Activity and stability of Pd bimetallic catalysts for catalytic nitrate reduction
EntityUAM. Departamento de Ingeniería Química
10.3390/catal12070729Catalysts 12.7 (2022): 729
ProjectGobierno de España. PID2019-108445RB-I00; Gobierno de España. PDC2021-120755-I00; Comunidad de Madrid. S2018/EMT-4344/BIOTRES-CM
SubjectsCatalyst; Nitrites; Denitrification; Química
Rights© 2022 by the authors
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
In this work, we study the effect of modifying the metal loading (0.5–1.5 wt.% Pd and 0.1– 1 wt.% Sn or In), the impregnation order of noble or promoter metal (Pd–Sn or Sn–Pd), and the type of promoter metal (Sn or In) during the preparation process for a Pd bimetallic catalyst, supported on γ-alumina, used in the catalytic reduction of nitrate. The deposition of the noble metal over the promoter metal, especially with Pd:Sn ratios (wt.) of 1:10 and 1:2, favored the hydrogen spillover rate and increased the H concentration on the catalyst surface, enhancing NH4+ production. On the other hand, Pd–In catalysts showed higher activity than the Sn catalysts, as well as higher NH4+ selectivity. The stability of the Pd–Sn/Al2O3 (1.5–1 wt.%) catalyst was evaluated in long-term experiments for the treatment of synthetic water (100 mg L−1 NO3−) and three different commercial drinking waters. This Pd–Sn/Al2O3 catalyst achieved a stable nitrate conversion for a duration of 50 h in the synthetic water treatment. However, the catalyst showed a significant activity loss in the presence of other ions (different to NO3−) in the reaction medium, increasing slightly the selectivity to NH4+
Google Scholar:Sanchis, Ines - Rodríguez Jiménez, Juan José - Fernández Mohedano, Ángel - Díaz Nieto, Elena
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