Insights into the mechanisms of NH3 inhibition on Cu-CHA SCR catalysts
Dhruba J Deka, Mingyu Wan, Garam Lee, Eric Walter, Fanglin Che, Kenneth G Rappe, János Szanyi, Yong Wang · 2026
Read Insights into the mechanisms of NH3 inhibition on Cu-CHA SCR catalysts by Dhruba J Deka, Mingyu Wan, Garam Lee, Eric Walter, Fanglin Che, Kenneth G Rappe, János Szanyi, Yong Wang (2026) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/PMC13408143.txt.
Description
Dhruba J. Deka and co-authors pinpoint, in 2026, why too much ammonia chokes the catalysts that scrub diesel exhaust. Copper-loaded chabazite catalysts convert nitrogen oxides using ammonia, but excess ammonia suppresses the reaction at low temperatures. Kinetic tests plus live magnetic-resonance spectroscopy and computation located the blockage. It sat in one half of the chemical cycle.
Ammonia coordination raises the energy barrier for copper ions to wander. That movement is required to assemble the reactive copper-oxygen pairs that run the oxidation half-cycle. The reduction half-cycle proceeds nearly unaffected. Inhibition strength shifted with temperature and copper loading, as the mechanism predicts. Smarter catalyst design and operating windows that respect copper mobility are the practical upshot for emission control.
Catalog record
| CREATOR | Dhruba J Deka, Mingyu Wan, Garam Lee, Eric Walter, Fanglin Che, Kenneth G Rappe, János Szanyi, Yong Wang |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 57 KB |
| LICENSE | https://creativecommons.org/licenses/by/4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |