The LNT technology has a simple system, small footprint, and convenient maintenance, making it the most promising NOx emission control technology for lean burn gasoline vehicles. However, its conversion activity is significantly affected by the post-treatment reaction scenario. It is of great significance to conduct research on the effects of lean/rich cycle, frequency, air fuel ratio, airspeed, and temperature on the conversion performance of LNT catalysts. Our team's research shows that with the extension of t (lean) and the shortening of t (rich), the NOx activity temperature window of the catalyst shows a narrowing trend, while CO shows a widening trend, while C3H6 is basically unaffected; Under the condition of lean/rich periodic fluctuations, the NOx activity temperature window of the catalyst is mainly located in the range of 350~450 ℃; λ The increase in lean does not have a significant impact on the NOx and CO activity temperature windows of the catalyst, but λ With the decrease of (rich), the NOx activity temperature window of the catalyst shows a significant broadening trend, while CO shows a narrowing trend; As the airspeed (exhaust flow rate) increases, the conversion activity temperature window of each gaseous pollutant gradually narrows.
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