Modified iron perovskites as catalysts precursors for the conversion of syngas to low molecular weight alkenes

Autor:	M.L. Cubeiro, P.R. Sojo, Delfín Moronta, Y.Ng Lee, M.J. Pérez-Zurita, Mireya R. Goldwasser, F. Gonzalez-Jimenez, E. Pietri, V.E. Dorantes
Rok vydání:	2003
Předmět:	Process Chemistry and Technology Inorganic chemistry Iron oxide chemistry.chemical_element Manganese Heterogeneous catalysis Catalysis Carbide chemistry.chemical_compound chemistry Mössbauer spectroscopy Physical and Theoretical Chemistry Perovskite (structure) BET theory
Zdroj:	Journal of Molecular Catalysis A: Chemical. 193:227-236
ISSN:	1381-1169
DOI:	10.1016/s1381-1169(02)00472-7
Popis:	Five perovskite oxides with the composition La 1− x K x Mn y Fe 1− y O 3 (0≤ x , y ≤0.2) were synthesized by the co-precipitation method. Techniques such as chemical and XR fluorescence analysis, powder X-ray diffraction (XRD), BET surface area, IR, EPR and Mossbauer spectroscopy were applied to characterize the structural features of the perovskites. The activity of the solids was strongly dependent on the presence of iron carbides. It was observed that K promotes the reducibility of the solid to α-Fe giving rise to more carbide phases. Mn produces a significant increase in alkenes production. The combined presence of both K and Mn (La 0.9 K 0.1 Fe 0.9 Mn 0.1 O 2.9 ) strongly modified the selectivity of the oxides, giving rise to a stable catalyst with high yield of C 2 C 4 alkenes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4fd0a53ce316ad0da5941b5d0626733b https://doi.org/10.1016/s1381-1169(02)00472-7 Zobrazit plný text záznamu Full Text from ScienceDirect