The present thesis was performed and issued at the Technical Chemistry Department of the Chemistry Institute at the Technische Universität Berlin, in the framework of "Unicat" (Unifying Concepts in Catalysis) project as a part of the subproject D1/E1, "Activation of Methane". First of all, I would like to thank my supervisor Prof. Dr. Reinhard Schomäcker, for admitting me into his research group, for the supervision of my work and giving me the chance to achieve this milestone. I would also like to thank Prof. Dr. Robert Schlögl for the second supervision. I thank Prof. Dr.-Ing. Ulrich Nieken as my external examiner. I thank also Dr. Patrick Littlewood and Samira Parishan for great discussions about the development of the setup, the OCM and also experimental techniques in general. Further I like to thank all colleagues in the research group of Prof.
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