Abstract
A series of Ce-promoted Mn-Na 2WO 4/SiO 2 catalysts were prepared by incipient wetness impregnation method, and their catalytic performance for oxidative coupling of methane (OCM) was investigated at atmospheric pressure in a micro-quartz-tube reactor. The catalysts were characterized by X-ray diffraction (XRD), temperature program reduction (TPR) and BET surface area. Ce promoter increased surface area and Na 2WO 4 species dispersion, which enriched the amount of the surface species. In addition, Ce promoter increased the Na/W species reduction, but the reduction peak shifted to higher temperature. Stability test of 5wt%Ce catalyst indicated suitable performance and stability. The selectivity and yield of C 2+ hydrocarbons after 50 h operation reached 65.5% and 19.6%, respectively, at 840 °C over 5wt%Ce-2wt%Mn-5wt%Na 2WO 4/SiO 2 catalyst.
Published Version
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