CONICET | Buscador de Institutos y Recursos Humanos

Co-ZSM-5 and Ni-ZSM-11 zeolites were obtained by hydrothermal method. Co and Ni containing zeolites were prepared by: wetness impregnation and ion-exchange. The molecular sieves were characterized by several physicochemical techniques: AA, XRD and FTIR. The catalytic properties of different samples have been analyzed in the oxidation of styrene with H2O2 as oxidant, acetonitrile as solvent, at 60°C, and different molar ratios of styrene/hydrogen peroxide. Benzaldehyde was obtained as the main reaction products. Catalytic behavior is reported in terms of styrene conversion (mol %). An increment of styrene conversion when styrene/H2O2 molar ratio decreased from 3 to 1.7 was observed over Co and Ni samples prepared by both impregnation and ion-exchange methods. Ion-exchange Co-HZSM-5 sample presented the major styrene conversion (25.98 mol %) at 7 h and R:1.7, this behavior probably is associated at the minor Brönsted/Lewis ratio compared with the impregnated Co-zeolites and Ni-zeolites. It was observed a high selectivity to benzaldehyde (82.98 a 99.87 mol %) over the samples. 2O2 as oxidant, acetonitrile as solvent, at 60°C, and different molar ratios of styrene/hydrogen peroxide. Benzaldehyde was obtained as the main reaction products. Catalytic behavior is reported in terms of styrene conversion (mol %). An increment of styrene conversion when styrene/H2O2 molar ratio decreased from 3 to 1.7 was observed over Co and Ni samples prepared by both impregnation and ion-exchange methods. Ion-exchange Co-HZSM-5 sample presented the major styrene conversion (25.98 mol %) at 7 h and R:1.7, this behavior probably is associated at the minor Brönsted/Lewis ratio compared with the impregnated Co-zeolites and Ni-zeolites. It was observed a high selectivity to benzaldehyde (82.98 a 99.87 mol %) over the samples.

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