Mechanochemical Synthesis and Catalytic Properties of the Calcium Ferrite Ca2Fe2O5 Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2002, Volume: 43, Number: 1, Pages: 122-128 Pages count : 7 DOI: 10.1023/A:1014217716883 | ||||
Tags | Ferrite; Calcination; Oxygen Vacancy; Calcination Temperature; Nitrosyl | ||||
Authors |
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Affiliations |
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Funding (1)
1 | Russian Foundation for Basic Research | 99-03-32836 |
Abstract:
The formation of the real structure of calcium ferrite prepared by the calcination of a mechanochemically activated hydroxide mixture at 600–1100°C was studied by X-ray diffraction analysis, electron microscopy, thermal analysis, Moessbauer spectroscopy, IR spectroscopy, small-angle X-ray scattering, and secondary-ion mass spectrometry. It was found that low-temperature calcium ferrite is an anion-modified oxide, in which the ordering of oxygen vacancies was incomplete. Regions with a disordered structure were detected on the surface of crystallites. As the calcination temperature was increased, the brownmillerite crystal structure was improved and the intercrystalline boundaries were formed and then annealed. At the surface, these processes were accompanied by a change in the predominant form of adsorbed NO from nitrosyl to dinitrosyl species. An increase in the specific catalytic activity of samples with calcination temperature can be associated with the perfection of the brownmillerite structure and with a change in the state of adsorption centers.
Cite:
Isupova L.A.
, Tsybulya S.V.
, Kryukova G.N.
, Budneva A.A.
, Paukshtis E.A.
, Litvak G.S.
, Ivanov V.P.
, Kolomiichuk V.N.
, Pavlyukhin Y.T.
, Sadykov V.A.
Mechanochemical Synthesis and Catalytic Properties of the Calcium Ferrite Ca2Fe2O5
Kinetics and Catalysis. 2002. V.43. N1. P.122-128. DOI: 10.1023/A:1014217716883 WOS Scopus РИНЦ
Mechanochemical Synthesis and Catalytic Properties of the Calcium Ferrite Ca2Fe2O5
Kinetics and Catalysis. 2002. V.43. N1. P.122-128. DOI: 10.1023/A:1014217716883 WOS Scopus РИНЦ
Original:
Исупова Л.А.
, Цыбуля С.В.
, Крюкова Г.Н.
, Буднева А.А.
, Паукштис Е.А.
, Литвак Г.С.
, Иванов В.П.
, Коломийчук В.Н.
, Павлюхин Ю.Т.
, Садыков В.А.
Механохимический синтез и каталитические свойства феррита кальция - Ca2Fe2O5
Кинетика и катализ. 2002. Т.43. №1. С.132-139. РИНЦ
Механохимический синтез и каталитические свойства феррита кальция - Ca2Fe2O5
Кинетика и катализ. 2002. Т.43. №1. С.132-139. РИНЦ
Dates:
Submitted: | Mar 29, 2000 |
Published print: | Jan 1, 2002 |
Identifiers:
Web of science | WOS:000174318000019 |
Scopus | 2-s2.0-0038575858 |
Elibrary | 13404190 |
Chemical Abstracts | 2002:218850 |
Chemical Abstracts (print) | 136:222247 |
OpenAlex | W11048394 |