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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

Title
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
Type
Article in International Scientific Journal
Year
2023
Authors
Mari, A
(Author)
Other
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Baeza, JA
(Author)
Other
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Calvo, L
(Author)
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Gilarranz, MA
(Author)
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Manuel Fernando R Pereira
(Author)
FEUP
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Journal
Vol. 11
ISSN: 2213-3437
Publisher: Elsevier
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Publicação em ISI Web of Knowledge ISI Web of Knowledge - 0 Citations
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Other information
Authenticus ID: P-00Y-7SH
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.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 11
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