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Titolo:
Synergy between alpha-Sb2O4 and Fe-2(MaO(4))(3) during the first hours of the catalytic oxidation of isobutene to methacrolein
Autore:
Xiong, YL; Weng, LT; Bertrand, P; Ladriere, J; Daza, L; Ruiz, P; Delmon, B;
Indirizzi:
Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium Univ Catholique Louvain Louvain Belgium B-1348 , B-1348 Louvain, Belgium Univ Catholique Louvain, Unite Physicochim & Phys Mat, B-1348 Louvain, Belgium Univ Catholique Louvain Louvain Belgium B-1348 , B-1348 Louvain, Belgium Univ Catholique Louvain, Unite Chim Inorgan & Nucl, B-1348 Louvain, Belgium Univ Catholique Louvain Louvain Belgium B-1348 , B-1348 Louvain, Belgium
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 155, anno: 2000,
pagine: 59 - 71
SICI:
1381-1169(20000420)155:1-2<59:SBAAFD>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ETHYL FORMAMIDE DEHYDRATION; SELECTIVE OXIDATION; PHASE COOPERATION; ANTIMONY OXIDES; MECHANICAL MIXTURES; SB2O4; MOO3; DEHYDROGENATION; OXYGEN; SPECTROSCOPY;
Keywords:
catalytic synergy; oxide catalysts; isobutene oxidation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Delmon, B Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, Pl Croix Sud 2-17, B-1348 Louvain, Belgium Univ Catholique Louvain Pl Croix Sud2-17 Louvain Belgium B-1348
Citazione:
Y.L. Xiong et al., "Synergy between alpha-Sb2O4 and Fe-2(MaO(4))(3) during the first hours of the catalytic oxidation of isobutene to methacrolein", J MOL CAT A, 155(1-2), 2000, pp. 59-71

Abstract

The physico-chemical properties and the catalytic behaviour of mixtures ofiron molybdate and antimony oxide in the selective oxidation of isobutene to methacrolein were studied with special consideration of the possibility of changes of these oxides during the catalytic reaction. The catalysts were separately prepared Fe-2(MoO4)(3) and alpha-Sb2O4 and mixtures thereof. They were characterized by BET surface area measurements, X-ray diffraction (XRD), Conventional Transmission Electron Microscopy (CTEM), Electron ProbeMicro Analysis (EPMA), X-ray Photoelectron Spectroscopy (XPS), Ion Scattering Spectroscopy (ISS) and Mossbauer spectroscopy before and after the catalytic reaction. Under the reaction conditions used, no mutual contaminationwas detectable neither before nor after test. Pure alpha-Sb2O4 is inactive. Fe-2(MoO4)(3) is active but poorly selective. The alpha-Sb2O4-Fe,(MoO4)(3) mixtures exhibit a synergetic effect, corresponding to an increase both in the methacrolein yield and in the selectivity to methacrolein. The donor properties of alpha-Sb2O4 and the acceptor properties of the Fe-2(MoO4)(3) oxide can explain this synergism in the frame of the Remote Control theory:oxygen spillover would be emitted by alpha-Sb2O4, and migrate to Fe-2(MoO4)(3) creating or regenerating selective sites on this last phase. The beneficial effect of spillover oxygen seems to reside in its ability to keep iron in a higher oxidation state, close to Fe+3. (C) 2000 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 04/07/20 alle ore 18:31:16