摘要:
In order to improve a purification of exhaust gas from cold HC, it is provided an exhaust gas purifying method for an internal combustion engine which uses an exhaust gas purifying system comprising a first catalyst, which contains a noble metal and reduces hydrocarbons contained in an exhaust gas, and a second catalyst, which is disposed downstream of the first catalyst and contains β-zeolite, wherein the method comprises the step of discharging the exhaust gas having an oxygen concentration of not less than 4% continuously or intermittently from the internal combustion engine at a time of engine cold start conditions.
摘要:
An exhaust gas purifying system of the present invention comprises a first catalyst which contains a noble metal and reduces hydrocarbons contained in exhaust gas, and a second catalyst which is disposed downstream of the first catalyst and contains β-zeolite. In the exhaust gas purifying system, a mixed gas having an air-fuel ratio of not less than 25 is burned in an internal combustion engine, and the internal combustion engine discharges the exhaust gas having an oxygen concentration of not less than 4% continuously or intermittently.
摘要:
In order to improve a purification of exhaust gas from cold HC, it is provided an exhaust gas purifying method for an internal combustion engine (3) which uses an exhaust gas purifying system comprising a first catalyst (5), which contains a noble metal and reduces hydrocarbons contained in an exhaust gas, and a second catalyst (7), which is disposed downstream of the first catalyst (5) and contains β-zeolite, wherein the method comprises the step of discharging the exhaust gas having an oxygen concentration of not less than 4% continuously or intermittently from the internal combustion engine at a time of engine cold start conditions.
摘要:
A catalyst (5) for selectively oxidizing carbon monoxide, wherein a noble metal (3) and an active oxygen supply material (4) capable of oxidizing carbon monoxide are supported on a substrate (6). Favorable selective oxidation of carbon monoxide can be obtained by setting the distance between the noble metal (3) and the active oxygen supply material (4) such that the noble metal (3) is close enough to accept active oxygen from the active oxygen supply material (4), and preferably within 0.1 mm. This catalyst (5) for selectively oxidizing carbon monoxide is effective at removing carbon monoxide from a reformate gas whose main component is hydrogen and which is supplied to a fuel cell.
摘要:
A catalyst (5) for selectively oxidizing carbon monoxide, wherein a noble metal (3) and an active oxygen supply material (4) capable of oxidizing carbon monoxide are supported on a substrate (6). Favorable selective oxidation of carbon monoxide can be obtained by setting the distance between the noble metal (3) and the active oxygen supply material (4) such that the noble metal (3) is close enough to accept active oxygen from the active oxygen supply material (4), and preferably within 0.1 mm. This catalyst (5) for selectively oxidizing carbon monoxide is effective at removing carbon monoxide from a reformate gas whose main component is hydrogen and which is supplied to a fuel cell.
摘要:
An internal combustion engine (1) comprises a fuel injector (9), a filter (13) which traps particulate matter in exhaust gas, and a catalyst (14) which oxidizes unburnt fuel or carbon monoxide in the exhaust gas on the upstream side of the filter (13). When regeneration of the filter (13) is required, a controller (21) determines a post-injection fuel injection timing and a post-injection fuel injection amount of the fuel injector (9) on the basis of an upstream exhaust gas temperature ( Texh ) and a catalyst temperature ( Tcat ) (S16, S17, S19, S20, S22, S23, S25, S26, S28), thereby optimizing the regeneration temperature condition of the filter (13).