| Title: | Catalytically Active Oxidized ▫$PtO_x$▫ Species on ▫$SnO_2$▫ Supports Synthesized via Anion Exchange Reaction for 4-Nitrophenol Reduction |
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| Authors: | ID Đurasović, Izabela (Author)
ID Peter, Robert (Author)
ID Dražić, Goran (Author)
ID Faraguna, Fabio (Author)
ID Anelić, Rafael (Author)
ID Marciuš, Marijan (Author)
ID Jurkin, Tanja (Author)
ID Mohaček-Grošev, Vlasta (Author)
ID Gracheva, Maria (Author)
ID Klencsár, Zoltan (Author)
ID Ivanda, Mile (Author)
ID Štefanić, Goran (Author)
ID Gotić, Marijan (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/2079-4991/15/15/1159
 PDF - Presentation file, download (14,17 MB)
MD5: EAF86E1DA694CBCCDD900649C7BDB7FF
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  KI - National Institute of Chemistry
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| Abstract: | An anion exchange-assisted technique was used for the synthesis of platinum-decorated SnO2 supports, providing nanocatalysts with enhanced activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). In this study, a series of SnO2 supports, namely SnA (synthesized almost at room temperature), SnB (hydrothermally treated at 180 ◦C), and SnC (annealed at 600 ◦C), are systematically investigated, all loaded with 1 mol% Pt from H2PtCl6 under identical mild conditions. The chloride ions from the SnCl4 precursors were efficiently removed via a strong-base anion exchange reaction, resulting in highly dispersed, crystalline ~5 nm cassiterite SnO2 particles. All Pt/SnO2 composites displayed mesoporous structures with type IVa isotherms and H2-type hysteresis, with SP1a (Pt on SnA) exhibiting the largest surface area (122.6 m2/g) and the smallest pores (~3.5 nm). STEM-HAADF imaging revealed well-dispersed PtOx domains (~0.85 nm), while XPS confirmed the dominant Pt4+ and Pt2+ species, with ~25% Pt0 likely resulting from photoreduction and/or interactions with Sn–OH surface groups. Raman spectroscopy revealed three new bands (260–360 cm−1) that were clearly visible in the sample with 10 mol% Pt and were due to the vibrational modes of the PtOx species and Pt-Cl bonds introduced due the addition and hydrolysis of H2PtCl6 precursor. TGA/DSC analysis revealed the highestmass loss for SP1a (~7.3%), confirming the strong hydration of the PtOx domains. Despite the predominance of oxidized PtOx species, SP1a exhibited the highest catalytic activity (kapp = 1.27 × 10−2 s−1) and retained 84.5% activity for the reduction of 4-NP to 4-AP after 10 cycles. This chloride-free low-temperature synthesis route offers a promising and generalizable strategy for the preparation of noble metal-based nanocatalysts on oxide supports with high catalytic activity and reusability. |
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| Keywords: | platinum, SnO2, anion exchange, Dowex 550, catalyst, 4-nitrophenol, 119Sn Mössbauer |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.07.2025 |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 1-28 |
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| Numbering: | Vol. 15, iss. 15, ǂ[article no.] ǂ1159 |
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| PID: | 20.500.12556/DiRROS-23644  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 2079-4991 |
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| DOI: | 10.3390/nano15151159 |
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| COBISS.SI-ID: | 249312003 |
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| Copyright: | © 2025 by the authors. Licensee MDPI, Basel, Switzerland. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 17. 9. 2025;
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| Publication date in DiRROS: | 18.09.2025 |
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| Views: | 327 |
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| Downloads: | 175 |
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