EFEITO DA BASICIDADE DO SUPORTE NO DESEMPENHO DE CATALISADORES BASEADOS EM PLATINA PARA A OBTENÇÃO DE ETILBENZENO A PARTIR DE N-OCTANO

CESÁRIO F. VIRGENS, ADRIANA D BALLARINI, MARIA DO CARMO RANGEL, JUANA I. DI COSIMO, SERGIO R. DE MIGUEL, JAVIER M. GRAU

Porto de Galinhas (Brasil).

Congreso; 14º Congresso Brasileiro de Catálise.; 2007

The effect of different kinds of basic supports on the performance of platinum-based catalysts was studied in this work, aiming to get monofunctional systems for the direct dehydrocyclization n-octane to produce ethylbenzene. It was found that the density of basic sites decreases in the order: K(Mg-Al)>KA+MgO>KA>KL It was concluded that the increase of basicity causes the electronic enrichment of platinum, which becomes able to dehydrocyclizate n-paraffins by the monofunctional mechanism; however, magnesium increases the basicity of the support but does not increase the ethylbenzene yield. In addition, the oxide-based catalysts are more stable than the zeolite-based ones but are less active and selective to ethylbenzene.