Chemical Composition of the Surface and Subsurface of Pt–Pd–Rh–Ru Catalytic Gauzes Used in the NH3 Oxidation with Air at 1133 K Full article
| Journal |
Catalysts
ISSN: 2073-4344 |
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| Output data | Year: 2022, Volume: 12, Number: 9, Article number : 930, Pages count : 28 DOI: 10.3390/catal12090930 | ||
| Tags | 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 | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0003 |
Abstract:
High-temperature oxidation of NH3 on Pt alloy gauzes to NO is widely employed in industry for the production of HNO3, which is used to obtain agricultural fertilizers. Particular attention is paid now to the investigation of the chemical composition of gauzes used in NH3 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 subsur-face layers of the new and used in NH3 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 (ОНad, COad), graphitic (Сgr) and oxide (Rh2O3) films were found on the surface of the metallic alloy. Under these films, Cab, Nab and Oab atoms absorbed in the subsurface layers were detected on the gauzes used in NH3 oxidation. The obtained data testify to the penetration of Oab and Nab atoms into deeper layers of the alloy during etching with elevation of the catalyst temperature. Oab atoms were ac-cumulated predominantly on dislocations, etch pits and grain boundaries, whereas Nab atoms intercalated mostly into interstitial sites of the alloy lattice.
Cite:
Salanov A.
, Serkova A.
, Kalinkin A.
, Isupova L.
, Parmon V.
Chemical Composition of the Surface and Subsurface of Pt–Pd–Rh–Ru Catalytic Gauzes Used in the NH3 Oxidation with Air at 1133 K
Catalysts. 2022. V.12. N9. 930 :1-28. DOI: 10.3390/catal12090930 WOS Scopus РИНЦ ANCAN OpenAlex
Chemical Composition of the Surface and Subsurface of Pt–Pd–Rh–Ru Catalytic Gauzes Used in the NH3 Oxidation with Air at 1133 K
Catalysts. 2022. V.12. N9. 930 :1-28. DOI: 10.3390/catal12090930 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Jul 20, 2022 |
| Accepted: | Aug 17, 2022 |
| Published print: | Aug 23, 2022 |
| Published online: | Aug 23, 2022 |
Identifiers:
| Web of science: | WOS:000858165800001 |
| Scopus: | 2-s2.0-85138622340 |
| Elibrary: | 52652110 |
| Chemical Abstracts: | 2022:2500617 |
| Chemical Abstracts (print): | 180:225237 |
| OpenAlex: | W4293029395 |