Enhancing the Performance of BaxMnO3 (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Catalysts Characterization
3.1.1. Chemical, Morphological and Structural Properties
3.1.2. Surface Composition
3.1.3. Redox Properties
3.2. Catalytic Activity
4. Conclusions
- The synthesis procedure allowed for achieving a perovskite-type structure, as confirmed by XRD data.
- XPS data substantiated the coexistence of a Mn(IV)/Mn(III) pair on the surface of the samples and, also, the presence of surface oxygen vacancies, being particularly prominent for B0.7M.
- The presence of oxygen vacancies in the Ba-deficient perovskites lattice allows us to increase the reducibility of samples and the oxygen mobility.
- The higher amount of oxygen vacancies and the improved reducibility of the Ba-deficient samples boosted the catalytic activity for the CO oxidation reaction of BM, even though the 1% Pt/Al2O3 reference sample still presents the best performance.
- B0.7M is the most active catalyst from the BxM series, as it presents the highest amount of oxygen vacancies on the surface (XPS), the highest reducibility (H2-TPR) and lattice oxygen mobility (O2-TPD and CO-TPR).
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Molecular Formula | Nomenclature | BET Surface Area (m2 g−1) | Chemical Composition (%) | Cell Parameters (Å) 1 | Average Crystallite Size (nm) | Lattice Strain | |||
---|---|---|---|---|---|---|---|---|---|
Ba | Mn | O | a | c | |||||
BaMnO3 | BM | 9 | 62 | 24 | 14 | 5.7 | 4.8 | 24.8 | 3 × 10−4 |
Ba0.9MnO3 | B0.9M | 8 | 58 | 27 | 15 | 5.7 | 4.8 | 27.2 | 3 × 10−5 |
Ba0.8MnO3 | B0.8M | 10 | 56 | 29 | 15 | 5.7 | 4.8 | 26.7 | 4 × 10−5 |
Ba0.7MnO3 | B0.7M | 11 | 55 | 30 | 15 | 5.7 | 4.8 | 26.2 | 2 × 10−4 |
Catalyst | Mn (IV)/Mn (III) | Mn (III)s (%) | Mn (IV)s (%) | XPS OL/(Ba + Mn) (Nominal) |
---|---|---|---|---|
BM | 0.2 | 20 | 4 | 1.2 (1.5) |
B0.9M | 0.4 | 19 | 8 | 1.0 (1.6) |
B0.8M | 0.4 | 21 | 8 | 1.0 (1.7) |
B0.7M | 0.5 | 20 | 10 | 1.1 (1.8) |
Catalyst | Amount of O2 Consumed (μmol O2 (g cat)−1) | Percentage of O2 Consumed (%) |
---|---|---|
BM | 845 | 14 |
B0.9M | 1040 | 16 |
B0.8M | 1030 | 15 |
B0.7M | 1330 | 18 |
Catalyst | O2 Involved (μmol O2 (g cat)−1) 1 | Percentage of O2 Involved (%) 2 | CO Converted (%) 3 | |||
---|---|---|---|---|---|---|
Cycle 1 | Cycle 2 | Cycle 1 | Cycle 2 | Cycle 1 | Cycle 2 | |
BM | 1678 | 1855 | 27 | 30 | 8 | 9 |
B0.9M | 1601 | 1501 | 24 | 23 | 8 | 7 |
B0.8M | 1164 | 1029 | 17 | 15 | 5 | 5 |
B0.7M | 1763 | 1652 | 23 | 22 | 8 | 7 |
Catalyst | T50% (°C) | ΔT50%,CO (°C) 1 | ΔT50%,O2 (°C) 2 | ||
---|---|---|---|---|---|
0.1%CO/1%O2/He | 1%CO/1%O2/He | 1%CO/10%O2/He | |||
BM | 364 | 446 | 364 | 82 | −82 |
B0.9M | 276 | 343 | 352 | 67 | 9 |
B0.8M | 313 | 423 | 377 | 110 | −46 |
B0.7M | 249 | 307 | 303 | 58 | −4 |
1% Pt/Al2O3 | 164 | 212 | 204 | 48 | −8 |
Sample | Mn (IV)/Mn (III) | XPS OL/(Ba + Mn) | Mn 3p Position (eV) |
---|---|---|---|
Fresh B0.7M | 0.5 | 1.1 | 50 |
Spent B0.7M | 0.3 | 0.2 | 49 |
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Díaz-Verde, Á.; Illán-Gómez, M.J. Enhancing the Performance of BaxMnO3 (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content. Nanomaterials 2024, 14, 1334. https://doi.org/10.3390/nano14161334
Díaz-Verde Á, Illán-Gómez MJ. Enhancing the Performance of BaxMnO3 (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content. Nanomaterials. 2024; 14(16):1334. https://doi.org/10.3390/nano14161334
Chicago/Turabian StyleDíaz-Verde, Á., and M. J. Illán-Gómez. 2024. "Enhancing the Performance of BaxMnO3 (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content" Nanomaterials 14, no. 16: 1334. https://doi.org/10.3390/nano14161334