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Integral honeycomb denitration catalyst for WO3 addition technology and preparation method of catalyst

A denitration catalyst and honeycomb-type technology are applied in the field of new compounding process catalysts and their preparation, which can solve the problems of high catalyst cost and achieve the effects of good chemical stability, high surface chemical activity and high specific surface area.

Inactive Publication Date: 2015-03-04
CHONGQING UNIV +1
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  • Summary
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  • Claims
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Problems solved by technology

At present, the limitation of domestic process conditions and the monopoly of foreign advanced technology lead to high catalyst costs

Method used

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  • Integral honeycomb denitration catalyst for WO3 addition technology and preparation method of catalyst

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preparation example Construction

[0020] A kind of WO 3 The integral honeycomb denitration catalyst of the new additive process is composed of the following components by weight percentage: WO 3 4%~8%, V 2 o 5 1%-1.5%, TiO 2 80.5%~90%, binder 5%~10%; WO 3 The precursor solution is added in the process of catalyst mixing and sliming. The WO 3 A method for preparing a monolithic honeycomb denitration catalyst with a novel additive process, comprising the following steps:

[0021] 1) Weigh the tungsten salt precursor (ammonium metatungstate, ammonium tungstate or ammonium paratungstate) according to the WO in the catalyst 3 Based on the formula amount of 4%~8%, add an appropriate amount of oxalic acid solution and heat at 60~85°C to prepare the tungsten salt precursor solution; at the same time, weigh the catalyst active component precursor ammonium metavanadate, 2 o 5 Formula amount is 1%~1.5%, add appropriate amount of oxalic acid solution and heat at 60~85°C to prepare catalyst active solution;

[...

Embodiment 1

[0027] 1) Preparation of tungsten salt precursor solution: Weigh 0.428kg of ammonium metatungstate, add 800mL of deionized water, heat to 65°C, and keep warm for 12 minutes to dissolve;

[0028] Preparation of active solution: weigh 0.131kg of ammonium metavanadate, add 1400mL of oxalic acid solution (10% concentration) and heat at 70°C for 15 minutes;

[0029] 2) Weigh 0.735kg of glass fiber (binder) and 8.706kg of industrial-grade anatase titanium dioxide, put them into the mixer and stir for 5 minutes, then add 280 mL of deionized water, and the above-mentioned tungsten salt precursor solution and active solution;

[0030] 3) After being fully stirred, after cooling and adjustment, the material shall be stale for 22 hours to be extruded;

[0031] 4) Extrude the monolithic honeycomb catalyst with the material that meets the requirements in the extruder, dry at 60°C for 1 hour, dry at 105°C for 2 hours, calcinate at 250°C for 3.5 hours, and calcinate at 530°C for 5 hours to o...

Embodiment 2

[0033]1) Weigh 0.624kg of ammonium metatungstate, add 1200mL of deionized water, heat at 60°C, and keep warm for 15 minutes to dissolve to prepare a tungsten salt precursor solution; weigh 0.147kg of ammonium metavanadate, add 1500mL of oxalic acid solution (volume percentage is 10%) heated to prepare an active solution;

[0034] 2) Weigh 0.723 kg of binder (0.5 kg of glass fiber, 0.223 kg of carboxymethyl cellulose) and 8.649 kg of industrial grade anatase titanium dioxide, add them into the mixer and stir for 5 minutes, then add 220 mL of deionized water, tungsten salt Precursor solution and ammonium metavanadate active solution;

[0035] 3) After full stirring, after cooling and adjustment, the material will be stale for 20 hours and then be extruded;

[0036] 4) Extrude the monolithic honeycomb catalyst from the extruder, dry at 75°C for 1 hour, dry at 100°C for 2 hours, calcinate at 230°C for 4.5 hours, and calcinate at 550°C for 6 hours to obtain the finished catalyst B...

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Abstract

The invention discloses an integral honeycomb denitration catalyst for a novel WO3 addition technology. The integral honeycomb denitration catalyst comprises, by weight, 4%-8% of WO3, 1%-1.5% of V2O5, 80.5%-90% of TiO2 and 5%-10% of adhesives, wherein the WO3 is added into precursor solution in a catalyst mixing procedure. The honeycomb denitration catalyst is prepared by extruding, drying and calcining materials, has fine chemical stability, heat stability and SO2 oxidization resistance, represents high NH3-SCR (selective catalytic reduction) catalytic activity and a wide active temperature window, has a large specific surface area, high chemical surface activity and fine catalytic effects, and can meet the requirement of flue gas denitration. Compared with the method of leading in WO3 by directly mixing TiO2-WO3 composite powder serving as a raw material, the preparation technology is simpler without relying on imported TiO2-WO3 composite powder, nationally rich titanium resources are made full use of, the cost of the catalyst is reduced, Chinese industrialization progress of the denitration catalyst can be promoted, and popularization of the flue gas denitration technology in China is promoted.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to auxiliary agent WO in flue gas SCR denitrification catalyst 3 A novel compounding process catalyst and a preparation method thereof. Background technique [0002] NOx pollution to the environment has become an increasingly serious global problem. NOx is easy to form photochemical smog, which will not only reduce visibility, but also have a strong poisonous effect on human eyes, respiratory tract and lungs; it will also cause ozone layer destruction and greenhouse effect; at the same time, NOx is also one of the main acidic substances that form acid rain. The nature of acid rain has begun to transform from a single sulfuric acid type to a compound type with increasing nitrate ions. Statistics show that the total emission of nitrogen oxides in my country in 2010 was 17.977 million tons. If no further measures are taken to control it, it is estimated that by 2020,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/04B01D53/90B01D53/56
Inventor 刘清才贺媛媛吴国防席文昌杨剑徐敏人丁健许志鹏徐晶刘浪兰苑培保思敏张洋宾文娟
Owner CHONGQING UNIV
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