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Open AccessArticle

Nitrate Catalytic Reduction over Bimetallic Catalysts: Catalyst Optimization

Laboratory of Separation and Reaction Engineering—Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
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Received: 12 October 2020 / Revised: 19 November 2020 / Accepted: 26 November 2020 / Published: 28 November 2020
(This article belongs to the Collection Feature Papers in the Science and Engineering of Carbons)
The catalytic removal of nitrate (NO3) in water using hydrogen as a reducing agent was studied using palladium-copper bimetallic catalysts in different supports. Commercial carbon nanotubes (CNTs), used as received and with different mechanical (CNT (BM 2h)) and chemical modifications (CNT (BM 4h)-N), titanium dioxide (TiO2) and composite materials (TiO2-CNT) were considered as main supports for the metallic phase. Different metal loadings were studied to synthesize an optimized catalyst with high NO3 conversion rate and considerable selectivity for N2 formation. Among all the studied support materials, the milled carbon nanotubes (sample CNT (BM 2h) was the support that showed the most promising results using 1%Pd-1%Cu as metallic phases. The most active catalysts were 2.5%Pd-2.5%Cu and 5%Pd-2.5%Cu supported on CNT (BM 2h), achieving total conversion after a 120 min reaction with N2 selectivity values of 62% and 60%, respectively. Reutilization experiments allowed us to conclude that these catalysts were stable during several reactions, in terms of NO3 conversion rate. However, the consecutive reuse of the catalyst leads to major changes concerning NH4+ selectivity values. View Full-Text
Keywords: catalytic reduction; nitrate removal; bimetallic catalysts; carbon nanotubes; titanium dioxide catalytic reduction; nitrate removal; bimetallic catalysts; carbon nanotubes; titanium dioxide
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MDPI and ACS Style

Santos, A.S.G.G.; Restivo, J.; Orge, C.A.; Pereira, M.F.R.; Soares, O.S.G.P. Nitrate Catalytic Reduction over Bimetallic Catalysts: Catalyst Optimization. C 2020, 6, 78. https://0-doi-org.brum.beds.ac.uk/10.3390/c6040078

AMA Style

Santos ASGG, Restivo J, Orge CA, Pereira MFR, Soares OSGP. Nitrate Catalytic Reduction over Bimetallic Catalysts: Catalyst Optimization. C. 2020; 6(4):78. https://0-doi-org.brum.beds.ac.uk/10.3390/c6040078

Chicago/Turabian Style

Santos, A. S.G.G.; Restivo, João; Orge, Carla A.; Pereira, M. F.R.; Soares, O. S.G.P. 2020. "Nitrate Catalytic Reduction over Bimetallic Catalysts: Catalyst Optimization" C 6, no. 4: 78. https://0-doi-org.brum.beds.ac.uk/10.3390/c6040078

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