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Catalytic performance in methane combustion of rare-earth perovskites RECo0.50Mn0.50O3 (RE: La, Er, Y)

Paper ID Volume ID Publish Year Pages File Format Full-Text
55693 47062 2011 7 PDF Available
Title
Catalytic performance in methane combustion of rare-earth perovskites RECo0.50Mn0.50O3 (RE: La, Er, Y)
Abstract

RECo0.50Mn0.50O3 perovskites (RE: La, Y, Er) have been prepared by an auto-combustion method and calcined at 700 °C, 850 °C and 950 °C. YCo0.50Mn0.50O3 forms at temperatures as low as 700 °C, much lower than those required in solid-state ceramic synthesis. All materials show adequate specific surface when calcined at 700 °C. ErCo0.50Mn0.50O3, which has the largest surface area, shows the lowest activity due to the presence of segregated phases, while YCo0.50Mn0.50O3, which reaches the perovskite structure at lower temperatures, exhibits the highest catalytic activity. The catalytic activity, evaluated from the total combustion of methane, can be related to the presence of the perovskite structure, an adequate surface area and the reducibility of the material. At the calcination temperatures of 850 °C and 950 °C, at which the surface area and crystalline degrees are almost the same for the La-, Y- and Er-systems, no differences in the catalytic activity were detected. The catalytic activity, higher for materials calcined at lower temperatures, is progressively lost due to sintering processes occurring at higher calcinations temperatures, as confirmed by SEM observations.

Graphical abstractThe catalytic activity can be related to the presence of the perovskite structure, adequate surface area and the reducibility of the material. It is progressively lost due to a sintering process, which occurs when the material is calcined at higher temperature.Figure optionsDownload full-size imageDownload high-quality image (162 K)Download as PowerPoint slideHighlights► The ErCo0.50Mn0.50O3 calcined at 700 °C exhibits the lowest catalytic activity. ► Segregated phases are detected for ErCo0.50Mn0.50O3. ► YCo0.50Mn0.50O3 perovskite calcined at 700 °C exhibits the higher catalytic activity. ► For catalysts calcined at 850 °C and 950 °C there are no differences in the catalytic activity.

Keywords
Perovskites; Methane; Combustion; Erbium; Yttrium; Lanthanum
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Catalytic performance in methane combustion of rare-earth perovskites RECo0.50Mn0.50O3 (RE: La, Er, Y)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 172, Issue 1, 25 August 2011, Pages 111–117
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us