首页|Synergetic promotion of 4Mn10Ce/gamma-Al2O3 catalyst to Pt/xBa/Ce0.5Zr0.5O2 catalysts for NOx removal from diesel exhausts
Synergetic promotion of 4Mn10Ce/gamma-Al2O3 catalyst to Pt/xBa/Ce0.5Zr0.5O2 catalysts for NOx removal from diesel exhausts
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NSTL
Elsevier
In this investigation, Pt/xBa/Ce0.5Zr0.5O2 catalysts were prepared by deposition and incipient wetness impregnation method and the physio-chemical properties of samples were characterized with XRD and BET. The experiments were carried out to evaluate the effect of 4Mn10Ce/gamma-Al2O3 on the removal of NOx over the Pt/xBa/ Ce0.5Zr0.5O2 catalysts and NO-TPD was employed for determining the NOx adsorption. The results showed that the larger diffraction peak width of Ce-Zr oxides and specific area were found over Pt/15Ba/Ce0.5Zr0.5O2. Based on the NOx storage and storage-reduction experiments, it was found that the decline of NOx storage efficiency was attributed to the decomposition of nitrites and nitrates under high temperatures beyond 350 degrees C, and the inhibition of reactions of NOx with Ba by the NO oxidation. NO2 was stored more easily and faster than NO, which contributed to NOx storage after 4Mn10Ce/gamma-Al2O3 catalyst added. The stability of stored species was undermined at higher temperature due to H-2 consumption by 4Mn10Ce/gamma-Al2O3 catalyst leading to shortage of reductant and more reaction heat. The optimal concentration of O-2 at around 7.5% can provide more O-II for the oxidation process of NO and improve the performance of NOx reduction.
NSTL
Elsevier
