“Actividad y Selectividad de Pt-Sn-In/Al2O3 en deshidrogenación de mezclas de n-hexano con metilciclopentano o penteno”

M.C. RIBOLDI; J.M. GRAU

Gramado, Brasil

Simposio; XX Simposio Ibero Americano de Catalisis; 2006

Sociedad Brasilera de Catálisis

The changes in activity and selectivity of a PtSnIn/Al2O3-K catalyst doped with pentene (C5=) or methylcyclopentene (MCC5) at different conversion values were studied. The reaction was performed in the presence of H2 at 450 ºC and 1 atm, varying the space velocity WHSV between 0,5 and 2 h-1. The study is performed fresh and coked catalysts alter a fase deactivation stage in which the H2 that participates in the reaction is replaced by N2 to favor polymerization. The residual activity degree is measured with the reaction of cyclohexane dehydrogenation and the degree of polimerization of the deposited coke, by temperatura programmed oxidation (TPO). It is found that both dopants increase the conversion of the catalyst. C5= addition favors both the cracking and the MCC5 reaction, the production of cyclohexane and benzene. The coke percentages obtained at WHSV=0,5 were 1,46% for pure nC6 puro, 1,84% for its mixture with C5= (max. polymerization degree) and 6,34% for mixtures with MCC5.