摘要:
An exhaust purification device of an engine providing a NO x absorbent arranged in the exhaust passage. An O 2 sensor generating a current proportional to the air-fuel ratio is arranged in the engine exhaust passage downstream of the NO x absorbent. The amount of NO x actually absorbed in the NO x absorbent at the time of release of the NO x is calculated on the basis of the output signal of this O 2 sensor. On the basis of this calculated amount of NO x , correction is made so that the estimated amount of NO x represents the actual amount of absorption of NO x . When this corrected estimated amount of NO x reaches a set value, the action of releasing the NO x from the NO x absorbent is carried out.
摘要:
To provide a particulate matter purifying device which is capable of providing excessive deposition pf particulate matter. In the particulate matter purifying device, a catalyst element 11 is carried on a porous filter substrate 10 through which an exhaust gas passes. The particulate matter purifying device traps particulate matter contained in the exhaust gas, and oxidizing the trapped particulate matter to remove. This particulate matter purifying device is characterized in that active oxygen producing fine particles 12 are carried on a surface of the filter substrate 10 between the catalyst elements 11. Therefore, the particulate matter is partially damaged by the active oxygen produced by the active oxygen producing fine particles 12. Consequently, oxidization of the particulate matter is promoted so that deposition of the particulate matter is prevented or minimized.
摘要:
An exhaust purification catalyst for a compression ignition engine comprises a carrier substrate and a metal-carrying layer which carries catalytic metal formed on the surface of the carrier substrate, and is characterized in that a diffusion restriction layer (14) having a predetermined thickness which portion extends from the surface of said diffusion restriction layer (14) opposite to said metal-carrying layer (12) into said diffusion restriction layer (14) and forms a thermal deterioration restriction layer (18) additionally having thermal resistance.
摘要:
A device for detecting deterioration of a NOx absorbent arranged in the exhaust passage of an engine. An O2 sensor generating a current proportional to the air-fuel ratio is arranged in the exhaust passage downstream of the NOx absorbent. When the amount of NOx absorbed in the NOx absorbent is almost zero or after the amount of NOx absorbed in the NOx absorbent is made almost zero, the air-fuel ratio of the air-fuel mixture is changed from lean to rich, and the amount of oxygen stored in the NOx absorbent is detected from the output signal of the O2 sensor at this time. Further, the NOx absorbing capability is found by using this detected oxygen amount.
摘要:
A method for purifying an exhaust gas containing an excess amount of oxygen is described, wherein a catalyst is brought into contact with the exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from the exhaust gas, said catalyst comprises:
(i) a zeolite having a molar ratio of SiO₂/Al₂O₃ of at least 10; and (ii) at least one copper ion and at least one kind of rare earth ion loaded thereon.
摘要翻译:描述了一种净化含有过量氧气的废气的方法,其中使催化剂与废气接触以从废气中除去氮氧化物,一氧化碳和烃,所述催化剂包括:(i)沸石 SiO 2 / Al 2 O 3的摩尔比至少为10; 和(ii)负载有至少一种铜离子和至少一种稀土离子。