A combined experimental and modeling study was carried out to investigate the effects of Pt:Pd ratio on the performance of diesel oxidation catalysts (DOC) for heavy-duty applications 1 (PGM<50 g/ft 2x). In the first part of this work, transient light-off and steady-state experiments were performed over a series of hydrothermally aged DOCs with different Pt:Pd ratios and PGM loadings. It was found that n -decane and NO oxidation activities increased monotonically as the Pt:Pd ratio was increased while the oxidation of unsaturated hydrocarbons (HC) (C 3 H 6 and C 7 H 8 ) first increased with an increase in Pt:Pd ratio and then plateaued at higher Pt content. In contrast, the CO oxidation exhibited opposite trend, with the catalyst containing low Pt (high Pd) level being more active. The presence of HC lowered the outlet NO 2 /NOx ratio by reducing the NO 2 generated via NO oxidation back to NO. The negative effect of HCs on NO 2 /NOx ratio increased in the order: C 3 H 6
| SAE International | |
|---|---|
| Product Category | Standards and Technical Documents |
| Product Number | 2015-01-1052 |
| Product Name | The Effect of Pt:Pd Ratio on Heavy-Duty Diesel Oxidation Catalyst Performance: An Experimental and Modeling Study |
