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

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
Authors
전원진이종열이마로최재욱하정명서동진김일원
Keywords
Oxidative coupling of methane; Mg-Ti mixed oxide; Catalyst; Surface lattice oxygen
Issue Date
2013-08
Publisher
Applied catalysis A, General
Citation
VOL 464-465, 68-77
Abstract
tThe oxidative coupling of methane (OCM) couples methane molecules, which are the major componentsof natural gas, to form ethane and ethylene in order to produce fuels and chemicals. Because of the highreaction temperature (700–900◦C) to obtain high yields of desirable products, the OCM process has beendifficult to commercialize. We have developed a less energy-intensive OCM process that exhibits higheractivity at a lower reaction temperature using Mg–Ti mixed oxide-supported Na/W/Mn catalysts. Thecatalyst consisting of Mg/(Mg + Ti) = 0.5 (mol/mol) exhibited the highest C2hydrocarbons yields (i.e., 18.1%at 825◦C and 16.5% at 775◦C) among the mixed oxide-supported catalysts, which were higher than thoseof the conventional SiO2-supported catalyst particularly at a low temperature of 775◦C (12.8%). Based oncatalyst 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 ofthe mixed oxide-supported catalysts was attributed to more active surface lattice O atoms.
URI
http://pubs.kist.re.kr/handle/201004/45083
ISSN
0926860X
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE