NDLI: Promotional Effects of H2O Treatment on NO x Storage Over Fresh and Thermally Aged Pt

Content Provider	Springer Nature Link
Author	Kim, Do Heui Chin, Ya Huei Kwak, Ja Hun Peden, Charles H. F.
Copyright Year	2008
Abstract	A simple liquid water treatment applied to fresh and thermally aged Pt(2 wt%)–BaO(20 wt%)/Al2O3 lean NO x trap catalysts at room temperature induces morphological and structural changes in the barium species as followed by XRD and TEM analysis. During the water treatment, liquid water sufficient to fill the catalyst pore volume is brought into contact with the samples. It was found that irrespective of the original barium chemical state (highly dispersed BaO or crystalline BaAl2O4), exposing the sample to this liquid water treatment promotes the formation of BaCO3 crystallites (about 15–25 nm of its size) without changing the Pt particle size. Such transformations of the barium species are found to significantly promote NO x uptake from 250 to 450 °C. The increase in the NO x uptake for the water-treated samples can be attributed to an enhanced Pt–Ba interaction through the redistribution of barium species. These results provide useful information for the regeneration of aged lean NO x trap catalysts since water is plentiful in the exhaust of diesel or lean-burn engines.
Starting Page	39
Ending Page	45
Page Count	7
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	124
Issue Number	1-2
e-ISSN	1572879X
Language	English
Publisher	Springer US
Publisher Date	2008-05-17
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pt–BaO/Al2O3 Lean NO x trap catalyst Water treatment BaAl2O4 Pharmacy Industrial Chemistry/Chemical Engineering Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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