Na‐W‐Mn/SiO 2 Catalyst With MnO x Regulated NaWO x Sites for Low‐Temperature Oxidative Coupling of Methane

The oxidative coupling of methane (OCM) reaction can directly convert CH4 into C2 (ethylene, ethane), which is vital for converting the world's abundant natural gas into valuable chemicals. Na-W-Mn/SiO2 catalyst with high thermal stability and catalytic activity has been widely studied. However, the high temperature required for OCM reaction over Na-W-Mn/SiO2 catalyst has restricted its application. The development of low-temperature OCM catalysts is currently one of the hot topics in research. This study regulated the MnOx-Na2WO4 interaction by adjusting the Mn loading, inducing changes in oxygen species and achieving low-temperature oxidative coupling on traditional Na-W-Mn/SiO2 catalyst. At 750°C, the Na-W-5Mn/SiO2 catalyst achieved a CH4 conversion of 44.4%, C2 selectivity of 45.9%, and a C2 yield of 20.4%.