期刊
JOURNAL OF CATALYSIS
卷 302, 期 -, 页码 58-66出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.03.003
关键词
Photocatalytic partial oxidation; Oxygenated hydrocarbons; TiO2-SiO2 mixed oxides; NOx reduction; Diesel vehicle
资金
- Hydrogen Energy RD Center
- Korean Centre for Artificial Photosynthesis [NRF-2011-C1AAA0001-2011-0030278]
- Basic Science Research Program [2012-017247]
- Ministry of Education, Science, and Technology of Korea
- Brain Korea 21 Program
- WCU Program [R31-30005]
Photocatalytic partial oxidation of dodecane has been studied as a model reaction of diesel fuel conversion to oxygenated hydrocarbons (OHCs) as an effective nitrogen oxide (NOx) reductant in selective catalytic reduction (SCR) systems. Thus, TiO2-based photocatalysts produced OHCs composed mainly of C-1-C-6 aldehydes under UV irradiation, and TiO2-SiO2 mixed oxide photocatalysts showed higher selectivity and yield to OHCs than pristine TiO2 by diluting contiguous Ti sites and suppressing complete oxidation to CO2. The effects of reaction variables were studied in detail. A novel scheme of NOx after-treatment system for diesel engine exhaust line was proposed involving the new photocatalytic reaction, where on-board photocatalytic partial oxidation of a small amount of diesel fuel produced OHCs that were supplied to the deNOx system as NOx reductant. Although further improvement is needed in the selectivity for OHCs as well as the system operability, the proposed scheme could be a more environment-friendly option than the reduction by urea, currently considered the most promising technology. (c) 2013 Elsevier Inc. All rights reserved.
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