A series of Na₂WO₄/Mn/SiO₂ catalysts supported on mesoporous silica were prepared and tested for the oxidative coupling of methane in chemical looping experiments. The parameter variations were done for specific surface area, Mn-loading and support material. Chemical looping experiments reveal that highest catalytic activity is observed at 2 wt% Mn and 5 wt% Na₂WO₄ on mesoporous silica. Repetitive methane pulse experiments allowed us to determine the oxygen uptake of the Na₂WO₄/Mn/SiO₂ catalyst in chemical looping experiments. We found a correlation between oxygen storage capacity and manganese loading, which is in line with the reversible change of Mn(III) concentration observed in oxidation and reduction cycles of the material. Furthermore, we observed that ethylene formation is independent of the catalyst material in chemical looping conditions. No indication for the presence of W(V) was found.

制备了一系列负载在介孔二氧化硅上的Na ₂ WO ₄ / Mn / SiO ₂催化剂，并在化学环实验中测试了甲烷的氧化偶联作用。针对比表面积，Mn负载量和载体材料进行了参数变化。化学成环实验表明，在介孔二氧化硅上，以2 wt％的Mn和5 wt％的Na ₂ WO ₄观察到最高的催化活性。重复的甲烷脉冲实验使我们能够确定Na ₂ WO ₄ / Mn / SiO ₂的氧吸收化学循环实验中的催化剂。我们发现储氧量与锰含量之间存在相关性，这与在材料的氧化和还原循环中观察到的Mn（III）浓度的可逆变化一致。此外，我们观察到在化学成环条件下，乙烯的形成与催化剂材料无关。未发现存在W（V）的迹象。