Method for additionally impregnating active component for regeneration of denitration catalyst
A denitrification catalyst and active component technology, which is applied in the field of selective catalytic reduction catalysts, can solve problems such as equipment corrosion, and achieve the effects of low cost, simple operation, and reduced wall thickness
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Embodiment 1
[0027] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 20000 hours of V 2 o 5 -MoO 3 / TiO 2 Flat-plate denitration catalyst.
[0028] Pretreatment of the denitrification catalyst: blowing compressed air to remove the ash on the surface of the catalyst and in the pores, and then immersing the catalyst in NaOH solution at 25°C for 1h. Re-immersed in H 2 SO 4 In solution, 80°C, 0.1h. Finally, wash with deionized water three times, dry at 120°C for 4 hours, and bake at 450°C for 6 hours.
[0029] Elemental analysis was carried out on the catalyst, and the loss of active component element V was 40.2%.
[0030] After the pretreated denitration catalyst was evacuated (vacuum degree -0.1Mpa, 1h), it was immersed in toluene for 0.3h, followed by primary drying at 80°C for 0.2h. Then immerse the denitration catalyst in the mixed aqueous solution of ammonium metavanadate, ammonium heptamolybdate and thiohydroxysuccinic acid for 4 ...
Embodiment 2
[0034] The denitration catalyst used and its pretreatment steps are the same as in Example 1.
[0035] After the pretreated denitration catalyst was evacuated (vacuum degree -0.1Mpa, 1h), it was soaked in dichloromethane for 1h, and then it was dried at 30°C for 0.5h. Then the denitrification catalyst was immersed in the mixed aqueous solution of ammonium metavanadate, copper nitrate and citric acid for 8 hours, then secondary dried at 80°C for 10 hours, and calcined at 500°C for 6 hours to obtain the regenerated denitrification catalyst. Wherein the mass percent composition of citric acid in the mixed aqueous solution is 5wt%, the mass percent composition of copper nitrate is 5wt%; The amount of active component element V in the mixed aqueous solution is 95% of its loss.
[0036] The performance evaluation of the denitrification catalyst was carried out in the fixed bed reactor in the laboratory. The evaluation conditions were: the temperature was 380°C, and the flue gas surfac...
Embodiment 3
[0039] The deactivated denitrification catalyst is selected from a coal-fired power plant in China after 22000 hours of V 2 o 5 -WO 3 / TiO 2 Honeycomb denitrification catalyst.
[0040] The pretreatment method of the denitration catalyst: wash with high-pressure water to remove the dust on the surface of the catalyst and in the pores, and then impregnate the catalyst in Na 2 CO 3 In solution, 80°C, 0.1h. Re-impregnated in HNO 3 solution, 25 ° C, 1h. Finally, wash with deionized water once, dry at 120°C for 10 hours, and bake at 550°C for 4 hours.
[0041] Elemental analysis was carried out on the catalyst, and the loss of active component element V was 32.5%.
[0042] After the pretreated denitration catalyst was evacuated at room temperature (vacuum degree -0.15Mpa, 0.5h), it was impregnated with ethyl acetate for 2h, followed by primary drying at 70°C for 0.1h. Then immerse the denitration catalyst in the mixed aqueous solution of ammonium metavanadate, ammonium par...
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