Low temperature NOx removal from diesel exhaust by coupling ethylene glycol reforming with SCR
✍ Scribed by Hiu-Ying Law; Mayfair C. Kung; Harold H. Kung
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 311 KB
- Volume
- 136
- Category
- Article
- ISSN
- 0920-5861
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✦ Synopsis
The reduction of NO x at 185 8C on Pd supported on Ti-pillared clay was studied using H 2 and CO generated by reforming of ethylene glycol (EG) over a Na-Pt/g-Al 2 O 3 catalyst. It was found that for a stream containing 490 ppm NO, 5.8% O 2 , and 2.9% H 2 O, at a space velocity of $24,000 h À1 , a stable NO x conversion of $55% was obtained when a stream of 1.36% EG was reformed under a condition that the EG conversion was complete and sufficient H 2 and CO was produced. However, if the EG conversion was incomplete, the unreacted EG deactivated the deNO x catalyst, possibly by coking, that could not be regenerated by O 2 treatment at reaction temperature. H 2 O suppressed the deNO x activity, but the effect was reversible and the activity could be recovered after removal of H 2 O. The deNO x activity was found to be higher on catalysts containing more highly dispersed Pd.