Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)
Abstract
:1. Introduction
2. Results and Discussion
2.1. Structure by XRD and Raman Measurements
2.2. Texture and Morphology
2.3. Surface Acidity and Oxidation States
2.4. Catalytic Results
2.4.1. Temperature Effects
2.4.2. Stability of the Catalysts against Poisons
3. Materials and Methods
3.1. Nb2O5 Supported Transition Metal Catalysts Preparation
3.2. Characterizations
3.3. Catalytic Activity Tests
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Catalysts | a Total Acidity (µmol NH3·g−1) | Density of the Acid Sites (µmol NH3·m−2) | Textural Properties | ||
---|---|---|---|---|---|
BET Surface Area (m2·g−1) | Pore Volume (cm3·g−1) | b Pore Diameter (Å) | |||
Nb2O5 | 275 | 3.2 | 87 | 0.16 | 46 |
CoMo/Nb2O5 | 88.5 | 1.8 | 50 | 0.10 | 38 |
NiMo/Nb2O5 | 358 | 8.3 | 43 | 0.09 | 35 |
PtMo/Nb2O5 | 438 | 17.5 | 25 | 0.06 | 21 |
Sample | C 1s | O 1s | Nb 3d5/2 | Mo 3d5/2 | Co 2p3/2 | Pt 4f7/2 |
---|---|---|---|---|---|---|
Nb2O5 | 284.8 (80) 286.2 (12) 288.6 (8) | 530.0 (90) 531.6 (10) | 207.0 | - | - | - |
CoMo/Nb2O5 | 284.8 (76) 286.7 (11) 289.0 (13) | 530.2 (85) 531.6 (15) | 207.2 | 232.4 | 780.5 | - |
PtMo/Nb2O5 | 284.8 (83) 286.2 (13) 288.9 (4) | 530.4 (90) 531.8 (10) | 207.3 | 231.7 (29) 232.9 (71) | - | 71.6 (16) 73.0 (70) 74.6 (14) |
PtMo/ Nb2O5 Spent | 284.8 (78) 286.4 (18) 288.7 (4) | 530.4 (89) 532.0 (11) | 207.3 | 231.7 (19) 232.9 (81) | - | 71.4 (80) 72.7 (20) |
Sample | C | O | Nb | Mo | Co | Pt | Mo/Nb | Pt/Nb | Co/Nb |
---|---|---|---|---|---|---|---|---|---|
Nb2O5 | - | 56.14 | 21.62 | - | - | - | - | - | - |
CoMo/Nb2O5 | - | 53.98 | 16.67 | 2.75 | 5.38 | - | 0.165 | - | 0.035 |
PtMo/Nb2O5 | - | 54.38 | 17.82 | 4.53 | - | 0.78 | 0.254 | 0.042 | - |
PtMo/Nb2O5 Spent | 20.27 | 57.03 | 17.74 | 4.53 | - | 0.32 | 0.255 | 0.018 | - |
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Nascimento, J.P.S.; Oton, L.F.; Oliveira, A.C.; Rodríguez-Aguado, E.; Rodríguez-Castellón, E.; Araujo, R.S.; Souza, M.S.; Lang, R. Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co). Catalysts 2020, 10, 1048. https://doi.org/10.3390/catal10091048
Nascimento JPS, Oton LF, Oliveira AC, Rodríguez-Aguado E, Rodríguez-Castellón E, Araujo RS, Souza MS, Lang R. Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co). Catalysts. 2020; 10(9):1048. https://doi.org/10.3390/catal10091048
Chicago/Turabian StyleNascimento, João Pedro S., Lais F. Oton, Alcineia C. Oliveira, Elena Rodríguez-Aguado, Enrique Rodríguez-Castellón, Rinaldo S. Araujo, Monique S. Souza, and Rossano Lang. 2020. "Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)" Catalysts 10, no. 9: 1048. https://doi.org/10.3390/catal10091048