Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties
Abstract
:1. Introduction
2. Results
2.1. Properties of the Dried Samples
2.1.1. Phase Composition
2.1.2. TG and DTG Measurements
2.2. Properties of the Calcined Precursors
2.2.1. Chemical Composition
2.2.2. Phase Composition
2.2.3. Textural Properties
2.2.4. Reducibility
2.2.5. Basicity
2.2.6. FTIR
2.2.7. Surface Composition
2.2.8. Species-Resolved Thermal Alkali Desorption (SR-TAD)
2.2.9. Activity of the Catalysts in Decomposition of NO
2.2.10. Effect of O2 and CO2 in the Reactant on Catalytic Activity
3. Discussion
4. Materials and Methods
4.1. Preparation of Catalysts
4.2. Characterization of the Samples
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | DTG_1 Tmax, °C | DTG_2 Tmax, °C | DTG_3 Tmax, °C | ∆TG_1 % | ∆TG_2 % | ∆TG_3 % |
---|---|---|---|---|---|---|
“1” | 113 | 201 | 558 | −9.5 | −17.4 | −3.7 |
“2” | 131 | 206 | Nd a | −11.9 | −14.8 | −2.7 |
“3” | 132 | 201 | 438 | −11.6 | −14.0 | −3.2 |
“4” | 136 | 213 | 445 | −13.9 | −18.4 | −1.5 |
“5” | 136 | 193 | 448 | −13.7 | −13.5 | −3.6 |
Sample | H2O | NO2 | NO | CO2 |
---|---|---|---|---|
“1” | 184; 269 | 126; 242; 293 | 287; 702 | 144; 249; 297; 535 |
“3” | 164; 245 | 139; 274; 400 | 272; 520 | 136; 289; 366; 668 |
“5” | 95; 187; 245 | 106; 281; 400 | 242 | 148; 229; 290; 400; 628 |
Sample | Wt.% | Molar Ratio | |||
---|---|---|---|---|---|
K | Co | Mn | Al | Co:Mn:Al:K | |
“1” | 18.90 | 28.2 | 6.0 | 3.0 | 4:0.9:0.9:4.0 |
“2” | 8.20 | 40.0 | 8.8 | 4.0 | 4:1.3:1.2:1.7 |
“3” | 2.39 | 45.4 | 10.2 | 4.7 | 4:1.5:1.5:0.5 |
“4” | 0.92 | 46.8 | 10.2 | 4.7 | 4:1.6:1.5:0.2 |
“5” | 0.60 | 45.6 | 9.9 | 4.4 | 4:0.9:1.4:0.1 |
BP | 2.10 | 48.9 | 11.2 | 5.1 | 4:0.9:1.5:0.4 |
Sample | SBET (m2/g) | Smeso (m2/g) | Vtot (mm3liq/g) | Vmicro (mm3liq/g) | Ld (nm) | a (nm) |
---|---|---|---|---|---|---|
“1” | <1 | – | – | – | 9 | 0.81056 ± 7 × 10−5 |
“2” | 58 | 32 | 266 | 13 | 8 | 0.81187 ± 17 × 10−5 |
“3” | 110 | 69 | 401 | 22 | 7 | 0.81109 ± 5 × 10−5 |
“4” | 105 | 66 | 435 | 21 | 8 | 0.81209 ± 4 × 10−5 |
“5” | 102 | 66 | 435 | 21 | 9 | 0.81153 ± 4 × 10−5 |
BP | 94 | Nd. * | 460 | 64 | 9 | 0.81015 ± 4 × 10−5 |
Sample | H2-TPR Tmax, °C | H2-TPR a mmol g−1 | CO2-TPD Tmax, °C | CO2-TPD a mmol g−1 |
---|---|---|---|---|
“1” | 376; 438 b | 18.24 | - | 0.03 |
“2” | 290; 614 | 12.62 | 120; 275; 444 | 0.18 |
“3” | 362; 709 | 6.61 | 101; 203; 350 | 0.16 |
“4” | 368; 726 | 6.29 | 101; 202 | 0.09 |
“5” | 371; 756 | 5.67 | 101; 202 | 0.10 |
BP | 375; 755 | 6.82 | 105; 277; 630 | 0.16 |
Sample | Co 2p At. % | Mn 2p At. % | Al 2p At. % | C 1s At. % | K 2p At. % | O 1s At. % | O 1s eV (rel. %) | O 1s eV (rel. %) |
---|---|---|---|---|---|---|---|---|
“1” | 6.8 | 2.4 | 5.1 | 28.7 | 10.1 | 46.9 | 529.7 (45.8) | 531.5 (54.2) |
“2” | 9.5 | 2.9 | 6.2 | 34.8 | 3.6 | 43.1 | 529.7 (63.5) | 531.5 (36.5) |
“3” | 9.1 | 4.0 | 7.0 | 34.1 | 2.4 | 43.5 | 529.7 (67.8) | 531.5 (32.2) |
“4” | 9.0 | 3.5 | 8.6 | 35.9 | 0.5 | 42.7 | 529.8 (56.7) | 531.4 (43.3) |
“5” | 9.1 | 3.7 | 9.2 | 32.5 | 0.1 | 45.3 | 529.9 (59.1) | 531.5 (40.8) |
BP | 13.7 | 6.1 | 8.1 | 12.5 | 5.2 | 54.4 | 530.0 (84.5) | 531.7 (15.5) |
Sample | K | Co | Mn | Al | O |
---|---|---|---|---|---|
“1” | 22.1 (18.9) | 21.8 (28.2) | 7.2 (6.0) | 7.6 (3.0) | 41.3 (43.9) |
“2” | 8.2 (8.2) | 32.6 (40.0) | 9.2 (8.8) | 9.7 (4.0) | 40.2 (39.0) |
“3” | 5.5 (2.4) | 30.8 (45.4) | 12.8 (10.2) | 10.9 (4.7) | 40.1 (37.3) |
“4” | 1.1 (0.9) | 32.1 (46.8) | 11.6 (10.2) | 14.0 (4.7) | 41.3 (37.4) |
“5” | 0.3 (0.6) | 31.2 (45.6) | 11.9 (9.9) | 14.4 (4.4) | 42.1 (39.5) |
BP | 8.3 (2.1) | 33.1 (48.9) | 13.9 (11.2) | 9.0 (5.1) | 35.7 (32.7) |
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Jirátová, K.; Pacultová, K.; Balabánová, J.; Karásková, K.; Klegová, A.; Bílková, T.; Jandová, V.; Koštejn, M.; Martaus, A.; Kotarba, A.; et al. Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties. Catalysts 2019, 9, 592. https://doi.org/10.3390/catal9070592
Jirátová K, Pacultová K, Balabánová J, Karásková K, Klegová A, Bílková T, Jandová V, Koštejn M, Martaus A, Kotarba A, et al. Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties. Catalysts. 2019; 9(7):592. https://doi.org/10.3390/catal9070592
Chicago/Turabian StyleJirátová, Květa, Kateřina Pacultová, Jana Balabánová, Kateřina Karásková, Anna Klegová, Tereza Bílková, Věra Jandová, Martin Koštejn, Alexandr Martaus, Andrzej Kotarba, and et al. 2019. "Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties" Catalysts 9, no. 7: 592. https://doi.org/10.3390/catal9070592