| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 61240 | Journal of Catalysis | 2013 | 9 Pages |
•Photocatalytic partial oxidation of dodecane to OHC at anhydrous condition is studied.•Mixed oxides with <4 nm of TiO2 clusters dispersed on SiO2 matrix is synthesized.•Dilution effect of contiguous TiO2 on the selectivity and yield of OHC is confirmed.•A new deNOx process for diesel engine is proposed.
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 C1–C6 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.
Graphical abstractOn-board photocatalytic partial oxidation of the small amounts of diesel fuel over TiO2–SiO2 mixed oxides produces oxygenated hydrocarbons (mainly C1–C6 aldehydes) as an effective NOx reductant for diesel vehicle exhaust deNOx treatment.Figure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slide
