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SCR (Selective Catalytic Reduction) honeycomb type denitration catalyst and preparation method thereof
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A technology of denitrification catalyst and honeycomb type, which is applied in the field of SCR honeycomb type denitrification catalyst and its preparation, and can solve the performance problems of difficult denitrification catalysts
Inactive Publication Date: 2019-03-12
HUADIAN QINGDAO ENVIRONMENTAL TECHNOLOCY CO LTD
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Problems solved by technology
In the preparation process of the denitration catalyst, fibers of unspecified size are still the main materials, while the particle size of the main substrate of the catalyst, titanium dioxide (content greater than 85%), is within a distribution range, see figure 1 , it is difficult to optimize the performance of existing denitrification catalysts
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preparation example Construction
[0048] The specific steps of the preparation method are as follows:
[0049] Add titanium dioxide, carboxymethyl cellulose, and polyethylene oxide into the mixer and mix thoroughly, add fibers, and stir for 5 minutes at a speed of 200 r / min. Add deionized water, ammonium metavanadate, ammonium metatungstate, ammonia water, lactic acid, cerium nitrate hexahydrate, and praseodymium nitrate hexahydrate, and stir for 25 minutes; turn on the dehumidifier and dehumidify for 35 minutes, and the moisture content of the final material is 25-30%.
[0050]The material is extruded through the filter plate with SCR porous catalyst wet embryo to filter, and the material whose particle size is smaller than the mesh of the filter plate is left, and the filtered material is subjected to mud treatment; the processed material is put into the extruder and extruded into shape; The formed materials are stacked on the primary drying kiln car with wet-end automation equipment, and the primary drying...
Embodiment 1
[0052] In this embodiment, 1000 kg of titanium dioxide is used, and the fiber selected to be added is 80 kg of Rp-chop and glass fiber, wherein the particle size of titanium dioxide is d 10 = 0.56 μm, d 50 = 1.27 μm, d 90 =3.64 μm, fiber diameter R=7 μm, distribution of fiber length L is 8 kg for 3 mm fibers, 64 kg for 7 mm fibers, and 8 kg for 20 mm fibers.
[0053] Among them, R=5.51d 50 ;L=5357d 10 、5511d 50 、5494d 90 , the weight ratio of three different length fibers is 1:8:1, and the weight ratio of fiber to titanium dioxide is 0.08:1.
Embodiment 2
[0055] In the present embodiment, the fiber selected to add is 90kg of wood pulp and glass fiber, wherein the particle size of titanium dioxide is d 10 = 0.67μm, d 50 = 1.12 μm, d 90 = 2.37 μm, fiber diameter R = 7 μm, and distribution of fiber length L: 22.5 kg of 3.5 mm fibers, 45 kg of 6.5 mm fibers, and 22.5 kg of 12 mm fibers.
[0056] Among them, R=6.25d 50 , L=5223d 10 、5803d 50 、5063d 90 , the adding weight ratio of three different length fibers is 1:2:1, the adding mass ratio of fiber and titanium dioxide is: 0.09:1, and the rest are the same as in Example 1.
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Abstract
The invention discloses a SCR (Selective Catalytic Reduction) honeycomb type denitration catalyst and a preparation method thereof, and belongs to the technical field of SCR catalysts. The SCR honeycomb type denitration catalyst is prepared from raw materials comprising the following ingredients: titanium dioxide, carboxymethylcellulose, polyoxyethylene, fiber, deionized water, ammonium metavanadate, ammonium metatungstate, ammonium hydroxide, lactic acid, cerous nitrate hexahydrate and praseodymium nitrate hexahydrate, wherein a relationship between the diameter R of the fiber and the averagegranularity d50 of the titanium dioxide is that R is equal to 3-8 d50, a relationship between the fiber length L under the diameter R and the granularity d of the titanium dioxide is that L is equalto 5000-6000 d, and the value range of d is d10-d90; a ratio of the adding mass m1 of the fiber to the adding mass m2 of the titanium dioxide is that m1:m2 is equal to (0.06 to 0.15):1. The crack generation rate in a drying process of the SCR honeycomb type denitration catalyst prepared after the optimal selection of the fiber can be obviously lowered, and the mechanical strength of a finished product is obviously improved.
Description
technical field [0001] The invention relates to an SCR honeycomb denitration catalyst and a preparation method thereof, belonging to the technical field of SCR catalysts. Background technique [0002] The denitrification transformation of thermal power plants in my country has been completed, and the SCR honeycomb denitrification catalyst currently in use has experienced the first cycle. From the perspective of use, a large number of catalysts are damaged due to poor mechanical properties, which is not conducive to the regeneration and utilization of catalysts. [0003] In the preparation process of SCR honeycomb catalyst, certain fibers will be added, including Rp-chop, wood pulp, glass fiber, etc., which play the role of creating holes, increasing the toughness of the embryo body and the mechanical strength of the finished product. The effect of the fiber is affected by the particle size of the substrate. great influence. [0004] At present, for the improvement of the m...
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