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Applied Catalysis A: General, 90 (1992) 159-174 Elsevier Science Publishers B.V., Amsterdam

Summary: Applied Catalysis A: General, 90 (1992) 159-174
Elsevier Science Publishers B.V., Amsterdam
Potassium/calcium/nickel oxide catalysts for oxidative
coupling of methane
Kerry M. Dooley' and Julian R.H. Ross2
Department of Chemical Technology, Technical University of Twente, P.O. Box 217, 7500 EA
Enschede (Netherlands)
(Received26 May 1992,revisedmanuscriptreceived5 August1992)
A seriesof potassium/calcium/nickeloxidesweretestedfor the oxidativecouplingof methane(OCM)
at 843-943 K and wateraddition to the feed at O-65 mol-%. The K/Ni ratios variedfrom 0.0-0.6 and
Ca/Ni from 0.0-11; catalystswith no nickel werealso tested.At least 10% waterin the feed and tem-
peratureslowerthan ca. 940 K werenecessaryto keep nickel-containingcatalystsfrom convertingto
purelysteamreforming/combustion behavior. Catalystaof low (lessthan 4) Ca/Ni werethe most ac-
tive, with a maximumCz selectivity,which increasedwith temperature,of 37% at 11% C2yield (28%
waterin feed,933 K). Catalystsof high (4-11) Ca/Ni ratiowerelessactive,with a maximumC, selec-
tivity of 32% at 7.1% Cayield (43% waterin feed, 923 K). Previousclaims of highersel&ivities for
similarcatalystacould not be reproducedexceptat shorttimeson stream,in the absenceof substantial


Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente


Collections: Engineering