Innovative In/H-SSZ-39 Catalysts: An Exploration in NOx Reduction via CH4-SCR
Abstract
:1. Introduction
2. Results and Discussion
2.1. Effect of Preparation Conditions
2.1.1. Si/Al Ratio
2.1.2. Effect of Calcination Temperature
2.1.3. Effect of In Ions Concentration
2.2. Effect of Reaction Conditions
2.2.1. CH4/NO Ratio
2.2.2. O2 Concentration
2.2.3. Gaseous Hourly Space Velocity
2.2.4. H2O Concentrations
2.3. Long Run Test
2.4. Stability Test
2.5. Characteristics of Used In/H-SSZ-39 after CH4-SCR in the Presence of H2O
3. Experimental
3.1. Catalyst Preparation
3.2. Catalytic Activity Measurements
3.3. Catalyst Characterizations
4. Conclusions and Perspectives
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Catalyst | Reaction Conditions | NOx Removal Efficiency (%) | Reaction Temperature (°C) | Reference |
---|---|---|---|---|
Co-Beta | 2180 ppm NO, 2050 ppm CH4, 2% O2, 78 ppm SO2, and a GHSV of 7500 h−1 | 32% | 600 | [19] |
In/H-Beta | 400 ppm NO, 400 ppm CH4, 10 % O2, 100 ppm SO2, 5 % H2O, and a GHSV of 23,600 h−1 | 31% | 600 | [6] |
In/H-Beta-P | 400 ppm NO, 400 ppm CH4, 10 % O2, 100 ppm SO2, 5 % H2O, and a GHSV of 23,600 h−1 | 40% | 650 | [20] |
In/H-SSZ-13 | 2500 ppm NO, 4000 ppm CH4, 4% O2, 6 % H2O, and a GHSV of 75,000 h−1 | 38% | 500 | [21] |
In/H-SSZ-39 | 400 ppm NO, 600 ppm CH4, 10 % O2, 6 % H2O, and a GHSV of 21,000 h−1 | 42.1% | 625 | Our work |
Catalysts | Content of In (wt.%) | Content of Al (wt.%) | Content of Si (wt.%) | Si/Al |
---|---|---|---|---|
In/H-SSZ-39 (Si/Al = 4.9) | 5.68 | 3.98 | 19.50 | 4.9 |
In/H-SSZ-39 (Si/Al = 16) | 5.5 | 2.45 | 40.33 | 16 |
Used In/H-SSZ-39 | 5.1 | 2.47 | 41.31 | 16 |
Sample | Peak I | Peak II | Peak III | Qtotal (mmol g−1) | |||
---|---|---|---|---|---|---|---|
T (°C) | Q (mmol g−1) | T (°C) | Q (mmol g−1) | T (°C) | Q (mmol g−1) | ||
In/H-SSZ-39 (Si/Al = 16) | 178 | 1.098 | 477 | 0.186 | 546 | 0.529 | 1.813 |
In/H-SSZ-39 (Si/Al = 4.9) | 168 | 1.045 | 489 | 0.209 | 560 | 0.110 | 1.365 |
Used In/H-SSZ-39 | 175 | 1.022 | 466 | 0.186 | 579 | 0.434 | 1.642 |
Sample | InO+/(InO+ + In2O3 + In(OH)3−zz+) |
---|---|
In/H-SSZ-39 (450 °C) | 0.45 |
In/H-SSZ-39 (500 °C) | 0.49 |
In/H-SSZ-39 (550 °C) | 0.36 |
In/H-SSZ-39 (600 °C) | 0.34 |
Used In/H-SSZ-39 | 0.40 |
Catalyst | SBET a (m2g−1) | Vtotal b (cm3g−1) | Vmeso c (cm3g−1) | dmeso d (nm) |
---|---|---|---|---|
Fresh In/H-SSZ-39 | 548.02 | 0.29 | 0.09 | 2.76 |
Used In/H-SSZ-39 | 541.11 | 0.29 | 0.07 | 2.00 |
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Zhao, J.; Jiang, J.; Wang, M.; Chen, J.; Li, J.; Wang, X.; Zhu, R. Innovative In/H-SSZ-39 Catalysts: An Exploration in NOx Reduction via CH4-SCR. Catalysts 2024, 14, 582. https://doi.org/10.3390/catal14090582
Zhao J, Jiang J, Wang M, Chen J, Li J, Wang X, Zhu R. Innovative In/H-SSZ-39 Catalysts: An Exploration in NOx Reduction via CH4-SCR. Catalysts. 2024; 14(9):582. https://doi.org/10.3390/catal14090582
Chicago/Turabian StyleZhao, Jiuhu, Jingjing Jiang, Meng Wang, Jianxiong Chen, Jin Li, Xianbin Wang, and Rongshu Zhu. 2024. "Innovative In/H-SSZ-39 Catalysts: An Exploration in NOx Reduction via CH4-SCR" Catalysts 14, no. 9: 582. https://doi.org/10.3390/catal14090582