A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Third Report) - High NOx Reduction Efficiency Mechanism at Transient Low Exhaust Gas Temperature Operation -

Yutaka Murata; Sadahito Tokui; Ryo Komiya; Atsushi Kaneko; Yasuhiro Daisho; Hisakazu Suzuki; Hajime Ishii

doi:10.11351/jsaereview.31.103

Other engineering

A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Third Report)

- High NOx Reduction Efficiency Mechanism at Transient Low Exhaust Gas Temperature Operation -

Yutaka Murata, Sadahito Tokui, Ryo Komiya, Atsushi Kaneko, Yasuhiro Daisho, Hisakazu Suzuki, Hajime Ishii

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Keywords: Diesel Engine, Emission, Catalyst, Urea SCR, NO, NO₂, Fast SCR, Ammonium Nitrate(NH₄NO₃)

JOURNAL RESTRICTED ACCESS

2010 Volume 31 Issue 1 Pages 103-110

DOI https://doi.org/10.11351/jsaereview.31.103

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Abstract

NOx reduction mechanism and requirements for high NOx reduction efficiency in a urea SCR system at transient conditions with low exhaust gas temperature were investigated by using a four liters multi-cylinder diesel engine. NOx can be significantly reduced by adjusting mode-overall SCR inlet NO₂/NOx ratio at 0.5±0.1 while adopting NH₃ adsorption quantity control. It has been shown that ammonium nitrate (NH₄NO₃) plays an important role in enhancing the Fast SCR reaction at transient low exhaust gas temperature conditions.

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