Reactivity and Structure of Complex Sulfides in the Oxidative Methane Coupling with Soft Oxidants

由于天然储量中甲烷的丰富和乙烯作为原料的高价值，甲烷直接氧化偶联为乙烯具有很高的经济利益。第一个结果上使用的含硫气体作为氧化剂是有前途的，但只有少数的研究相对狭窄的范围内的材料已经进行了迄今为止，本研究的主要目的是系统地探讨不同类型的硫化物在甲烷与软氧化剂，如含硫气体的氧化偶联，以向下选择最活跃和选择性的催化剂，该反应。此外，提出进行测量，其中还原气体混合到反应物进料中。这可以防止过氧化为二硫化碳。通过将反应器测量与显微镜和光谱研究相结合，可以发现关于催化活性相的信息，并且可以鉴定有利于或不利于甲烷向乙烯的高转化率的催化剂特征。

Due to the abundance of methane in natural reserves and the high value of ethylene as raw material, the direct oxidative coupling of methane to ethylene is of high economical interest. First results on the use of sulfur gas as oxidant are promising but only few studies on a relatively narrow range of materials have been performed so far.The major aim of this study is to systematically explore different types of sulfides in the oxidative coupling of methane with soft oxidants such as sulfur gas in order to down-select the most active and selective catalysts for this reaction. Furthermore, it is proposed to perform measurements in which a reducing gas is mixed to the reactant feed. This could prevent the overoxidation to carbon disulfide. By combining the reactor measurements with microscopic and spectroscopic investigations, information on the catalytically active phase may be found and catalyst features which favor or disfavor a high conversion of methane to ethylene could be identified.