Method for preparing diesel vehicle exhaust gas purification molecular sieve
A tail gas purification and molecular sieve technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of narrow temperature range, poor low-temperature activity of catalysts, high price, etc., achieve good hydrothermal stability, and improve low-temperature denitrification Performance, the effect of improving high temperature activity
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[0021] Example 1
[0022] The preparation method of a diesel vehicle exhaust purification molecular sieve of the present embodiment comprises the following steps:
[0023] (1) Dissolve aluminum sulfate and manganese nitrate in deionized water, then slowly add tetraethylammonium hydroxide to the solution, stir magnetically for 30 min, then add sodium hydroxide, add silica sol after stirring for 30 min, and mix gel with stirring 2h to obtain the precursor solution;
[0024] (2) The precursor solution obtained in step (1) is transferred to a hydrothermal reactor, placed in a homogeneous reactor for crystallization at a temperature of 110-130 ° C for 3 days, the solution obtained after 3 days is filtered and washed, then Dry at 110-130°C for 4-24h, and then calcinate at 400-600°C for 2-6h in a muffle furnace to obtain untreated molecular sieves;
[0025] (3) Put the molecular sieve obtained in step (2) into a constant temperature water bath, then add 0.12mol / L ammonium nitrate s...
Example Embodiment
[0028] Example 2
[0029] The preparation method of a diesel vehicle exhaust purification molecular sieve of the present embodiment comprises the following steps:
[0030] (1) Dissolve aluminum sulfate and manganese nitrate in deionized water, then slowly add tetraethylammonium hydroxide to the solution, stir magnetically for 30 min, then add sodium hydroxide, add silica sol after stirring for 30 min, and mix gel with stirring 2h to obtain the precursor solution;
[0031] (2) The precursor solution obtained in step (1) is transferred to a hydrothermal reactor, placed in a homogeneous reactor for crystallization at a temperature of 110-130 ° C for 3 days, the solution obtained after 3 days is filtered and washed, then Dry at 110-130°C for 4-24h, and then calcinate at 400-600°C for 2-6h in a muffle furnace to obtain untreated molecular sieves;
[0032] (3) put the molecular sieve obtained in step (2) into a constant temperature water bath, then add 0.12mol / L ammonium nitrate s...
Example Embodiment
[0035] Example 3
[0036] The preparation method of a diesel vehicle exhaust purification molecular sieve of the present embodiment comprises the following steps:
[0037] (1) Dissolve aluminum sulfate and manganese nitrate in deionized water, then slowly add tetraethylammonium hydroxide to the solution, stir magnetically for 30 min, then add sodium hydroxide, stir for 30 min, add silica sol, mix gel and stir 2h to obtain the precursor solution;
[0038] (2) The precursor solution obtained in step (1) is transferred to a hydrothermal reactor, placed in a homogeneous reactor for crystallization at a temperature of 110-130 ° C for 3 days, the solution obtained after 3 days is filtered and washed, then Dry at 110-130°C for 4-24h, and then calcinate at 400-600°C for 2-6h in a muffle furnace to obtain untreated molecular sieves;
[0039] (3) put the molecular sieve obtained in step (2) into a constant temperature water bath, then add 0.12mol / L ammonium nitrate solution to carry o...
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