TY - JOUR

T1 - The effect of transition metal substitution in the perovskite-type oxides on the physicochemical properties and the catalytic performance in diesel soot oxidation

AU - Yafarova, Liliya V.

AU - Mamontov, Grigory V.

AU - Chislova, Irina V.

AU - Silyukov, Oleg I.

AU - Zvereva, Irina A.

N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/10/19

Y1 - 2021/10/19

N2 - The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by var-ious methods: X-Ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorp-tion, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an im-provement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.

AB - The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by var-ious methods: X-Ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorp-tion, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an im-provement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.

KW - Perovskites

KW - Soot oxidation

KW - Temperature-programmed reaction

KW - Transition metal oxides

KW - perovskites

KW - NO

KW - MN

KW - COMBUSTION

KW - transition metal oxides

KW - temperature-programmed reaction

KW - CO

KW - soot oxidation

KW - CALCINATION TEMPERATURE

KW - METHANE PARTIAL OXIDATION

KW - REMOVAL

KW - RARE-EARTH

KW - XPS

KW - LATTICE OXYGEN

UR - http://www.scopus.com/inward/record.url?scp=85117697470&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/4526de2e-5d01-3f65-9dfa-2b7fb7204fe2/

U2 - 10.3390/catal11101256

DO - 10.3390/catal11101256

M3 - Article

AN - SCOPUS:85117697470

VL - 11

JO - Catalysts

JF - Catalysts

SN - 2073-4344

IS - 10

M1 - 1256

ER -