DELIA FLOREA, VENETIA SANDU<br>Experimental Study of Urea SCR Catalyst for Diesel Engine NOx Abatement

DELIA FLOREA, VENETIA SANDU
Experimental Study of Urea SCR Catalyst for Diesel Engine NOx Abatement

Abstract:

This paper comparatively describes the studies conducted and the experiments performed on CuZSM5-urea-SCR systems, with a view to lowering NOx emissions of heavy-duty commercial diesel engines. The innovative outcome of this research is the finding of a relevant indicator for NOx conversion, depending on the operation modes of the vehicles; this indicator, denominated weighted exhaust gas temperature (WET), predicts NOx conversion in the SCR catalyst. A copper ion-exchanged ZSM5 zeolite was prepared, using an aqueous solution of Cu(CH3COO)2 which was deposed on a metallic support of the urea-SCR system. The SCR treatment applied to the exhaust gas emitted by 4-litre heavy-duty diesel engines experimentally revealed a NOx reduction of 70%, at constant engine speeds and increasing loads, and of and 58.3%, in European Stationary Cycle. Following thorough analysis of the previous research on controlled feed gas reactors and diesel engines, with focus on the differences between NOx conversions in terms of exhaust gas temperature, space velocity, water content, oxygen content, fuel sulphur content, an indicator of NOx conversion was proposed, based on the average temperature of the emission test cycle. A practical result of the research work consisted in the compliance of NOx emission from the tested diesel engine with the standard Euro IV. Key words: Diesel engine emissions, NOx conversion, Selective Catalytic Reduction

Issue: 2014, Volume 65, Issue 9

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