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Title: Каталитическая коррозия платины, палладия и родия в процессе окисления аммиака
Other Titles: Catalytical etching of platinum, palladium and rhodium in the oxidation of ammonia
Authors: Кочурова, Н. М.
metadata.dc.contributor.advisor: Саланов, А. Н.
Keywords: коррозия; платина; родий; окисление; аммиак; высокотемпературное окисление; кислород
Issue Date: 2018
Publisher: Издательский Дом Томского государственного университета
Citation: Кочурова Н. М. Каталитическая коррозия платины, палладия и родия в процессе окисления аммиака / Н. М. Кочурова ; науч. рук. А. Н. Саланов // Перспективы развития фундаментальных наук : сборник научных трудов XV Международной конференции студентов, аспирантов и молодых ученых, г. Томск, 24-27 апреля 2018 г. : в 7 т. — Томск : Издательский Дом Томского государственного университета, 2018. — Т. 2 : Химия. — [С. 156-158].
Abstract: To reveal the mechanism of the catalytic etching of platinum catalyst gauzes during the NH[3] oxidation, we carried out detailed investigation of the surface microstructure of platinum catalysts treated in the reaction medium (NH[3]+O[2]). The SEM study of a polycrystalline surface microstructure on platinum, palladium, and rhodium after treatment in the NH[3] + reaction air for 1 and 5 hours shows a different microstructural rearrangement of the surface. After the catalytic reaction of ammonia oxidation for 1 hour, platinum forms a granular structure with shallow furrows 1 to 4 [mu]m wide and indistinct grain boundaries. After a 5-hour reaction of catalytic ammonia oxidation, the grain boundaries are more clearly identified, the grooves on the grains are arranged in parallel and their size is 1-2 [mu]m. The photomicrographs obtained on palladium show that the entire surface of palladium is covered with agglomerates with a fibrous structure after the first hour. The size of the fibrous agglomerates varies from 2 to 10 [mu]m. After catalytic oxidation of ammonia for 5 hours on palladium is formed а deep structural reconstruction of the foil (catalytic corrosion). On rhodium for 1 hour, it is seen that light stretched regions with a width of about 2 [mu]m are located on the surface. Light, elongated areas are represented by the accumulation of rhodium nano- and microcrystals. After oxidation of ammonia on the rhodium for 5 hours, rhodium oxidation leads to the formation of a continuous surface layer of crystals of rhodium oxide.
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