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Biphasic intergrowth effects of La2MnNiO6–MgO composite oxide for methane catalytic combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
40129 45844 2013 8 PDF Available
Title
Biphasic intergrowth effects of La2MnNiO6–MgO composite oxide for methane catalytic combustion
Abstract

•Double perovskits La2MnNiO6 is a novel catalyst for methane combustion.•La2MnNiO6–MgO composite oxide was prepared by biphasic intergrowth method.•Effects of biphasic intergrowth are presented in the La2MnNiO6–MgO system.•La2MnNiO6–MgO shows superior catalytic activity and stability for methane combustion.

Biphasic intergrowth La2MnNiO6–MgO composite oxide containing 30 wt% La2MnNiO6 was synthesized by ammonia aqueous (25 vol.%) co-precipitation method calcined at 1100 °C and investigated in the catalytic combustion of methane. Compared with the corresponding pure double perovskite-type oxide La2MnNiO6, the composite oxide La2MnNiO6–MgO exhibited much higher catalytic performance (T50 = 548 °C,T90 = 628 °C) and exceptional thermal stability. The excellent performance of La2MnNiO6–MgO was explained by various characterizations, such as XRD, ICP, H2-TPR, XPS, and TEM techniques. The catalytic activity of La2MnNiO6–MgO prepared by biphasic intergrowth method is superior to La2MnNiO6/MgO obtained by impregnation technique, mechanical mixing of La2MnNiO6 and MgO, and pure La2MnNiO6. The better performance of La2MnNiO6–MgO for methane catalytic combustion reaction is ascribed to a strong intergrowth interaction between La2MnNiO6 and MgO during the synthesis process. Therefore, the La2MnNiO6–MgO composite oxide can be deemed as an attractive candidate as a catalyst for the combustion of methane.

Graphical abstractIn this work, biphasic intergrowth La2MnNiO6–MgO composite oxide was successfully synthesized by novel method of biphasic intergrowth. The effects of biphasic intergrowth La2MnNiO6 and MgO were investigated in terms of the catalytic activity for methane combustion and physic-chemical properties. Experimental results showed that the introduction of sintering barrier MgO, not only efficiently hinder the sintering of perovskites particles but also simultaneously enhance their catalytic activities. Figures TEM image of La2MnNiO6–MgO; Temperature dependence of methane combustion over catalysts (a) La2MnNiO6–MgO prepared by biphasic intergrowth method, (b) pure La2MnNiO6, (c) mechanical mixing of La2MnNiO6 and MgO, (d) MgO and (e) blank.Figure optionsDownload full-size imageDownload high-quality image (224 K)Download as PowerPoint slide

Keywords
Biphasic intergrowth; Double perovskite-type oxide; Methane catalytic combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 464–465, 15 August 2013, Pages 261–268
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