LNT技术系统简单、占用空间小、维修方便，是当前最具应用前景的稀燃汽油

LNT technology has a simple system, small space occupation, and easy maintenance. It is currently 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. The lean/rich cycle, frequency, It is of great significance to study the effects of air-fuel ratio, air velocity, and temperature on the conversion performance of LNT catalysts. The research of this team shows that: with the extension of t(lean)/shortening of t(rich), the NOx activity temperature window of the catalyst shows a narrowing trend, and CO shows a widening trend, while C3H6 is basically unaffected; lean/rich fluctuates periodically Under the conditions, the NOx activity temperature window of the catalyst is mainly located in the 350~450℃ region; the increase of λ (lean) has no obvious impact on the NOx and CO activity temperature windows of the catalyst, but the decrease of λ (rich), the NOx of the catalyst The active temperature window shows a clear trend of widening, and CO shows a narrowing trend; as the airspeed (exhaust flow) increases, the transformation active temperature window of each gaseous pollutant gradually narrows.

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.

LNT technology has the advantages of simple system, small occupied space and convenient maintenance. It is the most promising NOx emission control technology for lean-burn gasoline vehicles at present, but its conversion activity is significantly affected by aftertreatment reaction scenarios. It is of great significance to study the effects of lean/rich cycle, frequency, air-fuel ratio, airspeed and temperature on the conversion performance of LNT catalyst. Our team's research shows that with the extension of t(lean)/the shortening of T (rich), the temperature window of NOx activity of the catalyst tends to narrow, and CO tends to widen, while C3H6 is basically unaffected; Under the condition of periodic fluctuation of lean/rich, the temperature window of NOx activity of the catalyst is mainly located in the region of 350~450℃; The increase of λ(lean) has no obvious influence on the temperature window of NOx and CO activity of the catalyst, but the decrease of λ(rich) obviously broadens the temperature window of NOx activity of the catalyst and narrows the temperature window of CO; With the increase of space velocity (exhaust flow), the temperature window of conversion activity of gaseous pollutants gradually narrows.