“CATALISADORES DO TIPO Pt/KY COM DIFERENTES SAR EMPREGADOS NA PRODUÇÃO DE ETILBENZENO”

M. O. SOUZA, J. M. GRAU, R. V. T. DE ALBURQUERQUE, P. M. MADELA, A. C. FARO JR., S. G. MARCHETTI, L. A. A. MARCANO, M. C. RANGEL.

Gramado, Rio Grande do Sul, Brasil

Simposio; “XX Simposio Iberoamericano de Catálisis”; 2006

The production of etylbenzene was investigated for the octane reforming reaction using Pt catalysts supported on KY zeolites. The Si/Al ratios were 9, 17 and 25. Pt supported in KL zeolite was also used for comparison. The concentration of platinum (1%) was close to the nominal values in all samples. FTIR of adsorbed CO and XPS results indicate that largest SAR produces platinum species with higher electronic densities. The Y zeolite-supported catalysts showed initial conversion close to 100%. The sample with Si/Al 9 ratio had the largest decrease in conversion and largest amount of coke deposition, followed by sample with Si/Al 17 and 25 ratio. The increase in the Si/Al ratio improves the catalytic activity, selectivity and stability. The catalyst supported on the support with Si/Al 25 ratio was the most promising sample. Its activity at 300 minutes TOS, measured through the conversion (X=56,9%) and the yield to EtBz (DEtBz= 9,3%), were higher that a sample PtKL  zeolite. DEtBz= 9,3%), were higher that a sample PtKL  zeolite.DEtBz= 9,3%), were higher that a sample PtKL  zeolite.