Abstract
<p class="PaperAbstract"><span lang="EN-US">The catalytic electrochemical reduction of NO with propene was investigated on La<sub>0.85</sub>Sr<sub>0.15</sub>MnO<sub>3+d</sub>/Ce<sub>0.9</sub>Gd<sub>0.1</sub>O<sub>1.95</sub> symmetrical cells. The electrodes were infiltrated with BaO and Pt. The cells were catalytically active towards the selective catalytic reduction of NO<sub>x</sub> with propene, but BaO infiltration lowered the NO conversion, probably because of active-site blocking on La<sub>0.85</sub>Sr<sub>0.15</sub>MnO<sub>3+d</sub>. Pt infiltration enhanced the reduction of NOx with propene. When a voltage was applied to the cell with BaO infiltrated electrodes, the NO conversion increased in absence and presence of propene in the feed gas and presence of 10</span><span lang="EN-US">% O<sub>2</sub>. The addition of propene into the feed gas did not enhance the conversion of NO when the electrodes were infiltrated with BaO. When platinum was co-infiltrated with BaO, the catalytic activity towards the reduction of NO with propene was enhanced. However, almost no effect was observed when a voltage was applied. Additionally, when the cells were infiltrated with Pt, an electrochemical promotion was observed with respect to CO<sub>2</sub> formation.</span></p>
Highlights
Diesel engines exhibit better fuel economy than Otto engines and are becoming more popular
Otto engines run at a stoichiometric fuel/air ratio, whereas diesel engines operate with excess air
The exhaust contains toxic NOx, which for engines running under a stoichiometric fuel/air ratio is efficiently removed by the so-called three-way catalytic converter (TWC)
Summary
Diesel engines exhibit better fuel economy than Otto engines and are becoming more popular. Otto engines run at a stoichiometric fuel/air ratio, whereas diesel engines operate with excess air. The exhaust contains toxic NOx, which for engines running under a stoichiometric fuel/air ratio is efficiently removed by the so-called three-way catalytic converter (TWC). A TWC does not operate in the presence of excess oxygen; NOx removal from a diesel engine is impossible with a TWC [1]. When removing NOx under net oxidizing conditions, selective catalytic reduction (SCR) with ammonia/urea and NOx storage and reduction (NSR) are the most mature technologies.
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