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Chemical Composition of the Surface and Subsurface of Pt−Pd−Rh−Ru Catalytic Gauzes Used in the $NH_{3}$ Oxidation with Air at 1133 К
| Content Provider | MDPI |
|---|---|
| Author | Salanov, Aleksei Serkova, Alexandra Kalinkin, Alexandr Isupova, Lyubov Parmon, Valentin |
| Copyright Year | 2022 |
| Description | High-temperature oxidation of $NH_{3}$ on Pt alloy gauzes to NO is widely employed in industry for the production of $HNO_{3}$, which is used to obtain agricultural fertilizers. Particular attention is paid now to the investigation of the chemical composition of gauzes used in $NH_{3}$ oxidation. X-ray photoelectron and energy-dispersive X-ray spectroscopies with the depth of analysis ca. 5 nm and ca. 500 nm were applied to investigate the chemical composition of surface and subsurface layers of the new and used in $NH_{3}$ oxidation with air at T = 1133 K Pt−Pd−Rh−Ru catalytic gauzes (81, 15, 3.5, 0.5 wt.%, respectively). For all the gauzes, adsorption $(ОН_{ad}$, $CO_{ad}$), graphitic $(С_{gr}$) and oxide $(Rh_{2}O_{3}$) films were found on the surface of the metallic alloy. Under these films, $C_{ab}$, $N_{ab}$ and $O_{ab}$ atoms absorbed in the subsurface layers were detected on the gauzes used in $NH_{3}$ oxidation. The obtained data testify to the penetration of $O_{ab}$ and $N_{ab}$ atoms into deeper layers of the alloy during etching with elevation of the catalyst temperature. $O_{ab}$ atoms were accumulated predominantly on dislocations, etch pits and grain boundaries, whereas $N_{ab}$ atoms intercalated mostly into interstitial sites of the alloy lattice. |
| Starting Page | 930 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal12090930 |
| Journal | Catalysts |
| Issue Number | 9 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-23 |
| Access Restriction | Open |
| Subject Keyword | Catalysts High-temperature Ammonia Oxidation Catalytic Etching of Platinum Alloy Gauzes Chemical Composition of Platinum Alloy Gauzes Scanning Electron Microscopy Energy-dispersive X-ray Spectroscopy X-ray Photoelectron Spectroscopy |
| Content Type | Text |
| Resource Type | Article |
