The effects of support material and noble metal on the catalytic oxidation of diesel exhaust gases

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:142016

Maunula, T I; Harkonen, M A; Kivioja, M I; Slotte, T O.B.; Oy, K ^[1]

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1. Oulu Research Centre (Finland)

The catalytic oxidation of harmful CO and hydrocarbons on Al{sub 2}O{sub 3}-, SiO{sub 2}- and TiO{sub 2}- supported Pt, Pd, and Rh catalysts has been investigated in the presence of excess oxygen. The effects of noble metals and washcoat modifications on the SO{sub 2} deactivation has been measured in the laboratory tests. The sulfur storage and SO{sub 2} oxidation to SO{sub 3} on different washcoats have been demonstrated with thermodynamic calculations, storage and activity tests with Pt, Pd, Pt-Pd, and Pt-Rh as active metals. The catalytic reaction of NO to NO{sub 2} and other nitrogen compounds depended on noble metal, washcoat, and their interaction. The catalytically inert Al{sub 2}O{sub 3} stores sulfur, but inert SiO{sub 2} and active TiO {sub 2} were resistant to sulfur contamination.

• OSTI ID: 142016
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
DIESEL ENGINES
EXHAUST GASES
OXIDATION
PLATINUM METALS
SILICON OXIDES
TITANIUM OXIDES