HYDROCARBON ADSORPTIVE CATALYST

PURPOSE:To provide a hydrocarbon adsorptive catalyst which is applicable to purify hydrocarbons in the temperature range from the low temperature of exhaust gas at the time of engine start to the temperature at which the catalyst can show the hydrocarbon purifying function well. CONSTITUTION:A hydro...

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Bibliographic Details
Main Authors HAYASHI CHIEMI, IKEDA TAKUYA, ITO TETSUO, MASUDA GOJI
Format Patent
LanguageEnglish
Published 24.05.1994
Edition5
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:PURPOSE:To provide a hydrocarbon adsorptive catalyst which is applicable to purify hydrocarbons in the temperature range from the low temperature of exhaust gas at the time of engine start to the temperature at which the catalyst can show the hydrocarbon purifying function well. CONSTITUTION:A hydrocarbon adsorptive catalyst is provided with a first layer of ZSM-5 zeolite ion-exchanged with at least one metal of Cu and Pd, which are effective for hydrocarbon adsorption, on a monolithic carrier, a second layer of a powder of mainly activated ceria and/or alumina containing Pt and/or Pd as a catalytic component on the first layer, and a third layer containing Rh as a catalytic component on the second layer.
Bibliography:Application Number: JP19920298934