N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites
Abstract
:1. Introduction
2. Results and Discussion
2.1. Effect of Activation Conditions on Formation of Active Sites
2.2. N2O Adsorption
2.3. Degradation of Active Sites during High Temperature Treatment
3. Materials and Methods
3.1. Catalyst Preparation and Activation
3.2. Catalyst Characterization
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Sample Availability: Samples of the compounds are available from the authors. |
Catalyst | Fe (ppm) | Si/Al | Site Concentration (1018 Sites gcatalyst−1) | ||
---|---|---|---|---|---|
CN2 | CCO2 | CO,TPD | |||
HZSM-51200Fe | 1200 | 120 | 3.5 | 3.2 | 3.1 |
HZSM-52300Fe | 2300 | 42 | 10.2 | 8.8 | 8.4 |
Atmosphere | Activation Temperature (K) | Final Isothermal Hold Time (min) | Site Concentration (1018 Sites gcatalyst−1) | ||||||
---|---|---|---|---|---|---|---|---|---|
CN2 | CCO2 | % a | CO, TPD | % b | CNO, TPD | % c | |||
100% v/v He | 973 | 1 | 4.4 | 2.4 | 55 | 1.8 | 40 | 0.04 | 1 |
15 | 5.0 | 3.1 | 61 | 2.6 | 51 | 0.17 | 3 | ||
100% v/v He | 1273 | 1 | 10.3 | 8.5 | 83 | 8.9 | 87 | 0.29 | 3 |
15 | 10.7 | 9.4 | 88 | 9.5 | 89 | 0.31 | 3 | ||
2% v/v O2/He | 1273 | 1 | 8.2 | 7.2 | 88 | 7.1 | 87 | 0.20 | 2 |
15 | 7.4 | 6.4 | 86 | 6.2 | 83 | 0.18 | 2 |
Atmosphere | Activation Temperature (K)/Final Isothermal Hold (min) | C[O] (1018 Sites gcatalyst−1) | |
---|---|---|---|
CN2-CCO2 | CN2-CO,TPD | ||
100% v/v He | 973/15 | 1.9 | 2.5 |
100% v/v He | 1273/15 | 1.3 | 1.3 |
2% v/v O2/He | 1273/15 | 1.1 | 1.2 |
Activation Temperature (K) a/Final Isothermal Hold Time (min) | Site Concentration (1018 Sites gcatalyst−1) | C[O] (1018 Sites gcatalyst−1) | |||||
---|---|---|---|---|---|---|---|
CN2 | CCO2 | % b | CO,TPD | % c | CN2-CCO2 | CN2-CO,TPD | |
673/60 | 1.3 | 0.1 | 8 | 0 | 0 | 1.2 | 1.3 |
773/60 | 1.9 | 0.4 | 21 | 0.2 | 11 | 1.5 | 1.7 |
Final Isothermal Hold Time (min) a | N2O Adsorbed (1018 Sites gcatalyst−1) |
---|---|
120 | 0 |
30 | 0.61 |
15 | 1.47 |
1 | 0.47 |
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Bromley, B.; Pischetola, C.; Nikoshvili, L.; Cárdenas-Lizana, F.; Kiwi-Minsker, L. N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites. Molecules 2020, 25, 3867. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules25173867
Bromley B, Pischetola C, Nikoshvili L, Cárdenas-Lizana F, Kiwi-Minsker L. N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites. Molecules. 2020; 25(17):3867. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules25173867
Chicago/Turabian StyleBromley, Bryan, Chiara Pischetola, Linda Nikoshvili, Fernando Cárdenas-Lizana, and Lioubov Kiwi-Minsker. 2020. "N2O Decomposition over Fe-ZSM-5: A Systematic Study in the Generation of Active Sites" Molecules 25, no. 17: 3867. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules25173867