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Selective catalytic reduction (SCR) of NOx with ammonia using metal-exchanged molecular sieves with a chabazite structure has recently been commercialized on diesel vehicles. One of the commercialized catalysts, i.e., Cu-SSZ-13, has received much attention for both practical and fundamental studies. For the latter, the particularly well-defined structure of this zeolite is allowing long-standing issues...
The structural and chemical characteristics of Pt/BaO lean NOx trap (LNT) catalysts supported on γ-Al2O3 and MgAl2O4 are compared in this study. The Pt–BaO/MgAl2O4 sample shows relatively low NOx uptake at temperatures below 300 °C, and the temperature of maximum NOx uptake (Tmax) is shifted to 350 °C in comparison to that of Pt–BaO/Al2O3 (Tmax ~ 250 °C). More importantly, the NOx uptake over the...
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