Compositional and Fabrication Cycle Optimization of Ceria-Zirconia-Supported Mo-Based Catalysts for NH3-SCR NOx Reduction
Abstract
:1. Introduction
2. Results and Discussion
3. Materials and Methods
- Cerium and zirconium precursors are dissolved in deionized water to achieve a total cation concentration of 0.1M; parallelly, a diluted ammonia solution (1M NH3) is prepared.
- Both solutions are stirred vigorously for 15 min to ensure complete dissolution and homogenization of the different precursors.
- An appropriate amount of the ammonia solution is gradually added to the cations-containing solution, either at room temperature in the case of sole support (doped/undoped ceria) or in a reflux setup at around 90 °C in the case of precursors containing molybdenum. This latter step is performed to ensure a significant excess of the base at a high temperature, leading to the formation of a Mo-containing powder precursor.
- After precipitation, the resulting suspensions are aged for a short period (several minutes), filtered, and thoroughly washed with deionized water and ethanol (to favor the complete elimination of Cl ions).
- Finally, all the co-precipitates are dried overnight at 80 °C and subsequently calcined at 450 °C for 1 h.
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Sample Labeling | Composition | Mo Addition | Precipitation Temperature |
---|---|---|---|
CeZr0Mo10_imp | 10MoO3/CeO2 | Impregnation | r.t. |
CeZr15Mo10_imp | 10MoO3/Ce0.85Zr0.15O2 | Impregnation | r.t. |
CeZr30Mo10_imp | 10MoO3/Ce0.70Zr0.30O2 | Impregnation | r.t. |
CeZr0Mo10_copr | 10MoO3/CeO2 | Co-precipitation | 90 °C |
CeZr15Mo10_copr | 10MoO3/Ce0.85Zr0.15O2 | Co-precipitation | 90 °C |
CeZr30Mo10_copr | 10MoO3/Ce0.70Zr0.30O2 | Co-precipitation | 90 °C |
Sample | a (Calculated) [nm] | a (Vegard’s Law) [nm] | Crystal Size [nm] |
---|---|---|---|
CeZr0Mo10_imp | 0.54266 | 0.54113 | 11.1 |
CeZr15Mo10_imp | 0.54080 | 0.53690 | 5.3 |
CeZr30Mo10_imp | 0.53795 | 0.53266 | 7.8 |
Sample | a (Calculated) [nm] | a (Vegard’s Law) [nm] | Crystal Size [nm] |
---|---|---|---|
CeZr0Mo10_copr | 0.54225 | 0.54113 | 9.5 |
CeZr15Mo10_copr | 0.54227 | 0.53690 | 5.4 |
CeZr30Mo10_copr | 0.54047 | 0.53266 | 4.0 |
Sample | Sbet (m2 g−1) a | Vp (cm3 g−1) | Adsorbed NH3 (µmol g−1) | H2 Uptake (µmol g−1) |
---|---|---|---|---|
CeZr0Mo10_copr | 113 | 0.302 | 203 | 1133 |
CeZr15Mo10_copr | 108 | 0.164 | 171 | 1351 |
CeZr30Mo10_copr | 118 | 0.117 | 174 | 1402 |
CeZr0Mo10_imp | 75 | 0.239 | 140 | 955 |
CeZr15Mo10_imp | 116 | 0.116 | 194 | 1081 |
CeZr30Mo10_imp | 92 | 0.090 | 144 | 1374 |
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Spiridigliozzi, L.; Monfreda, V.; Esposito, S.; Tammaro, O.; Blangetti, N.; Deorsola, F.A.; Dell’Agli, G. Compositional and Fabrication Cycle Optimization of Ceria-Zirconia-Supported Mo-Based Catalysts for NH3-SCR NOx Reduction. Inorganics 2024, 12, 217. https://doi.org/10.3390/inorganics12080217
Spiridigliozzi L, Monfreda V, Esposito S, Tammaro O, Blangetti N, Deorsola FA, Dell’Agli G. Compositional and Fabrication Cycle Optimization of Ceria-Zirconia-Supported Mo-Based Catalysts for NH3-SCR NOx Reduction. Inorganics. 2024; 12(8):217. https://doi.org/10.3390/inorganics12080217
Chicago/Turabian StyleSpiridigliozzi, Luca, Viviana Monfreda, Serena Esposito, Olimpia Tammaro, Nicola Blangetti, Fabio Alessandro Deorsola, and Gianfranco Dell’Agli. 2024. "Compositional and Fabrication Cycle Optimization of Ceria-Zirconia-Supported Mo-Based Catalysts for NH3-SCR NOx Reduction" Inorganics 12, no. 8: 217. https://doi.org/10.3390/inorganics12080217