Combination of photocatalysis and HC/SCR for improved activity and durability of DeNOx catalysts
SCIE
SCOPUS
- Title
- Combination of photocatalysis and HC/SCR for improved activity and durability of DeNOx catalysts
- Authors
- Heo, I; Kim, MK; Sung, S; Nam, IS; Cho, BK; Olson, KL; Li, W
- Date Issued
- 2013-04-16
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A photocatalytic HC/SCR system has been developed and its high deNOx performance (54.0-98.6% NOx conversion) at low temperatures (150-250 degrees C) demonstrated by using a representative diesel fuel hydrocarbon (dodecane) as the reductant over a hybrid SCR system of a photocatalytic reactor (PCR) and a dual-bed HC/SCR reactor. The PCR generates highly active oxidants such as O-3 and NO2 from O-2 and NO in the feed stream, followed by the subsequent formation of highly efficient reductants such as oxygenated hydrocarbon (OHC), NH3, and organo-nitrogen compounds. These reductants are the key components for enhancing the low temperature deNOx performance of the dual-bed HC/SCR system containing Ag/Al2O3 and CuCoY in the front and rear bed of the reactor, respectively. The OHCs are particularly effective for both NOx reduction and NH3 formation over the Ag/Al2O3 catalyst, while NH3 and organo-nitrogen compounds are effective for NOx reduction over the CuCoY catalyst. The hybrid HC/SCR system assisted by photocatalysis has shown an overall deNOx performance comparable to that of the NH3/SCR, demonstrating its potential as a promising alternative to the current urea/SCR and LNT technologies. Superior durability of HC/SCR catalysts against coking by HCs has also been demonstrated by a PCR-assisted regeneration scheme for deactivating catalysts.
- Keywords
- SIMULATED DIESEL EXHAUST; NOX REDUCTION; SELECTIVE REDUCTION; HIGHER HYDROCARBONS; ZEOLITE CATALYST; HC-SCR; AG/AL2O3; MECHANISM; SILVER; OXIDATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14918
- DOI
- 10.1021/ES304188K
- ISSN
- 0013-936X
- Article Type
- Article
- Citation
- Environmental Science and Technology, vol. 47, no. 8, page. 3657 - 3664, 2013-04-16
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