EXHAUST GAS PURIFICATION UNDERFLOOR CATALYST AND CATALYST SYSTEM

An exhaust gas purification underfloor catalyst characterized in comprising a catalyst layer having a lower layer and an upper layer, the lower layer containing alumina and CeO 2 , the noble metal content of the lower layer being at most 0.5 mass% in relation to the mass of the lower layer, the uppe...

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Bibliographic Details
Main Authors SATO, Noboru, MURAWAKI, Keisuke, HOSHINO, Sho
Format Patent
LanguageEnglish
French
German
Published 16.10.2019
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:An exhaust gas purification underfloor catalyst characterized in comprising a catalyst layer having a lower layer and an upper layer, the lower layer containing alumina and CeO 2 , the noble metal content of the lower layer being at most 0.5 mass% in relation to the mass of the lower layer, the upper layer containing Rh, alumina, and CeO 2 , the amount of noble metals other than Rh contained being 1 mol% or less in relation to the total amount of noble metals contained in the upper layer, the total amount of CeO 2 contained in the lower layer and the upper layer being 14 g/L to 30 g/L, the amount of CeO 2 contained in the upper layer being 7 g/L to 25 g/L, and the amount of CeO 2 contained in the lower layer being 20% or more of the amount of CeO 2 contained in the upper layer.
Bibliography:Application Number: EP20170763025