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采用分步等体积浸渍法制备了Pd/Mn/Ba/Al系列催化剂,并用DR IFTS、TPD、TPSR等方法进行了表征,考察了催化剂在不同温度点NOx的存储量以及存储-还原循环中NOx的脱除率.结果表明,NO更容易在MNOx上形成亚硝酸盐,Mn的加入显著提高了Pd/Ba/Al的低温存储活性,与Pd/Ba/Al相比,Pd/Mn/Ba/Al在30℃、100℃、200℃、300℃的存储量分别提高了87%、59%、32%、91%,循环实验表明,在200℃和300℃时,NOx的脱除率分别提高了5%和37%,而在400℃的NOx脱除率稍有降低.
The Pd / Mn / Ba / Al catalysts were prepared by the step-and-volume impregnation method. The catalysts were characterized by DR IFTS, TPD and TPSR. The effects of catalyst on the storage of NOx and NOx in the storage- The results showed that nitrite was more easily formed on MNOx by NO. The addition of Mn significantly enhanced the low-temperature storage activity of Pd / Ba / Al. Compared with Pd / Ba / Al, Pd / Mn / Ba / The storage capacities of Al increased by 87%, 59%, 32% and 91% respectively at 30 ℃, 100 ℃, 200 ℃ and 300 ℃. The cycling experiments showed that the removal rates of NOx increased respectively at 200 ℃ and 300 ℃ 5% and 37% respectively, while the NOx removal rate slightly decreased at 400 ° C.