Oxidation of Acid-proof Steel Foil as a Method of Deposition of Phases Active in Nitrogen Oxides Decomposition on Metallic Monolith Walls

Abstract

Pieces of 1H18N9T acid-proof steel foil were subjected to thermoprogrammed oxidation up to 823K, 873K, 1023K and 1113K in air flow. The phases in the oxide layers were determined by Raman spectroscopy. The chemical compositions of the surface microlayers of oxidized foils were investigated by energy dispersive X-ray spectrometry and the chemical compositions of their surface nanolayers were determined by X-ray photoelectron spectrometry. The affinity to oxygen of the foil components was found to be a main factor determining chemical composition and phase structure of the oxides.

Raman Microspectroscopy as a Unique Method of the Investigation of Acid Proof Steel Foil Oxidation

“…Recently our interest is focused on oxidation of the metallic monoliths manufactured from the 1H18N9T acid proof steel foil [2]. The spinel phases and Me 2 O 3 type oxides are formed on channel walls of those monoliths during the oxidation.…”

“…The morphology, as well as chemical and phase composition of the surface layers of the oxidized monolith channels, strongly depends on the oxidation temperature [2].…”

“…The knowledge of the influence of the conditions of the oxidation on phase composition and morphology of the oxide layers is very important for designing the procedure of the monolithic catalyst production [2,3].…”