Honeycomb-like SCR 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, can solve the problems of weak toughness of the green body, cracks, and influence on the mechanical strength of the finished product, and achieve the improvement of mechanical strength and the reduction of crack generation rate Effect
Inactive Publication Date: 2018-08-17
HUADIAN QINGDAO ENVIRONMENTAL TECHNOLOCY CO LTD
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This leads to weak toughness of the green body of the catalyst, which is prone to cracks during the drying process, so the mechanical strength of the finished product after calcination is also affected to a certain extent
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Embodiment 1
[0041] Put 1000kg titanium dioxide, 80kg carboxymethyl cellulose and 50kg polyoxyethylene into the mixer and mix thoroughly, add 80kg of Rp-chop and glass fiber in total, stir for 5min, the speed is 200r / min, and the particle size of titanium dioxide is d 10 = 0.56um, d 50 =1.27um, d 90 =3.64um, fiber diameter R=7um, distribution of fiber length L: 8kg for 3mm fiber, 64kg for 7mm fiber, and 8kg for 20mm fiber. Add 500kg deionized water, 50kg ammonium metavanadate, 100kg ammonium metatungstate, 300kg ammonia water, 100kg lactic acid, 10kg cerium nitrate hydrate, 1kg praseodymium nitrate hydrate, stir for 25min; turn on the dehumidifier, dehumidify for 35min, and finally get The material moisture content is 26.2%. 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...
Embodiment 2
[0043] 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 =0.67um, d 50 =1.12um, d 90 =2.37um, the diameter R of the fiber=7um, the distribution of the fiber length L is: 3.5mm fiber 23kg, 6.5mm fiber 45kg, 12mm fiber 22kg, all the other are the same as embodiment one.
Embodiment 3
[0045]In the present embodiment, the fiber selected to add is a total of 80kg of Rp-chop, wood pulp and glass fiber, wherein the particle size of titanium dioxide is d 10 =0.64um, d 50 =1.08um, d 90 =2.21um, the diameter R of the fiber=7um, the distribution of the fiber length L is: 20kg of 3.5mm fiber, 40kg of 6mm fiber, 20kg of 12mm fiber, and the rest are the same as in Example 1.
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Abstract
The invention relates to a honeycomb-like SCR denitration catalyst and a preparation method thereof, and belongs to the technical field of SCR catalysts. The honeycomb-like SCR denitration catalyst isprepared from the following raw materials: titanium dioxide, carboxymethyl cellulose, polyethylene oxide, fiber, deionized water, ammonium metavanadate, ammonium metatungstate, aqueous ammonia, lactic acid, cerium nitrate hexahydrate and praseodymium nitrate hexahydrate; wherein the relationship between the diameter R of the fiber and the average particle size d50 of the titanium dioxide is R=3 to 8d50; the relationship between the fiber length L at the diameter R and the particle size d of the titanium dioxide is L=5000 to 6000d, the value range of d is d10 to d90; the ratio of the added mass m1 of the fiber to the added mass m2 of the titanium white is m1: m2 = 0.06 to 0.15:1. The crack generation rate in the drying process of the honeycomb-like SCR denitration catalyst prepared by fiber optimization selection is significantly reduced, and the mechanical strength of the finished product is remarkably 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. However, fibers with a fixed length are generally...
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