| abstract |
In an exhaust purification catalyst that generates lower hydrocarbons from higher hydrocarbons and reduces nitrogen oxides using the lower hydrocarbons as a reducing agent, the catalyst structure and the like are simplified, and nitrogen oxides are purified. Increase performance as much as possible. The exhaust purification catalyst includes a first catalyst component that reduces nitrogen oxides using lower hydrocarbons, and at least lower hydrocarbons are produced from higher hydrocarbons in the active temperature range of the first catalyst components. It is assumed that the second catalyst component to be contained is contained in a dispersed state. As a result, while the catalyst structure is simplified by using one catalyst form, when the catalyst is used, a higher hydrocarbon is supplied to the exhaust system so that the second catalyst component has the second hydrocarbon component. to produce a lower hydrocarbon, the lower hydrocarbons, in order to use as a reducing agent for the NO x purification, supplied to the first catalyst component. [Selection] Figure 1 |