SiO(2)@MnO(x)@Na(2)WO(4)@SiO(2) core–shell-derived catalyst for oxidative coupling of methane

SiO(2)@MnO(x)@Na(2)WO(4)@SiO(2) core–shell catalysts were prepared and their fabrication was confirmed using transmission electron microscopy. The formation of Mn-based nanosheets on the silica spheres is important for the deposition of nanoscopic Na(2)WO(4). The SiO(2)@MnO(x)@Na(2)WO(4)@SiO(2) core–shell catalysts were used for the oxidative coupling of methane at a temperature of 700–800 °C at which the nanostructures were completely destroyed. Although the core–shell structures did not survive the high-temperature oxidative coupling of methane, the selective production of olefins and paraffins can be attributed to highly dispersed Na(2)WO(4) derived from confined core–shell structures.