Platinum group metal capture materials
AssigneeBASF SE
InventorsXinyi WEI, Gerard Diomede LAPADULA, Kevin BEARD, Weiyong TANG, Jian LI
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Abstract
Disclosed herein are platinum group metal capture materials comprising an alkaline earth metal oxide. Also disclosed herein are catalytic articles, exhaust gas treatment systems, and methods of treating an exhaust gas comprising the same. Some embodiments of the present disclosure relate to gas treatment systems comprising a means for oxidizing carbon monoxide and oxidizing hydrocarbons, a means for capturing a volatilized platinum group metal, and a means for selectively reducing nitrogen oxides.
Claims14
A platinum group metal capture material comprising an alkaline earth metal oxide, wherein the platinum group metal capture material comprises less than 0.01 weight % of ceria, gold, palladium, silver, platinum, and copper by total weight of the platinum group metal capture material.
An exhaust gas treatment system comprising:
- a means for oxidizing carbon monoxide and oxidizing hydrocarbons,
- a means for capturing a volatilized platinum group metal, and
- a means for selectively reducing nitrogen oxides;
- wherein:
- the means for oxidizing carbon monoxide and oxidizing hydrocarbons comprises a platinum group metal,
- the means for capturing a volatilized platinum group metal comprises magnesium oxide,
- the means for capturing a volatilized platinum group metal does not comprise a transition metal except, optionally, zirconium,
- the means for capturing a volatilized platinum group metal does not comprise a rare earth metal,
- the means for capturing a volatilized platinum group metal is located downstream of the means for oxidizing carbon monoxide and oxidizing hydrocarbons, and
- the means for capturing a volatilized platinum group metal is located upstream of the means for selectively reducing nitrogen oxides.
Dependencies are inferred from the claim text.