%0 Journal Article
%T Preferential oxidation of CO in presence of H2 behavior OF PtSn/γ -Al2O3 catalysts modified by K or Ba
%A Siri
%A G. J.
%A Bertolini
%A G. R.
%A Ferretti
%A O. A.
%J Latin American applied research
%D 2007
%I Scientific Electronic Library Online
%X the behavior of catalysts based on pt/¦Ã-al2o3 is analyzed in the co oxidation reaction. experiments were performed in the temperature range between 50¡ãc and 250¡ãc with a feed h2 rich, and a concentration of 1% co and 0.6% o2 catalysts studied were: monometallic pt/¦Ã-al2o3, bimetallic ptsn/¦Ã-al2o3 with a ratio sn/pt=1.6 at/at and two catalysts prepared by modification of the last one with k or ba. the catalyst that showed maximum activity and selectivity levels is the ptsnk/¦Ã-al2o3. the tin addition increases the activity which allows the reaction to occur at lower temperatures due to the decrease in the co-pt interaction. the addition of k or ba produces a subsequent improvement with respect to the co oxidation temperature, which leads to a selectivity increase. the selectivity of the co oxidation passes through a maximum value as a function of the temperature. this maximum is explained by the importance acquired by the reverse of water gas shift reaction at temperatures near 200oc.
%K preferential oxidation
%K hydrogen purification
%K ptsn/¦Ã -al2o3.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S0327-07932007000400008&lng=en&nrm=iso&tlng=en