摘要:
An internal combustion engine wherein a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged inside of an engine exhaust passage. At the time of engine operation, the amount of injection of hydrocarbons from the hydrocarbon feed valve (15) is controlled so that an amplitude of change of concentration of hydrocarbons which flow into the exhaust purification catalyst (13) becomes within a predetermined range of amplitude, and the injection period of hydrocarbons from the hydrocarbon feed valve (15) is controlled so that a concentration of hydrocarbons which flow into the exhaust purification catalyst (13) vibrates within a predetermined range of period. The exhaust purification catalyst (13) is formed so that a deposition ability of hydrocarbons to a downstream side part of the exhaust purification catalyst (13) becomes higher than a deposition ability of hydrocarbons to an upstream side part of the exhaust purification catalyst (13).
摘要:
The present invention provides an exhaust gas purifying catalyst that can keep high catalytic performance even being subjected to exhaust gas. The exhaust gas purifying catalyst includes: noble metal particles (7); and supports (3), each support supporting the noble metal particles (7), wherein at least a certain amount of the noble metal particles (7) is provided on an outermost surface of the support (3), or provided within a range of 10 % inside of a diameter of the support (3) from the outermost surface in a direction toward a center of the support.
摘要:
A catalyst assembly 16 for an exhaust gas system 14 for an automotive vehicle includes a housing 28 and a porous support structure 32 having a plurality of channels 34, 36. A plurality of catalyst pellets 50 are disposed within at least some of the channels. A retainer 54 is positioned adjacent to the support structure 32 for retaining the pellets 50 within the channels 34, 36.
摘要:
The invention relates to a method for the oxidation of carbon- and/or hydrocarbon- and/or combustable organic compounds containing liquid or solid particulate contaminants in gas streams, more in particular soot in exhaust gasses of diesel engines, comprising the treatment of said gas streams in a turbulent flow precipitator, of which at least part of the surface shows catalytic activity for non-selective oxidation.
摘要:
An exhaust purification device for a fossil fuelled engine, comprising a series of alternately blocked laminar flow channels (42) defining inlet sections, cross-flow sections, and exit sections. The flow channels have porous (foraminous) walls (45) and a predetermined hydraulic diameter. The device also has a plurality of NO x reacting pellets (55) packing at least certain of the inlet sections of the channels (42); the pellets have a diameter generally approaching the hydraulic diameter and are comprised of at least dolomitic carbonate. The device has a three-way catalyst (i.e., selected Pd, Pt or Rh) coating (56) at least on the walls (45) of the outlet sections.
摘要:
A fluid catalyst reactor (1, 21, 31 or 41) is rotatably provided in an outer casing (10, 22 or 52) having an untreated gas introducing pipe (11, 26 or 53) to receive exhaust from the diesel engine (EG). The reactor is driven by the diesel engine (EG). The reactor is filled with powdery catalyst (7) such as zeolite and catalyst (7) sticks to the inner peripheral wall of a cylindrical porous dispersing plate (2, 23, 42 or 42a) of the reactor with the rotation of the reactor and forms a fluidized layer while fluidized by untreated gas flowing inward in the radial direction from the inside of the outer casing into the reactor. Untreated gas having flowed into the reactor is treated with catalyst (7), passes a cylindrical filter (8, 34, or 48), and is exhausted through an exhaust pipe (6, 29, 35 or 47). Catalyst (7) reduces NOx gas in untreated gas. The fluidized catalyst layer is maintained by a strong centrifugal force acting thereon even though flowing speed of untreated gas into the reactor is high, whereby the flow quantity of untreated gas can be made large with the size of treating device reduced.