| 摘要 |
PROBLEM TO BE SOLVED: To increase the rate of reduction in a low temperature region of nitrogen oxides contained in exhaust gas. SOLUTION: This catalyst for purifying exhaust gas in which zeolite (for example, H-ZSM-5) particles and noble metal (for example, Pt, Pd, Rh, Ir, Ag, and Au) particles are mixed so that the content of the zeolite particles is 90-99.5wt.% can be produced by a method in which a carbon powder is added into the aqueous solution of the noble metal so that the content of the metal is 0.5-10wt.% of the carbon powder, after the obtained solution being heated to evaporate water, the residue is subjected to hydrogen heating reduction treatment, the noble metal is deposited on the carbon particles, zeolite particles, water, and an inorganic binder are added to the deposit, the mixture is agitated sufficiently to form a slurry, the slurry is applied on a substrate, dried, and burned to remove the carbon particles, and the zeolite particles and the noble metal particles are dried and supported on the substrate (for example, a honeycomb body of cordierite). |
