Abstract
BiOCl is very efficient as a catalyst for the oxidative coupling of CH4 to yield C2 products, conversions of more than 20 percent and ratios of C2H4/C2H6 from 30 to 60, depending upon the precise conditions, being obtained at ca 700 °C. Its longevity, however, is rather poor: under operating conditions the solid lacks structural stability. Although LaOCl and SmOCl, each of which is isostructural with BiOCl, are inferior catalysts so far as C2H4/C2H6 ratios are concerned (0.3 to 0.6), they have superior stability. The same is true of the solid-solutions (Bi0.5,La0.5) OCl, the structural parameters of which were determined by X-ray powder Rietveld analysis. Both (Bi0.5, Sm0.5) OCl and (Bi0.5, La0.5) OCl yield C2H4/C2H6 ratios of close to unity at 700 °C.
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Williams, J., Jones, R.H., Thomas, J.M. et al. A comparison of the catalytic performance of the layered oxychlorides of bismuth, lanthanum and samarium in the conversion of methane to ethylene. Catal Lett 3, 247–255 (1989). https://doi.org/10.1007/BF00766400
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DOI: https://doi.org/10.1007/BF00766400