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Titolo:
The role and stability of Li2O2 phase in supported LiCl catalyst in oxidative dehydrogenation of n-butane
Autore:
Landau, MV; Gutman, A; Herskowitz, M; Shuker, R; Bitton, Y; Mogilyansky, D;
Indirizzi:
Ben Gurion Univ Negev, Dept Chem Engn, Blechner Ctr Ind Catalysis & Proc Dev, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel Ben Gurion Univ Negev, Inst Appl Res, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 176, anno: 2001,
pagine: 127 - 139
SICI:
1381-1169(20011120)176:1-2<127:TRASOL>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHORT-CONTACT TIMES; SELECTIVE OXIDATION; OXIDE CATALYSTS; LIGHT OLEFINS; ETHANE; MONOLITHS; METHANE; DIMERIZATION; MAGNESIUM; PROPANE;
Keywords:
oxidative dehydrogenation; n-butane; lithium peroxide; SiO2; MgO-supported catalyst; XRD; XPS; Raman scattering spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Landau, MV Ben Gurion Univ Negev, Dept Chem Engn, Blechner Ctr Ind Catalysis & Proc Dev, POB 653, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev POB 653 Beer Sheva Israel IL-84105 srael
Citazione:
M.V. Landau et al., "The role and stability of Li2O2 phase in supported LiCl catalyst in oxidative dehydrogenation of n-butane", J MOL CAT A, 176(1-2), 2001, pp. 127-139

Abstract

This study was aimed at defining the role of active phases in supported LiCl and LiCl-DyCl3 catalysts in the catalytic oxidative dehydrogenation (ODH) of n-butane. LiCl supported on silica displayed the highest activity and selectivity in n-butane ODH compared with other alkali metal halides. Addition of DYCl3 increased the activity. TPO, XRD and Raman light scattering (RLS) data showed that LiCl and DyCl3 formed during the preparation stage were converted to Li2O2 and DyOCl phases, respectively, by calcination in air at > 400 degreesC. The results of separate TPR experiments (O-2-oxidation-butane reduction) along with XRD, RLS and X-ray photoelectron spectroscopy (XPS) data proved that butane reacts mainly with oxygen species of Li2O2 phase at ODH conditions, probably attributed to [Li+O-] pairs. The proposed functions of chlorine and dynamic oxygen in the ODH of butane are consistent with the activity, selectivity and stability of silica and magnesia-supported catalysts. High thermal stability of Li2O2 in oxidized LiCl catalyst wasattributed to the formation of protective Li2O-LiCl surface layer. Deactivation of LiCl/SiO2 catalyst in n-butane,ODH is caused by the formation of Li-silicates at reaction conditions while LiCl/MgO display a stable performance. (C) 2001 Elsevier Science B.V.. All rights reserved.

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Documento generato il 06/07/20 alle ore 09:01:04