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Oxidative coupling of methane in solid catalysts of mixed oxides promoted by alkali (Li, Na)

Pogka Panagiota

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Summary

Air pollution is a particularly severe problem of modern society, which has escalated considerably because of human activity, resulting in strong emissions and global warming. The main sources of air pollution are means of transport, electricity generation processes, industrial fuel combustion and in general other industrial emissions.As a result, the greenhouse effect and the production of gases such as carbon dioxide (CO 2), carbon monoxide (CO), hydrocarbons (H / Cs) and their derivatives are intensified. An example of a hydrocarbon is methane (CH4), which is of particular importance since it has the highest concentration in the atmosphere.In the present dissertation a study of the catalytic process of methane oxidation in solid alkali-promoted solid oxide catalysts (Li, Na), with the aim of producing ethylene (C2H4) and using it as a fuel and as the main compound for product composition. Specifically, the following supported catalysts were studied and used: 5% Li_6% s_Zr, 1.86% Na_6% s_CeZrTi, 1.86% Li_6% s_CeZrTi, 5% Li_6% s_CeZrTi and 5% Li_6% s_CeZr.In order to determine the catalytic behavior and the performance of the catalysts tested during the oxidative coupling reaction of methane to ethylene, two series of experiments were performed, the Stability experiments and the Light off experiments. Both stability and ignition experiments were performed on a solid bed reactor and the amount of catalyst placed in the reactor was 50 mg. During the experimental process, the reactant gases were introduced into the reactor: Ar, CH4 and O2 at a pressure of 1atm and a flow of 15 cc / min. After the end of the reaction the gaseous products were fed to a gas chromatograph, which is connected to a computer, in order to carry out a further analysis of the results.

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