Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment
Abstract
:1. Introduction
2. Results and Discussion
3. Experimental
3.1. Catalyst Preparation
3.2. Characterization
3.3. Methane Combustion Reaction
3.3.1. Temperature-Programed (TP) Reaction
3.3.2. Isothermal Reaction
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | XRD | CO Chemisorption | N2 Sorption | |||
---|---|---|---|---|---|---|
Crystal Size a (nm) | Pd Dispersion (%) | Pd Particle Size (nm) | SBET (m2 g−1) | VP b (cm3 g−1) | DP c (nm) | |
ZrO2 (support) | 10.3 | - | - | 63 | 0.226 | 14.4 |
Pd/ZrO2(500) | 10.6 | 27.7 | 4.0 | 58 | 0.210 | 14.5 |
Pd/ZrO2(600) | 10.2 | 25.0 | 4.5 | 59 | 0.219 | 14.8 |
Pd/ZrO2(700) | 10.2 | 21.0 | 5.4 | 59 | 0.219 | 14.9 |
Pd/ZrO2(800) | 10.8 | 13.5 | 8.3 | 59 | 0.222 | 15.0 |
Pd/ZrO2(900) | 10.9 | 3.0 | 37.7 | 54 | 0.205 | 15.3 |
Sample | Without Activation a | With Activation a | ||||
---|---|---|---|---|---|---|
T5 (°C) | T50 (°C) | T80 (°C) | T5 (°C) | T50 (°C) | T80 (°C) | |
Pd/ZrO2 (500) | 373 | 429 | 460 | 368 | 434 | 541 |
Pd/ZrO2 (600) | 380 | 433 | 460 | 368 | 426 | 467 |
Pd/ZrO2 (700) | 384 | 433 | 460 | 365 | 424 | 449 |
Pd/ZrO2 (800) | 396 | 450 | 482 | 380 | 443 | 474 |
Pd/ZrO2 (900) | 411 | 553 | - | 443 | 562 | - |
Sample | Non-Activated | Activated | ||||
---|---|---|---|---|---|---|
Peak Position (°C) (Relative Portion of Peak Area, %) | Peak Position (°C) (Relative Portion of Peak Area, %) | |||||
α | β | γ | α | β | γ | |
Pd/ZrO2(500) | - | 311(62) | 332 (38) | 277 (24) | 297 (49) | 316 (27) |
Pd/ZrO2(600) | - | 313 (62) | 332 (38) | 274 (35) | 293 (50) | 314 (15) |
Pd/ZrO2(700) | - | 321 (60) | 337 (40) | 271 (36) | 289(47) | 307 (17) |
Pd/ZrO2(800) | - | 342 (60) | 356 (40) | 274 (34) | 294 (50) | 308 (16) |
Pd/ZrO2(900) | - | 357 (34) | 370 (66) | - | 366 (84) | 386 (16) |
Sample | Isothermal Reaction at 400 °C (Dry Conditions) | Isothermal Reaction at 450 °C (Wet Conditions) | ||||
---|---|---|---|---|---|---|
Xinit a (%) | X15h b (%) | Rd c (%/h) | Xinit a (%) | X15h b (%) | Rd c (%/h) | |
Pd/ZrO2(500) | 76.7 | 75.5 | 0.10 | 75.9 | 70.5 | 0.47 |
Pd/ZrO2(600) | 78.8 | 77.3 | 0.13 | 80.8 | 76.0 | 0.40 |
Pd/ZrO2(700) | 97.6 | 97.2 | 0.03 | 89.7 | 84.6 | 0.38 |
Pd/ZrO2(800) | 40.0 | 35.6 | 0.73 | 62.7 | 55.7 | 0.74 |
Pd/ZrO2(900) | 24.8 | 12.4 | 3.33 | 24.0 | 8.2 | 4.39 |
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Kim, C.; Hong, E.; Shin, C.-H. Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment. Catalysts 2019, 9, 838. https://doi.org/10.3390/catal9100838
Kim C, Hong E, Shin C-H. Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment. Catalysts. 2019; 9(10):838. https://doi.org/10.3390/catal9100838
Chicago/Turabian StyleKim, Chansong, Eunpyo Hong, and Chae-Ho Shin. 2019. "Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment" Catalysts 9, no. 10: 838. https://doi.org/10.3390/catal9100838