%0 Journal Article
%T Oxidative dehydrogenation of N-butane over VMgO catalysts supported and promoted with molybdenum or gallium
%A PAPA
%A JOS¨¦
%A MARZUKA
%A SAMIR
%A BRITO
%A JOAQU¨ªN L
%A GUAR¨¢N
%A NURY
%J Revista de la Facultad de Ingenier¨ªa Universidad Central de Venezuela
%D 2006
%I Scientific Electronic Library Online
%X the present study investigates the n-butane oxidative dehydrogenation (odh) using vmgo catalysts supported on sio2 or promoted with different amounts of gallium or molybdenum. the mg/v atomic ratio used for all catalysts was four. experiments were performed in a fixed bed reactor within the temperature range of 480 to 540oc and a residence time the range of 6 to 50 (gcat min moltotal-1). the need for catalysts previously stabilized in order to avoid changes in behavior with time on run was demonstrated. the vmgo unsupported and unpromoted phase showed a good level of activity (conversions of ¡À30% at a contact time of 50 [gcat min moltotal-1] and a temperature of 540¡ãc) with selectivities toward unsaturated hydrocarbons in the order of 90%. in order to increase the catalyst resistance to attrition, this active phase was supported on sio2 (30% by weight). the activity and selectivity of this catalyst was somewhat lower than the observed on the unsupported phase but still interesting. the additions of molybdenum or gallium oxides with an atomic ratio (mo/v or ga/v) in the range 0.1 to 1.0 show instead to have mixed effects. molybdenum promotes the selectivity toward butylenes but with a reduction in activity. instead, gallium introduces a rather small effect.
%K n-butane
%K oxidative dehydrogenation
%K supported
%K promoted
%K vanadium
%K gallium
%K molybdenum catalysts.
%U http://www.scielo.org.ve/scielo.php?script=sci_abstract&pid=S0798-40652006000200011&lng=en&nrm=iso&tlng=en