Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity

Hari Prasad Uppara, Harshini Dasari, Sunit Kumar Singh, Nitin K. Labhsetwar, M. S. Murari

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Abstract: A series of Fe substituted (B-site doping) by Cu on the GdFeO3 perovskite materials (GdFe1−xCuxO3±δ, x = 0 to 0.3) were synthesized using EDTA-Citrate method. The effect of Cu loading on the physio-chemical investigations of the obtained samples was carried out using X-ray Diffraction technique, BET surface area analysis, FESEM/EDS, TEM analysis, XPS, H2-TPR, and Soot-TPR. The performance of perovskites towards soot oxidation was analyzed in detail using TGA equipment. The results of the XRD pattern shows that upto10 mol% of Cu doping was dissolved into the lattice of GdFeO3. H2-TPR results reveal that the samples with Cu loading exhibit the successive reductions of Cu2+, Fe3+, and Fe2+ which implies the presence of multiple oxidation states in the perovskite. This induces the oxygen vacancies in the doped samples (due to charge compensation) leading to an increase in soot oxidation activity. According to the XPS results it was observed that the surface composition of Gd is in +3, Fe in +2 and +3 and Cu in +2 oxidation states. Moreover, the O1s peaks of the doped samples clearly evidenced an increase in adsorbed oxygen species when compared to the un-doped one. Among the doped samples, 10 mol% of Cu loading in GdFeO3 showed the higher activity of oxygen species. The T50% (temperature at 50% conversions) of the samples was in the order of GFCu30% < GFCu10% < GFCu5% < GFCu15% < GdFeO3 < bare soot. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)3097-3110
Number of pages14
JournalCatalysis Letters
Volume149
Issue number11
DOIs
Publication statusPublished - 01-11-2019
Externally publishedYes

Fingerprint

Soot
Perovskite
Copper
Doping (additives)
Oxidation
X ray photoelectron spectroscopy
Oxygen
Ethylenediaminetetraacetic acid
Oxygen vacancies
Edetic Acid
Citric Acid
Surface structure
Energy dispersive spectroscopy
Transmission electron microscopy
X ray diffraction
perovskite
Temperature

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Uppara, H. P., Dasari, H., Singh, S. K., Labhsetwar, N. K., & Murari, M. S. (2019). Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity. Catalysis Letters, 149(11), 3097-3110. https://doi.org/10.1007/s10562-019-02843-2
Uppara, Hari Prasad ; Dasari, Harshini ; Singh, Sunit Kumar ; Labhsetwar, Nitin K. ; Murari, M. S. / Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity. In: Catalysis Letters. 2019 ; Vol. 149, No. 11. pp. 3097-3110.
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Uppara, HP, Dasari, H, Singh, SK, Labhsetwar, NK & Murari, MS 2019, 'Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity', Catalysis Letters, vol. 149, no. 11, pp. 3097-3110. https://doi.org/10.1007/s10562-019-02843-2

Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity. / Uppara, Hari Prasad; Dasari, Harshini; Singh, Sunit Kumar; Labhsetwar, Nitin K.; Murari, M. S.

In: Catalysis Letters, Vol. 149, No. 11, 01.11.2019, p. 3097-3110.

Research output: Contribution to journalArticle

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T1 - Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity

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AU - Murari, M. S.

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N2 - Abstract: A series of Fe substituted (B-site doping) by Cu on the GdFeO3 perovskite materials (GdFe1−xCuxO3±δ, x = 0 to 0.3) were synthesized using EDTA-Citrate method. The effect of Cu loading on the physio-chemical investigations of the obtained samples was carried out using X-ray Diffraction technique, BET surface area analysis, FESEM/EDS, TEM analysis, XPS, H2-TPR, and Soot-TPR. The performance of perovskites towards soot oxidation was analyzed in detail using TGA equipment. The results of the XRD pattern shows that upto10 mol% of Cu doping was dissolved into the lattice of GdFeO3. H2-TPR results reveal that the samples with Cu loading exhibit the successive reductions of Cu2+, Fe3+, and Fe2+ which implies the presence of multiple oxidation states in the perovskite. This induces the oxygen vacancies in the doped samples (due to charge compensation) leading to an increase in soot oxidation activity. According to the XPS results it was observed that the surface composition of Gd is in +3, Fe in +2 and +3 and Cu in +2 oxidation states. Moreover, the O1s peaks of the doped samples clearly evidenced an increase in adsorbed oxygen species when compared to the un-doped one. Among the doped samples, 10 mol% of Cu loading in GdFeO3 showed the higher activity of oxygen species. The T50% (temperature at 50% conversions) of the samples was in the order of GFCu30% < GFCu10% < GFCu5% < GFCu15% < GdFeO3 < bare soot. Graphic Abstract: [Figure not available: see fulltext.].

AB - Abstract: A series of Fe substituted (B-site doping) by Cu on the GdFeO3 perovskite materials (GdFe1−xCuxO3±δ, x = 0 to 0.3) were synthesized using EDTA-Citrate method. The effect of Cu loading on the physio-chemical investigations of the obtained samples was carried out using X-ray Diffraction technique, BET surface area analysis, FESEM/EDS, TEM analysis, XPS, H2-TPR, and Soot-TPR. The performance of perovskites towards soot oxidation was analyzed in detail using TGA equipment. The results of the XRD pattern shows that upto10 mol% of Cu doping was dissolved into the lattice of GdFeO3. H2-TPR results reveal that the samples with Cu loading exhibit the successive reductions of Cu2+, Fe3+, and Fe2+ which implies the presence of multiple oxidation states in the perovskite. This induces the oxygen vacancies in the doped samples (due to charge compensation) leading to an increase in soot oxidation activity. According to the XPS results it was observed that the surface composition of Gd is in +3, Fe in +2 and +3 and Cu in +2 oxidation states. Moreover, the O1s peaks of the doped samples clearly evidenced an increase in adsorbed oxygen species when compared to the un-doped one. Among the doped samples, 10 mol% of Cu loading in GdFeO3 showed the higher activity of oxygen species. The T50% (temperature at 50% conversions) of the samples was in the order of GFCu30% < GFCu10% < GFCu5% < GFCu15% < GdFeO3 < bare soot. Graphic Abstract: [Figure not available: see fulltext.].

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Uppara HP, Dasari H, Singh SK, Labhsetwar NK, Murari MS. Effect of Copper Doping Over GdFeO3 Perovskite on Soot Oxidation Activity. Catalysis Letters. 2019 Nov 1;149(11):3097-3110. https://doi.org/10.1007/s10562-019-02843-2