Abstract: The evolution of a nickel-containing catalyst based on a mixed oxide substrate obtained from vermiculite etching solutions has been investigated using the methods of Moessbauer and EXAFS spectroscopy, XRD, and transmission electron microscopy. The catalyst manifests high activity in the process of methane vapor reforming (MVR) and is resistant to low sulfur hydride content. Upon the deposition of active components (Ni-La) and thermal treatment at 900°C, the phases of nickel oxide and superparamagnetic particles of γ-Fe2O3 distributed in the structure of the mixed spinel of a composition Mg(FeAl)O4 ± δ are formed on the catalyst surface. In the course of the preliminary reduction activation by hydrogen, the surface phases interact with the formation of hybrid systems of a core-shell type with a size of 15–17 nm. The core comprises particles of the reduced α-Fe, invar alloy: γ-FeNi and α-FeNi surrounded by a shell of superparamagnetic clusters of γ-Fe2O3 1–4 nm in size with a strong interaction with the nucleus and isostructural mixed oxide with the structure of spinel. After catalysis in the MVR process, at T = 790–820°C the particles of the catalyst containing 30 ppm of H2S become enlarged up to 40–45 nm without a change in shape. The particle enlargement occurs as a result of the increase in the core size, whereas the shell size remains unchanged. It is assumed that the shell decomposes sulfur hydride until elementary sulfur, whereas the system core manifests high activity in the MVR process.

Cite: Tsodikov M.V. , Kurdyumov S.S. , Murzin V.Y. , Maksimov Y.V. , Imshennik V.K. , Novichikhin S.V. , Maksimovskii E.A. , Kriventsov V.V.
Restructurings in the Catalyst for Methane Vapor Reforming Resistant to Sulfur Hydride Impurity: Configuration of Catalytically Active Nanocomponents of a Core (Invar FeNi)-Shell (γ-Fe2O3) Type
Nanotechnologies in Russia. 2012. V.7. N9-19. P.471-481. DOI: 10.1134/S1995078012050151 Scopus РИНЦ OpenAlex

Original: Цодиков М.В. , Курдюмов С.С. , Мурзин В.Ю. , Максимов Ю.В. , Имшенник В.К. , Новичихин С.В. , Максимовский Е.А. , Кривенцов В.В.
Структурные перестройки катализатора парового риформинга метана, устойчивого к примеси сероводорода: конфигурация каталитически активных нанокомпонентов «ядро (инвар FeNi)-оболочка(γ-Fе2O3)»
Российские нанотехнологии. 2012. Т.7. №9-10. С.36-43. RSCI РИНЦ

Dates:

Submitted:	Apr 17, 2012
Accepted:	May 16, 2012
Published print:	Sep 1, 2012
Published online:	Oct 17, 2012

Identifiers:

Scopus:	2-s2.0-84867732583
Elibrary:	20497033
OpenAlex:	W2017996874

Citing:

DB	Citing
Scopus	1
Elibrary	2
OpenAlex	1

Altmetrics: