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La-promoted Na2WO4/Mn/SiO2 catalysts for the oxidative conversion of methane simultaneously to ethylene and carbon monoxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
43616 45979 2007 9 PDF Available
Title
La-promoted Na2WO4/Mn/SiO2 catalysts for the oxidative conversion of methane simultaneously to ethylene and carbon monoxide
Abstract

A series of La-promoted 5 wt% Na2WO4/2 wt% Mn/SiO2 catalysts were prepared by varying the impregnation sequence and the concentration of La promoter, and their catalytic performance for the oxidative conversion of methane was investigated in a micro-quartz-tube reactor. The catalysts were characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). It was found that the existence of Mn ions was in favor of the dispersion of La species on the catalyst, and the addition of La promoter could increase the dispersion of Na2WO4, which enriched the amount of surface oxygen species connected with the metal atoms. This oxygen species was found to be active for the oxidative coupling of methane to C2 hydrocarbons. The selectivity and yield of C2 hydrocarbons with a C2H4/CO ratio of 1/1 reached the optimized value of about 56% and 25%, respectively, at 800 °C, over the 5 wt% Na2WO4/2 wt% La–2 wt% Mn/SiO2 catalyst prepared by co-impregnation of La and Mn.

Graphical abstractThe oxygen species connected to metals over La-promoted 5 wt% Na2WO4/2 wt% Mn/SiO2 catalysts were found to be the active oxygen species for the oxidative coupling of methane to C2 hydrocarbons. The selectivity and yield of C2 hydrocarbons with a C2H4/CO ratio of 1/1 reached about 56% and 25%, respectively, under optimized conditions. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Oxidative coupling of methane; La-promoted Na2WO4/Mn/SiO2 catalyst; Surface oxygen species
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La-promoted Na2WO4/Mn/SiO2 catalysts for the oxidative conversion of methane simultaneously to ethylene and carbon monoxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 323, 30 April 2007, Pages 126–134
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
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