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Oxidative coupling of methane to ethylene with 85 yield in a gasrecycle electrocatalytic or catalytic reactor-separator

Gentekakis Ioannis, Vayenas, Constantinos G, Jiang Yi, Makri M.

Πλήρης Εγγραφή


URI: http://purl.tuc.gr/dl/dias/C9815D25-80C8-435D-A017-A90D7864616E
Έτος 1996
Τύπος Δημοσίευση σε Περιοδικό με Κριτές
Άδεια Χρήσης
Λεπτομέρειες
Βιβλιογραφική Αναφορά M. Makri, Y. Jiang, I. V. Yentekakis and C. G. Vayenas, "Oxidative coupling of methane to ethylene with 85 yield in a gasrecycle electrocatalytic or catalytic reactor-separator", Studies Surf. Sci. Catal., vol. 101. pp. 387-396, 1996. doi:10.1016/S0167-2991(96)80249-7 https://doi.org/10.1016/S0167-2991(96)80249-7
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Περίληψη

Methane was oxidatively coupled to ethylene with very high yield in a novel gas recycle reactor-separator operated in a batch or continuous flow mode. The recycled gas passes continuously through a molecular sieve trap in the recycle loop which adsorbs and thus protects from further oxidation a controllable percentage of ethylene and ethane. The products are obtained by subsequent heating of the molecular sieve trap. Ethylene yield up to 85%, i.e. 88% selectivity to ethylene at 97% CH4 conversion, has been obtained in the batch mode of operation using a Ag-Sm2O3 or Ag electrocatalyst and electrochemical supply of oxygen through a ZrO2-Y2O3 solid electrolyte. Using the continuous flow mode of oprration with gaseous O2 supply in the recycle loop and a Sr(1wt%)/La2O3 catalyst we have obtained ethylene yields up to 50%, i.e. 65% C2H4 selectivity at 76% CH4 conversion. The synergy of the catalytic and molecular sieve materials is discussed and modelled in view of the predominantly consecutive nature of the oxidative coupling of methane (OCM) network.

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