Method for improving low-temperature activity of coal ash-attapulgite manganese based selective catalytic reduction (SCR) catalyst
A SCR catalyst, manganese-based technology of protruding rods, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve good industrial application value, diameter expansion, and the effect of reducing the content of active components
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Embodiment 1
[0032] In this embodiment, the preparation process of fly ash-attapulgite manganese-based SCR catalyst is as follows:
[0033] 1. Preparation of composite carrier
[0034] Take fly ash and attapulgite at a mass ratio of 1:1, pulverize and mix uniformly to obtain particles with a particle size of 0.38-0.83m, and place the particles in an air atmosphere at 300°C for 3 hours to obtain a composite carrier FA- PG.
[0035] 2. Preparation of pickling solution
[0036] Using CH with a mass concentration ≥ 99.5% 3 Preparation of COOH solution [H + ]=1.2mol / L pickling solution.
[0037] 3. Pickling pretreatment
[0038] Take 10g of FA-PG, and test the saturated water absorption of the composite carrier (impregnation solid-liquid ratio) by equal volume impregnation method: 0.8mL / g;
[0039] Take 20g of FA-PG and immerse it into the pickling solution prepared in step 2 according to the solid-to-liquid ratio of immersion, and let it stand for 12 hours; divide the pickled composite c...
Embodiment 2
[0047] In this embodiment, the preparation process of fly ash-attapulgite manganese-based SCR catalyst is as follows:
[0048] 1. Preparation of composite carrier
[0049] The preparation method of step 1 is the same as embodiment 1.
[0050] 2. Preparation of pickling solution
[0051] Respectively use H with a mass concentration of 95-98% 2 SO 4 Sulfuric acid, nitric acid solution with a mass concentration of 65%, CH with a mass concentration ≥ 99.5% 3 Preparation of COOH solution and HCl solution with a mass concentration of 36-38% [H + ]=1.2mol / L pickling solution, and recorded as pickling solution 1, pickling solution 2, pickling solution 3 and pickling solution 4 in sequence.
[0052] 3. Pickling pretreatment
[0053] Take 10g of FA-PG, and test the saturated water absorption of the composite carrier (impregnation solid-liquid ratio) by equal volume impregnation method: 0.8mL / g;
[0054] Take four equal parts of FA-PG, respectively immerse in pickling solution 1, ...
Embodiment 3
[0061] 1. Preparation of composite carrier
[0062] The preparation method of step 1 is the same as embodiment 1.
[0063] 2. Preparation of pickling solution
[0064] Using CH with a mass concentration ≥ 99.5% 3 COOH solution was prepared separately [H + ]=0, 0.6, 1.2, 1.8, 2.4, 3, 4 and 5 mol / L pickling solutions, which are sequentially recorded as pickling solution a, pickling solution b, pickling solution c, pickling solution d, pickling solution Solution e, pickling solution f, pickling solution g and pickling solution h.
[0065] 3. Pickling pretreatment
[0066] Take 10g of FA-PG, and test the saturated water absorption of the composite carrier (impregnation solid-liquid ratio) by equal volume impregnation method: 0.8mL / g;
[0067] Take eight equal parts of FA-PG, dip them into the pickling solution a-h prepared in step 2 respectively according to the solid-to-liquid ratio of immersion, let it stand for 12 hours, take it out, dry it at 50°C for 2 hours, and then dr...
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