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Process for producing flue gas denitration catalyst and flue gas denitration catalyst produced with the process

A denitration catalyst, catalyst slurry technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor mechanical strength and improve rheological properties , good catalytic effect, simple preparation process

Inactive Publication Date: 2009-05-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor mechanical strength of the existing denitration catalyst after molding, and to provide a preparation method of the denitration catalyst and the denitration catalyst prepared by the method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 50g of nano titanium dioxide, 1g of PVA and 4g of HPMC, mix well, add 5g of glycerin, 55g of tungsten vanadium solution, the content of ammonium tungstate in the solution is 5.5g, the content of ammonium metavanadate is 2.5g, stir and mix well until it becomes a thick paste. The slurry was coated on a stainless steel mesh, after uniformly blade coating, dried at 120°C for 1 hour after rolling, and calcined at 430°C for 48 hours. Titanium dioxide is anatase type, and its compressive strength after molding is 50N / cm. The catalyst simulates flue gas conditions in the laboratory, NH 3 As a reducing agent, the initial concentration of NO is 800ppm, and O 2 5.5%(v / v), the balance gas in the mixture is N 2 , NH 3 / NO=1:1, the airspeed is 9000h -1 , The denitration efficiency of the catalyst is 92%.

Embodiment 2

[0018] Take 50g of nano titanium dioxide, 2g of PVA and 3g of HPMC, mix well, add 5g of glycerin, 55g of tungsten vanadium solution, the content of ammonium tungstate in the solution is 6g, and the content of ammonium metavanadate is 3g, stir and mix well until it becomes a thick paste. The slurry was spread on a stainless steel mesh, after uniformly blade coating, rolled and dried at 110°C for 0.5h, and calcined at 400°C for 36h. Titanium dioxide is anatase type, and its compressive strength after molding is 48N / cm. The catalyst simulates flue gas conditions in the laboratory, NH 3 As a reducing agent, the initial concentration of NO is 800ppm, and O 2 5.5%(v / v), the balance gas in the mixture is N 2 , NH 3 / NO=1:1, the airspeed is 9000h -1 , The denitration efficiency of the catalyst is 90%.

Embodiment 3

[0020] Take 50g nano titanium dioxide, 2.5g PVA and 2.5g HPMC, mix well, add 5g triethanolamine, 55g tungsten vanadium solution, the content of ammonium tungstate in the solution is 5g, the content of ammonium metavanadate is 2.8g, stir and mix evenly until a thick paste shape. The slurry was coated on a stainless steel mesh, after uniform coating, rolled and dried at 130°C for 1 hour, and calcined at 430°C for 24 hours. Titanium dioxide is anatase type, and its compressive strength after molding is 55N / cm. The catalyst simulates flue gas conditions in the laboratory, NH 3 As a reducing agent, the initial concentration of NO is 800ppm, and O 2 5.5%(v / v), the balance gas in the mixture is N 2 , NH 3 / NO=1:1, the airspeed is 9000h -1 , The denitration efficiency of the catalyst is 90%.

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Abstract

The invention relates to a method for preparing a catalyst for flue gas denitrification. The method comprises the following steps: step 1: preparing a powder mixture of titanium dioxide nanoparticles, binders and auxiliaries; step 2: preparing an oxalic acid solution of tungsten and vanadium; step 3: mixing the powder mixture produced in the step 1 and the solution produced in the step 2 to obtain a catalyst slurry; and step 4: uniformly spreading the catalyst slurry produced in the step 3 on a surface-treated stainless steel net, rolling and molding, drying and calcining to obtain the final catalyst. Furthermore, the invention also relates to a catalyst for flue gas denitrification, which is prepared by the method. The catalyst with high mechanical strength and excellent catalytic activity overcomes the problem that the prior catalyst for flue gas denitrification has poor mechanical strength after molding.

Description

Technical field: [0001] The invention relates to a method for preparing a catalyst for flue gas denitration and a flue gas denitration catalyst prepared by the method. Background technique: [0002] Nitrogen oxides are toxic and harmful gases and are one of the main sources of acid rain. They cause serious damage to the environment. Under certain conditions, they can also generate more toxic photochemical smog, causing plant deaths and human deaths. Nitrogen oxides in the flue gas of coal-fired power generation are the main source of pollution. The research, development and application of economically feasible denitrification technology is an inevitable requirement to ensure national industrial development and environmental protection standards. At present, selective catalytic reduction (SCR) technology is the most widely used and most popular Effective flue gas denitration technology, the catalyst used is a vanadium-based catalyst system. As early as the 1870s and 1980s, the ind...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/22B01J21/06B01D53/56
Inventor 孙克宁乔金硕邵延斌
Owner HARBIN INST OF TECH
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