Documents disponibles écrits par cet auteur

Mg-Zn and Mn-Zn ferrites derived from coil core materials as new precursors for catalysts of primary alcohols transformations / Roman Klimkiewicz in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6291–6295 Titre : Mg-Zn and Mn-Zn ferrites derived from coil core materials as new precursors for catalysts of primary alcohols transformations Type de document : texte imprimé Auteurs : Roman Klimkiewicz, Auteur ; Kazimierz Przybylski, Auteur ; Jan Baran, Auteur Année de publication : 2009 Article en page(s) : pp. 6291–6295 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Mg-Zn  Mn-Zn  Microelectronic  ferrite  materials  Alcohols  transformation  Catalysts Résumé : Two new precursor materials, (Mg0.63Zn0.37)(Mn0.1Fe1.8)O3.85 (hereafter Mg−Zn) and (Mn0.55Zn0.35Fe0.1)Fe2O4 (hereafter Mn−Zn), derived from the microelectronic ferrite materials studied earlier by us, were found to be catalytically active in primary alcohols transformation. Both Mg−Zn and Mn−Zn ferrites reveal dehydrogenating features, transforming a primary alcohol into an aldehyde, but they differ with respect to subsequent bimolecular condensation to symmetric ketone. The difference in selectivity can be tentatively explained by the different dispersion of surface both Lewis acidic centers and reducing centers as well as the presence of a strong synergic effect between these centers. The materials were tested by XRD, TPR, IR, and BET methods. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801979w [article] Mg-Zn and Mn-Zn ferrites derived from coil core materials as new precursors for catalysts of primary alcohols transformations [texte imprimé] / Roman Klimkiewicz, Auteur ; Kazimierz Przybylski, Auteur ; Jan Baran, Auteur . - 2009 . - pp. 6291–6295. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6291–6295 Mots-clés : Mg-Zn  Mn-Zn  Microelectronic  ferrite  materials  Alcohols  transformation  Catalysts Résumé : Two new precursor materials, (Mg0.63Zn0.37)(Mn0.1Fe1.8)O3.85 (hereafter Mg−Zn) and (Mn0.55Zn0.35Fe0.1)Fe2O4 (hereafter Mn−Zn), derived from the microelectronic ferrite materials studied earlier by us, were found to be catalytically active in primary alcohols transformation. Both Mg−Zn and Mn−Zn ferrites reveal dehydrogenating features, transforming a primary alcohol into an aldehyde, but they differ with respect to subsequent bimolecular condensation to symmetric ketone. The difference in selectivity can be tentatively explained by the different dispersion of surface both Lewis acidic centers and reducing centers as well as the presence of a strong synergic effect between these centers. The materials were tested by XRD, TPR, IR, and BET methods. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801979w