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Synthesis and surface characterization of nanometric La1−xKxMnO3+δ particles by Y Ng Lee; Z El-Fadli; F Sapiña; E Martinez-Tamayo; V Cortés Corberán is a Materials Science article available to read on EtoBox.

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The use of a precursor-based synthetic method, namely, the freeze-drying of acetic acid solutions, allows the preparation of single-phased perovskites in the series La 1Àx K x MnO 3 (x 0.15) at temperatures as low as 873 K. This soft treatment of the precursors yields products with high speci®c surface areas (20±26 m 2 g À1 ), constituted by uniform nanometric particles (30± 50 nm), with their surface enriched in K and Mn. Samples prepared at 1073 K present lower speci®c surface areas (7± 14 m 2 g À1 ), and show no K-and Mn-enrichment for x 0.15. However, in samples with x0.20 and 0.25, the presence of a secondary phase, K 2 Mn 4 O 8 , is detected by X-ray diffraction, as well as a surface enrichment in K and Mn. These perovskite materials were found to be active for the catalytic combustion of ethane at low temperatures (573±648 K). As a general trend, the substitution of lanthanum by potassium decreases the areal rate, and for the more substituted samples (x>0.10), it increases the selectivity to ethene.

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Author

Y Ng Lee; Z El-Fadli; F Sapiña; E Martinez-Tamayo; V Cortés Corberán

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

1999

Language

EN

Field

Materials Science (Physical Sciences)