Role of the alumina surface properties on the ammonia production during the NOx SCR with ethanol over Ag/Al2O3 catalysts
Résumé
he Selective Catalytic Reduction of NOx with ethanol (EtOH-SCR) was studied over Ag/Al2O3 catalysts, with a special attention to the ammonia emission and its possible implication in the reaction mechanism. Five alumina supports were selected, three provided by commercial manufacturers and two synthesized in our laboratory. These solids were impregnated with 2wt.% silver, and tested in EtOH-SCR. The results showed that the catalytic activity of Ag/Al2O3 greatly depends on the used alumina. Besides, the maximum ammonia yield varies between 6 and 27% at 723 K, with total NOx conversion. Catalysts were characterized by pyridine adsorption monitored by infrared spectroscopy. A correlation is proposed between the formation of NH3 and the Lewis Acid Sites (LAS) density of each alumina support.
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