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Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41851 45902 2010 5 PDF Available
Title
Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts
Abstract

Properties of Ag–La2O3/SiO2 catalysts in oxidative coupling of methane (OCM) carried out in redox cyclic mode were studied. Methane and air were injected as separate and alternating pulses, and the oxidative conversion of methane proceeded due to participation of mobile lattice oxygen of the catalysts. It was found that joint action of Ag and La2O3 in OCM could give considerable synergetic effect. Such catalysts as 3%Ag–10%La2O3/SiO2 and 6%Ag–10%La2O3/SiO2 exhibited high efficiency in the OCM reaction performed in the redox cyclic mode. In the case of 3%Ag–10%La2O3/SiO2, the yield of C2 hydrocarbons reached about 30% at C2 selectivity close to 60%. Active sites which were responsible for OCM reaction were generated during reduction of silver by the injected methane. OCM selectivity increased remarkably if a small amount of hydrogen was injected over the catalyst before the methane pulse.

Graphical abstractProperties of Ag–La2O3/SiO2 catalysts in oxidative coupling of methane (OCM) carried out in redox cyclic mode were studied. Methane and air were injected as separate and alternating pulses, and the oxidative conversion of methane proceeded due to participation of mobile lattice oxygen of the catalysts. The figure shows a pulse feed circuit applied to the redox cyclic mode of OCM.Figure optionsDownload full-size imageDownload high-quality image (33 K)Download as PowerPoint slide

Keywords
Oxidative coupling of methane; Redox cyclic mode; Lattice oxygen; Ag–La2O3/SiO2 catalyst; Synergetic effect
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Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 380, Issues 1–2, 31 May 2010, Pages 28–32
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