Abstract
Addition of phosphate to alkali-metal (AM) doped terbium oxide (TbOx) supported on MgO was shown to improve both activity (methane conversion) and selectivity to C2+ products (ethane, ethylene and higher hydrocarbons) in the oxidative coupling of methane at reaction temperatures above 600 °C. The largest improvement upon phosphate addition was observed over the K-doped TbOx/MgO catalyst, and the K(PO4)y-TbOx/MgO catalyst is not very sensitive to K content (between K:Tb ratios of 1.2 and 2.0). Above 700 °C, the highest activity and C2+ selectivity were observed over the Li(PO4)y-TbOx/MgO catalysts. It was shown that TbOx is a necessary component and Tb2O3 is essential for a high activity and selectivity over these catalysts. Moreover, the C2H4 yield is significantly improved over the Li(PO4)y-TbOx/MgO catalysts, and the stability with time-on-stream higher, compared with the Li-TbOx/MgO catalyst, as long as the lithium and phosphate concentrations are not too high.
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