Effect of nanoparticle size in Pt/SiO₂ catalyzed nitrate reduction in liquid phase
Shafqat, Khawer; Pitkäaho, Satu; Tiainen, Minna; Matějová, Lenka; Keiski, Riitta L. (2021-01-14)
Shafqat, K.; Pitkäaho, S.; Tiainen, M.; Matějová, L.; Keiski, R.L. Effect of Nanoparticle Size in Pt/SiO₂ Catalyzed Nitrate Reduction in Liquid Phase. Nanomaterials 2021, 11, 195. https://doi.org/10.3390/nano11010195
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe202103298692
Tiivistelmä
Abstract
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.
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