Abstract
Abstract Two completely different behaviors of the oxidative transformation of methane were performed over the nickel-based catalysts because of the different modifications by alkali metal oxide and rare earth metal oxide and the different interactions between nickel and supports, and two types of catalysts, namely the LiNiLaOx catalyst with a good Oxidative Coupling of Methane (OCM) performance and the LiNiLaOx/Al 2 O 3 supported catalyst with an excellent performance of the Partial Oxidation of Methane to Syngas (POM) reaction were obtained. Several techniques, such as flow-reaction, pulse-reaction, XRD, H 2 -TPR, XPS, TPO, and TG, etc., were employed to investigate the relation among the preparation and composition of catalysts, the structures of catalysts and the catalytic performances, especially effects of each component, the active phases and their precursors, the redox behaviors and the states of nickel present in those nickel-based catalysts. The effects of acid-base properties on the states of nickel present and on the directions of the oxidative transformation of methane, the interaction between nickel and other components and the deposition of surface carbon over catalysts were studied. The types of active centers, the modes of the activation of methane and the reaction mechanisms were discussed in detail.
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