| abstract |
The invention belongs to the field of diesel vehicle tail gas purification treatment, and particularly discloses three-dimensional ordered macroporous Mn 1‑x Ag x Co 2 O 4 The preparation method of the spinel type composite oxide catalyst comprises the following preparation steps: weighing silver nitrate, manganese acetate tetrahydrate and hexaCobalt nitrate hydrate; weighing glucose; adding the weighed silver nitrate, manganese acetate tetrahydrate and cobalt nitrate hexahydrate into a mixed solution of methanol and ethylene glycol, stirring at room temperature, and dissolving for later use; adding the weighed glucose into the solution obtained in the third step, stirring and dissolving for later use; adding the pretreated polymethyl methacrylate template into the solution obtained in the fourth step, and dipping; pouring the redundant impregnation liquid into a distributed funnel for suction filtration, and then drying; and putting the dried sample into a tube furnace, heating the sample to 160 ℃ from the room temperature, keeping the temperature for 2-3h, then heating the sample to 600 ℃, keeping the temperature for 4-8h, and then naturally cooling the sample to the room temperature. Mn after doping with silver 1‑x Ag x Co 2 O 4 The catalyst has better catalytic activity and can eliminate more than 90% of soot. |