BASE METAL EXHAUST GAS PURIFYING CATALYST, METHOD FOR PRODUCING CARRIER, METHOD FOR PRODUCING CATALYST, AND EXHAUST EMISSION CONTROL DEVICE

BASE METAL EXHAUST GAS PURIFYING CATALYST, METHOD FOR PRODUCING CARRIER, METHOD FOR PRODUCING CATALYST, AND EXHAUST EMISSION CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide an NOx purifying catalyst that uses base metal as catalyst metal and has purifying capacity at a low temperature (250°C or lower) and at a high temperature (500°C or higher), a method for producing a carrier, a method for producing a catalyst, and an exhaust emission...

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Bibliographische Detailangaben
Hauptverfasser: WATABE GAO, MORIKAWA AKIRA, TAKAGI SHIGEJI, HIROSE TAKUTO
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
STEAM ENGINES
THEIR RELEVANT APPARATUS
TRANSPORTING
WEAPONS
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide an NOx purifying catalyst that uses base metal as catalyst metal and has purifying capacity at a low temperature (250°C or lower) and at a high temperature (500°C or higher), a method for producing a carrier, a method for producing a catalyst, and an exhaust emission control device.SOLUTION: The exhaust gas purifying catalyst includes base metal nanoparticles dispersedly carried on a powdery carrier. The carrier contains at least ceria particles and zirconia particles, and the particle diameter of the ceria particles is smaller than that of the zirconia particles. It is preferable that the particle diameter of the ceria particles is 1-9 nm, that the percentage of the ceria particles to the zirconia particles is 5-30 wt.% and that the particle diameter of the zirconia particles is 5-50 nm.