NDLI: Enhanced Low Temperature NO$_{ x }$ Reduction Performance Over Bimetallic Pt/Rh–BaO Lean NO$

Content Provider	Springer Nature Link
Author	Andova, Stanislava Marchionni, Valentina Lietti, Luca Olsson, Louise
Copyright Year	2013
Abstract	The overall NSR operation was tested over a bimetallic Pt/Rh–BaO lean NO$_{ x }$ trap (LNT) catalyst in the range of 473–673 K with simulated diesel exhausts and compared to monometallic 1 wt% Pt/BaO/γ-Al$_{2}$O$_{3}$ and 0.5 wt% Rh/BaO/γ-Al$_{2}$O$_{3}$ samples. The results showed the beneficial effect of the simultaneous presence of 0.5 wt% Pt and 0.25 wt% Rh on the catalytic performance under lean-burn conditions at low temperatures. It was observed that both Pt/BaO/γ-Al$_{2}$O$_{3}$ and Rh/BaO/γ-Al$_{2}$O$_{3}$, which both were mildly aged, have limited NO$_{ x }$ reduction capacity at 473 K. However, combining Pt and Rh in the NO$_{ x }$ storage catalyst assisted the NO$_{ x }$ reduction process to occur at lower temperatures (473 K). One possible reason could be that the combined Pt and Rh sample was more resistant to aging. In addition, the NO$_{2}$-TPD data showed that the presence of Rh into the Pt/BaO/γ-Al$_{2}$O$_{3}$ system has a considerable effect on the spill-over process of NO$_{ x }$, accelerating the release of NO$_{ x }$ at lower temperatures. These results were in a good agreement with the observed higher rate of oxygen release of the bimetallic Pt/Rh catalyst, leaving a significant number of noble metal sites available for adsorption at lower temperatures than that of the monometallic Pt sample. The superior NSR performance of the bimetallic Pt/Rh/BaO/γ-Al$_{2}$O$_{3}$ catalyst under lean-burn conditions suggested the existence of synergetic promotion effect between the Pt and Rh components, increasing the NO$_{ x }$ reduction efficiency in comparison with that of the monometallic Pt and Rh–BaO LNT catalysts.
Starting Page	68
Ending Page	74
Page Count	7
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	56
Issue Number	1-8
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2013-02-27
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NO$_{ x }$ storage NSR LNT Pt Rh BaO Noble metal TPD Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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