Abstract
The efficiency of TiO2-V2O5 catalyst for selective catalytic reduction (SCR) of NOx 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 NH3 gas injection. The catalyst provided a substantial reduction in NOx emissions for a catalyst bed temperature of about 190-430°C. NOx removal rate was about 70-95% for a space velocity of 6300-12500 h-1, catalyst temperature of : 350-400°C and NH3 molar ratio of 1-2. Reaction at temperatures above 400°C induced combustion of NH3 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 NH3. However, injection of urea solution caused an increase of Bosch smoke pollution and a reduction of SO2 concentration due to the emission of sulfate dust produced by reaction of leakage NH3 with SO2 and particulate matter (PM). The PM contained a relatively large amount of Na+, K+ and SO4--, which contribute to deterioration of catalyst efficiency, and therefore the PM had a significant effect on the catalyst activity.
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