METHOD AND CATALYST FOR PURIFYING EXHAUST GAS
PROBLEM TO BE SOLVED: To keep high capacity within a low temp. region under an air/fuel ratio change condition and to enhance activity within a high temp. region. SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd...
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| creator | SAIKI MOTOHISA SHINJO HIROBUMI |
| description | PROBLEM TO BE SOLVED: To keep high capacity within a low temp. region under an air/fuel ratio change condition and to enhance activity within a high temp. region. SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd catalyst containing cerium oxide is arranged to the rear stage thereof and exhaust gas is changed to oxidable gas and reducible gas under a condition satisfying 62 |
| format | Patent |
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SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd catalyst containing cerium oxide is arranged to the rear stage thereof and exhaust gas is changed to oxidable gas and reducible gas under a condition satisfying 62<=R<=1.2 to be brought into contact with the first Pd catalyst and the second Pd catalyst. In the formula R satisies R = excessive redox equivalent (mol)/Pd support total amt. (mol) and the excessive redox equivalent is the time integration value of atmosphere shift from a chemical equivalent point by the fluctuations of oxidizable and reducible gases.</description><edition>6</edition><language>eng</language><subject>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</subject><creationdate>1997</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19970331&DB=EPODOC&CC=JP&NR=H0985055A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19970331&DB=EPODOC&CC=JP&NR=H0985055A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SAIKI MOTOHISA</creatorcontrib><creatorcontrib>SHINJO HIROBUMI</creatorcontrib><title>METHOD AND CATALYST FOR PURIFYING EXHAUST GAS</title><description>PROBLEM TO BE SOLVED: To keep high capacity within a low temp. region under an air/fuel ratio change condition and to enhance activity within a high temp. region. SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd catalyst containing cerium oxide is arranged to the rear stage thereof and exhaust gas is changed to oxidable gas and reducible gas under a condition satisfying 62<=R<=1.2 to be brought into contact with the first Pd catalyst and the second Pd catalyst. In the formula R satisies R = excessive redox equivalent (mol)/Pd support total amt. 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SOLUTION: A first Pd catalyst positively excluding cerium oxide is arranged to the front stage of an exhaust gas passage and a second Pd catalyst containing cerium oxide is arranged to the rear stage thereof and exhaust gas is changed to oxidable gas and reducible gas under a condition satisfying 62<=R<=1.2 to be brought into contact with the first Pd catalyst and the second Pd catalyst. In the formula R satisies R = excessive redox equivalent (mol)/Pd support total amt. (mol) and the excessive redox equivalent is the time integration value of atmosphere shift from a chemical equivalent point by the fluctuations of oxidizable and reducible gases.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | METHOD AND CATALYST FOR PURIFYING EXHAUST GAS |
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