Selective Catalytic Reduction of NOx from Diesel Exhaust Gas.
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概要
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The efficiency of TiO<SUB>2</SUB>-V<SUB>2</SUB>O<SUB>5</SUB> catalyst for selective catalytic reduction (SCR) of NO<SUB>x</SUB> was investigated using a single-cylinder direct-injection diesel engine. Ammonium carbonate solution and urea solution were mixed with exhaust gas as deoxidizer instead of NH<SUB>3</SUB> gas injection. The catalyst provided a substantial reduction in NO<SUB>x</SUB> emissions for a catalyst bed temperature of about 190-430°C. NO<SUB>x</SUB> removal rate was about 70-95% for a space velocity of 6300-12500 h<SUP>-1</SUP>, catalyst temperature of : 350-400°C and NH3 molar ratio of 1-2. Reaction at temperatures above 400°C induced combustion of NH<SUB>3</SUB> and catalyst sintering. It was recommended that the urea solution be used as deoxidizer in practical application to achieve high denitration efficiency and low leakage of NH<SUB>3</SUB>. However, injection of urea solution caused an increase of Bosch smoke pollution and a reduction of SO<SUB>2</SUB> concentration due to the emission of sulfate dust produced by reaction of leakage NH<SUB>3</SUB> with SO<SUB>2</SUB> and particulate matter (PM). The PM contained a relatively large amount of Na<SUP>+</SUP>, K<SUP>+</SUP> and SO<SUB>4</SUB><SUP>--</SUP>, which contribute to deterioration of catalyst efficiency, and therefore the PM had a significant effect on the catalyst activity.
- 一般社団法人 日本機械学会の論文
一般社団法人 日本機械学会 | 論文
- PREFACE
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