Investigation of Structural-Phase Conversion of an Iron-Containing Catalyst by Mössbauer Spectroscopy (Part 2)

The active form of an iron-containing catalyst, an Fe(II, III) mixed oxide, was studied by Mössbauer spectroscopy in order to identify the mechanism of formation of catalysts used for upgrading of heavy oil from Ashalchinsk field. The iron-oxide phase participates in the formation process by breakin...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2021-03, Vol.88 (1), p.92-96
Main Authors: Mukhamatdinov, I. I., Pyataev, A. V., Zaripova, R. D., Khaidarova, A. R., Vakhin, A. V.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Asphaltenes
Atomic/Molecular Structure and Spectra
Catalysts
Chemical bonds
Hydrogen sulfide
Hydrogenation
Hydrogenolysis
Hydrolysis
Investigations
Iron oxides
Iron sulfides
Magnetite
Mossbauer spectroscopy
Oxides
Physics
Physics and Astronomy
Pyrite
Pyrrhotite
Spectrum analysis
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Summary:The active form of an iron-containing catalyst, an Fe(II, III) mixed oxide, was studied by Mössbauer spectroscopy in order to identify the mechanism of formation of catalysts used for upgrading of heavy oil from Ashalchinsk field. The iron-oxide phase participates in the formation process by breaking carbon–heteroatom bonds in high-molecular-mass components (resins and asphaltenes) of heavy oil and reduces their molecular mass. Thus, the disperse iron oxides are enriched in a sulfur-containing phase. Mathematical processing of Mössbauer spectra obtained during the experiment was used to study the quantitative composition of the products of thermocatalytic action at 300°C. Magnetite (Fe 3 O 4 ), greigite (Fe 3 S 4 ), pyrite (FeS 2 ), and pyrrhotite (Fe 1–x S) were mainly detected in the isolated catalysts. The magnetite content decreased toward formation of iron sulfides (pyrite and pyrrhotite). Hydrogen sulfide and hydrocarbons were formed as a result of cracking, hydrolysis, and hydrogenolysis reactions at 300°C.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-021-01145-z