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Effect of sulfur on the oxidative coupling of methane over a lanthana catalyst

✍ Scribed by Ian Campbell; Sureyya Saricilar; Ian C. Hoare; Suresh K. Bhargava

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 974 KB
Volume: 82
Category: Article
ISSN: 0926-860X
DOI: 10.1016/0926-860x(92)80002-t

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✦ Synopsis

Addition of trace amounts of H&l to the reactants for metbane oxidative coupling results in the formation of SO, and poisoning of a lanthanum oxide catalyst. Poisoning has little effect on Cx+ selectivity until conversion falls to a low level. The factors controlling catalyst poisoning were found to be sulfur concentration, gas flow-rate and catalyst temperature. Poisoned catalyst was characterised by PI-IRS, XRD, 1sOz exchange capacity and TGA, and was found to involve formation of inactive LaxO,SO, which has a decomposition temperature of ca. 900°C under reaction conditions. An equilibrium is set up between formation and decomposition of the LazOzSOI, and the extent of poisoning depends on partial pressure of SO,.

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