in the near-surface over MgO and Li-MgO. By addition of La2O3 to Li-MgO (La/(Mg+La)=0.25), the structural change during the reaction is almost suppressed in the surface. In addition, the Li-La2O3-MgO shows higher C-2 selectivity than Li-MgO.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:59:03