Abstract
LiCl-Na2MoO4 was found to be an active catalyst for oxidative coupling of methane at temperatures around 620 °C. In these systems, the selectivity for the formation of C3-products exceeds the selectivity for the formation of C2-products. While the homogeneous reaction of CH4 and O2 leads to C3H6 as C3-product, the 50% LiCl-50% Na2MoO4 catalyst leads to C3H8 as the predominant C3-product, indicating that in the latter case the reaction cannot be purely homogeneous. The dependency of the product distribution on temperature, gas composition, reactor dimensions, flow rate, CH4/O2 ratio and type of catalyst has been studied. The reaction was studied by co-feeding CH4, O2 and a diluent gas at atmospheric pressure continuously in a conventional flow reactor containing the catalyst. The reaction products observed were: C2H4, C2H6, C3H6, C3H8, H2O and CO + CO2. The two latter gases were the main oxidation products observed. Characterization of the catalysts used was carried out by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD).
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Kiwi, J., Ravidranathan Thampi, K., Mouaddib, N. et al. Oxidative coupling of methane. The effect of alkali chlorides on molybdate based catalyst leading to high selectivity in C3-product formation. Catal Lett 18, 15–26 (1993). https://doi.org/10.1007/BF00769494
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DOI: https://doi.org/10.1007/BF00769494