摘要:
In an internal combustion engine, inside an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The carrier (50) of the exhaust purification catalyst (13) is formed from a crystallized composite oxide of aluminum and an alkali earth metal. On this carrier (50), precious metal catalysts (51, 52) are carried. The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 second or less, whereby the NO x which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
摘要:
In an internal combustion engine, inside an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The carrier (50) of the exhaust purification catalyst (13) is formed from a crystallized composite oxide of aluminum and an alkali earth metal. On this carrier (50), precious metal catalysts (51, 52) are carried. The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 second or less, whereby the NO x which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
摘要:
In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The exhaust purification catalyst (13) is comprised of a mixture of a first catalyst in which platinum (51) and a basic layer (52) are carried on alumina (50) and a second catalyst in which rhodium (56) is carried on zirconia (55). The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 second or less, whereby the NO x which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
摘要翻译:在内燃机中,配置有发动机排气通路内的烃供给阀(15)和排气净化催化剂(13)。 废气净化催化剂(13)由在氧化铝(50)上载有铂(51)和碱性层(52)的第一催化剂和其中铑(56)载于氧化锆上的第二催化剂的混合物组成 (55)。 流入排气净化催化剂(13)的烃的浓度在200ppm以上的振幅的预定范围内振动,并且在5秒以下的规定范围内,由此,NO x 在废气净化催化剂(13)中减少废气中所含的废气。