Effect of Sn addition in alumina- and silica-supported palladium catalysts for n-butane dehydrogenation(Dehydrogenation of n-butane over supported palladium catalysts)
Efecto de la adición de estaño en catalizadores de paladio soportados sobre alúmina y sílice para la deshidrogenación de n-butano(Deshidrogenación de n-butano en catalizadores de paladio soportado)
Abstract
Dehydrogenation of n-butane was studied over alumina- and silica-supported Pd and Pd-Sn catalysts with 0.5 wt. % of Pd. The reaction was carried out at 500 °C in both continuous flow and pulses systems. The catalysts were prepared by incipient wetness impregnation. For the bimetallic catalysts, the sequential impregnation method was used adding first Sn and then Pd, with Sn/Pd atomic ratios of 0.1, 0.25 and 0.5. The samples were characterized by XRF, UV-DRS, N2 adsorption, TPR, CO chemisorption and FTIR-CO techniques. On the supported-alumina catalysts, Pd oxychloride were formed, which is highly resistant to the reduction, and it is responsible for the high Pd dispersion. On the supported-silica catalysts, the addition of Sn modifies both the reducibility and adsorption capacity of Pd. The effects of Sn were mainly of geometric nature when supported on alumina, and both geometric and electronic nature when supported on silica. On the supported-alumina catalysts, the Sn addition increases the selectivity toward butenes, due to the high stabilization of Pd species; while on the supported-silica catalysts, greater Pd-Sn interactions are evidenced, where the catalyst properties are strongly influenced at the lowest content of Sn added. The alumina–supported bimetallic catalysts showed the best performance for n-butane dehydrogenation among the catalysts investigated herein.
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