Denitration catalyst as well as preparation method and application thereof

[0026] The present invention provides a method for preparing the denitaridation catalyst described above, characterized in that the following steps are included:

[0027] The positive divalent manganese salt and the positive trivalent spermate were dissolved in water to obtain an active precursor solution;

[0028] The egg shell-type active alumina ball is impregnated into the active precursor solution, and the adsorbed system is dried to obtain semi-finished products;

[0029] The semi-finished product was immersed in a potassium permanganate solution, and the redox reaction was carried out, and the obtained solid product was sequentially washed and dried to give a denitrite catalyst.

[0030] In the present invention, the raw materials used are well known in the art without special instructions.

[0031] The invention is dissolved in water in water to water in water to obtain an active precursor solution.

[0032] In the present invention, the positive divalent manganese salt preferably comprises manganese acid manganese acid manganese acid, more preferably manganese acid; the positive trivalent salt, preferably comprises nitrate; the water is preferably deionized water.

[0033] In the present invention, the concentration of the positive divalent manganese salt in the active precursor solution is preferably from 0.1 to 0.2 g / ml, more preferably from 0.13 to 0.15 g / ml; the active precursor solution is a trivalent salt in the active precursor solution. The concentration is preferably 10 to 150 g / L, more preferably 20 to 120 g / L, more preferably 50 to 100 g / L.

[0034] After the active precursor solution was obtained, the present invention was immersed in the active precursor solution to the active precursor solution, and the adsorbed system was dried to give a semi-finished product.

[0035] In the present invention, the mass of the active precursor solution is preferably 2 to 8%, more preferably 4 to 6%, more preferably 5%, which is preferably 5%, preferably 4 to 6%, further preferably 5%. The amount of the positive divalent manganese salt is subsequently described.

[0036] In the present invention, the time of adsorption is preferably 10 to 14 h, more preferably from 12 to 13 h; the adsorption is preferably carried out under standby conditions. During the adsorption process of the present invention, the positive price of manganese ions and the positive trivalent ion were adsorbed into the surface and aperture of the egg shell type active alumina ball.

[0037] In the present invention, the drying temperature is preferably 60 to 100 ° C. The present invention does not have a special requirement for the drying time to achieve complete evaporation of water in the system after adsorption. As a further preferred embodiment, the present invention is preferably dried in six0 ° C for 5 h and 100 ° C for 5 h. The present invention uses segmented drying, which can prevent rapid drying to cause semi-finished products to rupture.

[0038] After the semi-finished product was obtained, the semicondu product was impregnated into a potassium permanganate solution, and the redox reaction was carried out, and the obtained solid product was sequentially washed and dried to give a denitrite catalyst.

[0039] In the present invention, the mass concentration of the potassium permanganate solution is preferably 8 to 11%, more preferably 8.5 to 10.5%, still more preferably 9 to 10%.

[0040] In the present invention, the total mass of manganese in manganese and positive diener in the potassium permanganate solution is preferably 3 to 12%, more preferably 5 to 10% of the egg shell type active alumina ball mass. Further, it is more preferably 8%.

[0041] In the present invention, the molar ratio of the potassium of the positive divalent manganese salt to the potassium permanganate solution is preferably (1 to 2): 1, more preferably (1.2 to 1.8); potassium The molar ratio of the positive trivalent salt of potassium permanganate and the active precursor solution in the solution is preferably (2 to 10): 1, more preferably (2 to 6): 1.

[0042] In the present invention, the oxidative reaction time is preferably from 8 to 12 h, more preferably from 10 to 12 h. The present invention is preferably carried out under astostatic conditions for the oxidation reactions. The present invention reacts the manganese oxide and the oxide in terms of potassium permanganate and positive ferrous salts and orthodontic salts.

[0043] In the present invention, the washing liquid used for the washing is preferably water. The present invention is preferably washed to a pH of 7.

[0044] In the present invention, the drying temperature is preferably 60 to 110 ° C, and the dry time is preferably 15 to 20 h. Further preferred, the present invention is preferably dried in sixHh and 110 ° C for 6 h. The present invention uses segmented drying, which can prevent rapid drying results in catalyst rupture.

[0045] The present invention provides the application of a denitrification catalyst prepared by the preparation method of the above scheme or the preparation method according to the above scheme, containing a nitrogen oxide in the flue gas.

[0046] The present invention does not have a special requirement for the application, and it is possible to use the application methods well known in the art.

[0047] In the present invention, the temperature of the flue gas is preferably from 100 to 300 ° C, more preferably 150 to 250 ° C, most preferably 200 ° C. In the present invention, the flue gas is preferably a dust-free flue gas. The present invention does not do specific species of nitrogen oxides in the flue gas, which are well known in the art, and specific, for example, NO, NO 2.

[0048] The present invention has no special requirements for the concentration of nitrogen oxides in the flue gas. In an embodiment of the invention, the concentration of nitrogen oxides in the flue gas is 300 ppm, and the concentration of ammonia is 300 ppm.

[0049] In the present invention, the amount of the catalyst and the flue gas flow rate are not particularly required. In the embodiment of the present invention, the denitration catalyst is from 0.1 g, and the flue gas flow rate is 1000 ml / min.

[0053] Example 1

[0054] 10 ml of deionized water into the beaker, weighing 1.44 g (8.32 mmol) acetate, 0.224 g (0.67 mmol) nitric acid is placed in a good deionized water, dissolved, and the active precursor solution is obtained; 10G egg shell type active alumina ball (particle size is 4 to 6 mm, the specific surface area is 300m 2 / g), placed in a preformed active precursor solution, and allowed to be adsorbed for 12 h, then in order to dryness at 60 ° C for 5 h, dried at 100 ° C for 5 h, and the dried semi-finished product was placed to 10 ml of mass concentration of 8.95% (5.66 mmol) In the potassium permanganate solution, it allows for 12 h to perform an oxidative reaction, and the resulting solid product is washed, the water washed to the pH, and finally at 60 ° C for 12 h, 110 ° C for 6 h, and the denitrifination catalyst is obtained. The mass of manganese is 8% of the quality of the egg shell type active alumina ball. The mass of the 钐 is 1% of the quality of the egg shell type active aluminum oxide, and is remembered as Mn8SM1 / Al 2 O 3.

[0055] Example 2

[0056] The weighing 10 ml of deionized water into the beaker, weighing (7.92 mmol) 1.37 g of manganese acetate, 0.448 g (1.33 mmol) nitrate placed in a good deionized water, dissolved, and obtained an active precursor solution; 10G egg shell type active alumina ball (particle size is 4 to 6 mm, the specific surface area is 300m 2 / g), placed in a preformed active precursor solution, and allowed to be adsorbed for 12 h, then at 60 ° C for 5 h, dried at 100 ° C for 5 h, and the dried semi-finished product was placed to 10 ml of mass concentration of 9.47% (6.0 mmol) In the potassium permanganate solution, the oxidation reaction was allowed to perform an oxidative reaction, and the resulting solid product was washed, and the water washed to a pH of 7, and finally at 60 ° C for 12 h, 110 ° C drying for 6 h, which obtained the denitrifination catalyst, wherein The mass of manganese is 8% of the quality of the egg shell-type active alumina ball, the mass of the egg shell is 2% of the egg shell-type active alumina ball, remembered as Mn8SM2 / Al 2 O 3.