The effect of lean NOx trap catalyst on NO2 removal from diesel engine

Shafizal , Mat (2007) The effect of lean NOx trap catalyst on NO2 removal from diesel engine. Masters thesis, Coventry University.

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The research work described in this dissertation aims to investigate the LNT catalyst performance in real exhaust environment, especially to study the NOx reduction from the diesel engine. The main experimental techniques used in this study were observation and measurement of the emission traces, using an emissions analyser. An engine test rig based on 4-cylinder 2.0L light duty diesel engine and exhaust after treatment device system containing of a flow straightener, a oxidation catalyst and LNT catalyst have been developed and used for this study. The experimental study began with the measurement of emissions using the LNT catalyst substrate at different speed loadings (I 000, 2000, 3000 and 4000 rpm). It showed that high temperatures in the catalyst substrate influenced the reduction of CO and NOx concentration. The percentages of CO and NOx reduction were measured and calculated to be 5 - 27% at different speed loadings. Computational study was performed to investigate the flow visualisation, laminar and turbulent behaviours and pressure distributions in the catalyst bed. A large turbulent vortex or separation occurred at the inlet diffuser wall and nonuniformity flows along the outlet wall. Flow in catalyst substrate channels is laminar due to the small Reynolds number in the narrow channels. A study on the pressure distributions in the catalyst bed showed that highest pressures occurred around the catalyst substrate's entrance at the centre point. The study also presents contour of pressure distributions from the inlet to outlet of the catalyst bed. Computational analysis for each operating conditions were calculated using CFD-Fluent and the results were used to validate the experimental measurements. From the calculation, it showed that both experimental and computational studies are comparable for this research.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Natural gas vehicles, Nitrogen oxides, Catalysis
Subjects: T Technology > T Technology (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Library > Tesis > FKM
Depositing User: Mohd. Nazir Taib
Date Deposited: 30 Nov 2015 02:45
Last Modified: 30 Nov 2015 02:45
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