Pd and Pd-Cu supported on different carbon materials and immobilized as flow-through catalytic membranes for the chemical reduction of NO3-, NO-2 and BrO3- in drinking water treatment

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

Mari, A (Autor) Outra; Baeza, JA (Autor) Outra; Pedrosa, M (Autor) FEUP; O.S.G.P. Soares (Autor) FEUP; Calvo, L (Autor) Outra; Gilarranz, MA (Autor) Outra; Silva, Adrian (Autor) FEUP; Manuel Fernando R Pereira (Autor) FEUP

Revista

Título: Journal of Environmental Chemical Engineering

Vol. 11

ISSN: 2213-3437

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Projetos Associados

Healthy Waters - Healthy Waters - Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications

Outras Informações

ID Authenticus: P-00Y-7SH

DOI: 10.1016/j.jece.2023.109772

Abstract (EN): Powdered catalysts are commonly used in lab-scale tests for the catalytic reduction of oxoanions in drinking water, but their powder nature limits their application at full scale. In this work, Pd and Pd-Cu catalysts (5% wt.) supported on carbon materials with different structural properties, in powder form, were used to prepare catalytic membranes that were tested in a reactor with flow-through configuration (FTCMR) to study their performance in the reduction of NO3 -, NO2- and BrO3- . Pd catalytic membranes showed high activity in the reduction of NO2- , being the selectivity to NH4+lower than 2% at 80% NO2- conversion in all cases. In BrO3- reduction, they exhibited a wide range of conversions being the catalyst supported on materials with high conductivity the most active ones, which may be ascribed to the charge distribution at the metal-carbon interface. NO3 - reduction using Pd-Cu catalytic membranes showed that catalysts supported on materials with small nanoparticle size and low electrical conductivity exhibited higher selectivity to NH4+. FTCMR led to a good control of H2 transfer and availability in the active sites, facilitating the tuning of H2 availability conditions to preserve the activity, while maintaining/diminishing selectivity to NH4+. In simultaneous oxoanions reduction tests, NO3 - reduction was inhibited by Br species, probably by affection of the Pd-Cu redox cycle. This fact could be crucial to the future development of drinking water treatment processes, as conditions the order of the disinfection and NO3 - reduction steps.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11