The Relationship between the Structural Characteristics of α-Fe2O3 Catalysts and Their Lattice Oxygen Reactivity Regarding Hydrogen | Sciact - CRIS-system of Boreskov Institute of Catalysis

The Relationship between the Structural Characteristics of α-Fe2O3 Catalysts and Their Lattice Oxygen Reactivity Regarding Hydrogen Full article

Journal

Materials
ISSN: 1996-1944

Output data

Year: 2023, Volume: 16, Number: 12, Article number : 4466, Pages count : 14 DOI: 10.3390/ma16124466

Tags

α-Fe2O3; catalysts; calcinations; XRD; XPS; Raman spectroscopy characterization; temperature-programmed reduction

Authors

Kirik Nadezhda ¹ , Krylov Alexander ² , Boronin Andrey ³ , Koshcheev Sergey ³ , Solovyov Leonid ¹ , Rabchevskii Evgenii ¹ , Shishkina Nina ¹ , Anshits Alexander ^1,4

Affiliations

1	Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Institute of Chemistry and Chemical Technology, 50/24, Akademgorodok, 660036 Krasnoyarsk, Russia
2	Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Kirensky Institute of Physics, 50/38, Akademgorodok, 660036 Krasnoyarsk, Russia
3	Federal Research Center Boreskov Institute of Catalysis, 5, Ac. Lavrentieva Ave., 630090 Novosibirsk, Russia
4	Department of Chemistry, 79, Svobodny Ave., Siberian Federal University, 660041 Krasnoyarsk, Russia

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

FWES-2021-0013

In this paper, the relationship between the structural features of hematite samples calcined in the interval of 800–1100 °C and their reactivity regarding hydrogen studied in the temperature-programmed reaction (TPR-H2) was studied. The oxygen reactivity of the samples decreases with the increasing calcination temperature. The study of calcined hematite samples used X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Raman spectroscopy, and their textural characteristics were studied also. According to XRD results, hematite samples calcined in the temperature range under study are monophase, represented by the α-Fe2O3 phase, in which crystal density increases with increasing calcination temperature. The Raman spectroscopy results also register only the α-Fe2O3 phase; the samples consist of large, well-crystallized particles with smaller particles on their surface, having a significantly lower degree of crystallinity, and their proportion decreases with increasing calcination temperature. XPS results show the α-Fe2O3 surface enriched with Fe2+ ions, whose proportion increases with increasing calcination temperature, which leads to an increase in the lattice oxygen binding energy and a decrease in the α-Fe2O3 reactivity regarding hydrogen.

Kirik N. , Krylov A. , Boronin A. , Koshcheev S. , Solovyov L. , Rabchevskii E. , Shishkina N. , Anshits A.
The Relationship between the Structural Characteristics of α-Fe2O3 Catalysts and Their Lattice Oxygen Reactivity Regarding Hydrogen
Materials. 2023. V.16. N12. 4466 :1-14. DOI: 10.3390/ma16124466 WOS Scopus РИНЦ ANCAN PMID OpenAlex

Submitted:	May 22, 2023
Accepted:	Jun 16, 2023
Published print:	Jun 19, 2023
Published online:	Jun 19, 2023

Web of science:	WOS:001020956200001
Scopus:	2-s2.0-85163807286
Elibrary:	54110359
Chemical Abstracts:	2023:1347489
Chemical Abstracts (print):	183:215309
PMID:	37374649
OpenAlex:	W4381436489

DB	Citing
Elibrary	5
OpenAlex	9
Scopus	8
Web of science	7