Abstract
A novel NOx storage and reduction catalyst, namely 1Pt/20Ba/Co1Mg2Al1Ox with dual NOx adsorption sites was developed. The layered double hydroxide derived mixed metal oxide Co1Mg2Al1Ox not only serves as catalyst support but also provides additional NOx adsorption catalytic sites. The influence of Pt and BaO loadings, adsorption and calcination temperatures, H2O resistance and lean-rich cycling conditions on the performance of the stated catalyst composition were systematically investigated. We demonstrate that this new 1Pt/20Ba/Co1Mg2Al1Ox catalyst possesses much higher NOx storage capacity (1.38mmol/g) than the conventional Pt/Ba/γ-Al2O3 (0.56mmol/g). It also exhibits good H2O resistance, stability in lean-rich cycling conditions and a high NOx removal efficiency (ca. 82.2%), thus suggesting a great potential for practical lean-burn deNOx applications.
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