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
- 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
- 전원진; 이종열; 이마로; 최재욱; 하정명; 서동진; 김일원
- Oxidative coupling of methane; Mg-Ti mixed oxide; Catalyst; Surface lattice oxygen
- Issue Date
- Applied catalysis A, General
- VOL 464-465, 68-77
- 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.
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