Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Effect of platinum nanoparticle size on catalytic reduction of nitrate in liquid phase was examined under ambient conditions by using hydrogen as a reducing agent. For the size effect study, Pt nanoparticles with sizes of 2, 4 and 8 nm were loaded silica support. TEM images of Pt nanoparticles showe...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-01, Vol.11 (1), p.195
Main Authors: Shafqat, Khawer, Pitkäaho, Satu, Tiainen, Minna, Matějová, Lenka, Keiski, Riitta L.
Format: Article
Language:English
Subjects:
Catalysts
Catalytic activity
Chemical reduction
Drinking water
Ethanol
Hydrogenation
Liquid phases
Methods
Morphology
Nanoparticles
Nitrate reduction
Nitrates
Platinum
Pore size
Reagents
Reducing agents
Selectivity
Silica
Silicon dioxide
Size effects
Transmission electron microscopy
wastewater
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Summary:Effect of platinum nanoparticle size on catalytic reduction of nitrate in liquid phase was examined under ambient conditions by using hydrogen as a reducing agent. For the size effect study, Pt nanoparticles with sizes of 2, 4 and 8 nm were loaded silica support. TEM images of Pt nanoparticles showed that homogeneous morphologies as well as narrow size distributions were achieved during the preparation. All three catalysts showed high activity and were able to reduce nitrate below the recommended limit of 50 mg/L in drinking water. The highest catalytic activity was seen with 8 nm platinum; however, the product selectivity for N2 was highest with 4 nm platinum. In addition, the possibility of PVP capping agent acting as a promoter in the reaction is highlighted.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano11010195