Catalytic diesel engine emission control; oxidation of NO to NO{sub 2} in the presence of SO{sub 2} over Pt/ZrO{sub 2} and Pt/ZrO{sub 2}-SO{sub 2} catalysts
- Univ. of Twente, Enschede (Netherlands)
One possible alternative to reduce the soot emission from a diesel engine is to oxidize soot in situ by NO{sub 2}-NO{sub 2} could be obtained by catalytic oxidation of the NO present in the diesel exhaust. Application of this method depends very much on the development of suitable catalysts which could selectively catalyze the oxidation of NO to NO{sub 2} but not SO{sub 2} to SO{sub 3}. The SO{sub 2} present in the diesel exhaust, if oxidized to SO{sub 3}, would bring a negative effect on the removal of soot by forming sulfates which deposit on the soot. The aim of the present study is to understand the influence of the acidity of the support on the selectivity for NO oxidation over SO{sub 2}. Sulphated ZeO{sub 2}, which is known to be a super acid, has been chosen as a model support in this study, Pt/ZrO{sub 2}-SO{sub 4}, and its sulphate-modified form, Pt/ZrO{sub 2}-SO{sub 4}, have therefore been examined as catalysts for the oxidation of NO to No{sub 2} in the presence of SO{sub 2} under diesel exhaust conditions. The superacidic catalyst, Pt/ZrO{sub 2}-SO{sub 4}, showed an enhancement in the catalytic activities for both the oxidation of NO to NO{sub 2} and of SO{sub 2} to SO{sub 3} in comparison with a Pt/ZrO{sub 2} catalyst.
- OSTI ID:
- 142017
- Report Number(s):
- CONF-930304-; TRN: 93:003688-1707
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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