Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2
Abstract
:Highlights:
- Mn-Ce/FA-30%TiO2 (M) showed higher NO conversion than Mn-Ce/FA(M).
- Catalysts with higher TiO2 content demonstrated lower formation rates of N2O and NO2.
- With the Mn-Ce/FA-30%TiO2 (M), NO was mainly converted to N2 and N2O.
- SO2 preferentially reacted with NH3 to form ammonium sulfate to reduce the production of N2O.
- The hydroxyl groups in H2O inhibited the production of N2O.
1. Introduction
2. Experimental
2.1. Catalyst Preparation
2.2. Catalyst Characterization
2.3. Experimental System
2.4. Activity Evaluation Method
3. Results and Discussion
3.1. Characterization of Catalysts
3.1.1. BET Analysis
3.1.2. SEM Analysis
3.1.3. XRD Analysis
3.2. Effects of TiO2 Content on Catalyst Activity
3.3. Effects of Reaction Conditions on Catalytic Activity
3.3.1. Effect of Space Velocity
3.3.2. Effect of Oxygen Concentration
3.3.3. Effect of Ammonia to Nitrogen Ratio
3.4. Research on Sulfur and Water Resistances of Catalysts
3.4.1. Sulfur Resistance
3.4.2. Water Resistance
4. Conclusions
- (1)
- With the increase of TiO2 content, the NO conversion and denitration rates of catalysts increased, and the amount of NO2 and N2O decreased.
- (2)
- The rates of NO conversion, denitration and N2O formation of the Mn-Ce/FA (M) and the Mn-Ce/FA-30%TiO2 (M) increased with the increase of oxygen concentration and ammonia nitrogen ratio, and the decrease of space velocity. The NO2 formation rate was not affected by the change of space velocity and ammonia nitrogen ratio, but increased with the increase of oxygen concentration.
- (3)
- In the experiments of water and sulfur resistances, the rates of NO conversion and denitration of Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO2 (M) under 100 ppm SO2 and three percent H2O conditions decreased by about five percent, respectively, compared with water and sulfur free environment. It was found that H2O and SO2 had almost no effect on the production of NO2. The presence of SO2 could inhibit the excessive dehydrogenation of NH3 and decreased production of N2O. The hydroxyl groups in H2O could also inhibit the formation of N2O.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Catalysts | Surface Area (m2/g) | Pore Volume (cm3/g) |
---|---|---|
Mn-Ce/FA (M) | 10.56 | 0.034 |
Mn-Ce/FA-30%TiO2 (M) | 17.40 | 0.076 |
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Gou, X.; Wang, Y.; Wu, C.; Liu, S.; Zhao, D.; Li, Y.; Iram, S. Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2. Energies 2017, 10, 2084. https://doi.org/10.3390/en10122084
Gou X, Wang Y, Wu C, Liu S, Zhao D, Li Y, Iram S. Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2. Energies. 2017; 10(12):2084. https://doi.org/10.3390/en10122084
Chicago/Turabian StyleGou, Xiang, Yating Wang, Chunfei Wu, Shian Liu, Dong Zhao, Yamei Li, and Saima Iram. 2017. "Low Temperature Selective Catalytic Reduction Using Molding Catalysts Mn-Ce/FA and Mn-Ce/FA-30%TiO2" Energies 10, no. 12: 2084. https://doi.org/10.3390/en10122084