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Oxidative coupling of methane to C2 hydrocarbons on the Mg–Ti mixed oxide-supported catalysts at the lower reaction temperature: Role of surface oxygen atoms

Paper ID Volume ID Publish Year Pages File Format Full-Text
40107 45844 2013 10 PDF Available
Title
Oxidative coupling of methane to C2 hydrocarbons on the Mg–Ti mixed oxide-supported catalysts at the lower reaction temperature: Role of surface oxygen atoms
Abstract

•Oxidative coupling of methane (OCM) on the Mg–Ti mixed oxide-supported catalysts.•High catalytic activity at the lower reaction temperature for the development of energy-saving processes.•Improved catalytic activity by the active surface lattice oxygen atoms.

The oxidative coupling of methane (OCM) couples methane molecules, which are the major components of natural gas, to form ethane and ethylene in order to produce fuels and chemicals. Because of the high reaction temperature (700–900 °C) to obtain high yields of desirable products, the OCM process has been difficult to commercialize. We have developed a less energy-intensive OCM process that exhibits higher activity at a lower reaction temperature using Mg–Ti mixed oxide-supported Na/W/Mn catalysts. The catalyst consisting of Mg/(Mg + Ti) = 0.5 (mol/mol) exhibited the highest C2 hydrocarbons yields (i.e., 18.1% at 825 °C and 16.5% at 775 °C) among the mixed oxide-supported catalysts, which were higher than those of the conventional SiO2-supported catalyst particularly at a low temperature of 775 °C (12.8%). Based on catalyst characterization by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), UV–vis spectroscopy (UV–vis), O2-temperature programmed desorption (O2-TPD), and CO2-temperature programmed desorption (CO2-TPD), the improved catalytic activity of the mixed oxide-supported catalysts was attributed to more active surface lattice O atoms.

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Keywords
Oxidative coupling of methane; Mg–Ti mixed oxide; Catalyst; Surface lattice oxygen
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Oxidative coupling of methane to C2 hydrocarbons on the Mg–Ti mixed oxide-supported catalysts at the lower reaction temperature: Role of surface oxygen atoms
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 464–465, 15 August 2013, Pages 68–77
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