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A kind of preparation method of honeycomb cupric chloride/scr mercury removal catalyst

A copper chloride and catalyst technology, which is applied in the field of electric power environmental protection, can solve the problems of active component loss, poor high temperature stability, catalyst performance and service life, and achieve the effect of ensuring uniformity

Active Publication Date: 2021-12-28
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: during the drying process, as a soluble salt, copper chloride will migrate to the surface of the catalyst to form enrichment with the evaporation of water, that is, the common "salting out" and "frosting" in the molding process of ceramic products will appear. Phenomenon, leading to uneven dispersion of active components in the catalyst, affecting catalytic performance
At the same time, copper chloride is a volatile substance with poor high-temperature stability. Operating at high temperature for a long time will easily lead to the loss of active components, which will have a significant impact on the performance and life of the catalyst.

Method used

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  • A kind of preparation method of honeycomb cupric chloride/scr mercury removal catalyst
  • A kind of preparation method of honeycomb cupric chloride/scr mercury removal catalyst

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preparation example Construction

[0030] The invention provides a honeycomb CuCl 2 The preparation method of / SCR demercuration catalyst comprises the steps:

[0031] (1) Preparation of alumina loaded cupric chloride-potassium chloride powder;

[0032] γ-Al 2 o 3 Added as a carrier containing CuCl 2 and KCl aqueous solution, stirred for 8-12 hours, dried at 110-120°C for 4-6 hours, then calcined at 490-500°C for 4-6 hours, finally crushed and ground to about 2000 mesh with a ball mill, that is Alumina supported cupric chloride-potassium chloride powder, ie CuCl 2 -KCl / γ-Al 2 o 3 powder. in CuCl 2 -KCl / γ-Al 2 o 3 In powder, CuCl 2 The mass fraction of copper chloride is 1-10%, the molar ratio of potassium chloride to copper chloride is (2-5):1, and the mass concentration of salt (copper chloride+potassium chloride) in the aqueous solution is 3-5%.

[0033] (2) mixing of catalyst raw materials;

[0034] Titanium tungsten powder, titanium tungsten silicon powder and CuCl 2 -KCl / γ-Al 2 o 3 Add the p...

Embodiment 1

[0040] A kind of honeycomb CuCl provided by the invention 2 The preparation method of / SCR demercuration catalyst comprises the following steps:

[0041] (1) Preparation of alumina-loaded copper chloride-potassium chloride powder

[0042] γ-Al 2 o 3 CuCl was added as a carrier 2 and KCl aqueous solution, stirred for 8-12 hours, dried at 110-120°C for 4-6 hours, then calcined at 490-500°C for 4-6 hours, finally crushed and ground to about 2000 mesh with a ball mill, that is Alumina supported cupric chloride-potassium chloride powder, ie CuCl 2 -KCl / γ-Al 2 o 3 powder. in CuCl 2 -KCl / γ-Al 2 o 3 In powder, CuCl 2 The mass fraction of copper chloride is 1%, the molar ratio of potassium chloride to copper chloride is 2:1, and the mass concentration of salt (copper chloride + potassium chloride) in the aqueous solution is 3-5%.

[0043] (2) Mixing of catalyst raw materials

[0044] Titanium tungsten powder, titanium tungsten silicon powder and CuCl 2 -KCl / γ-Al 2 o 3 Ad...

Embodiment 8

[0056] A kind of honeycomb CuCl provided by the invention 2 The preparation method of / SCR demercuration catalyst comprises the following steps:

[0057] (1) Preparation of alumina-loaded copper chloride-potassium chloride powder

[0058] γ-Al 2 o 3 CuCl was added as a carrier 2 and KCl aqueous solution, stirred for 8 hours, dried at 110°C for 6 hours, then calcined at 490°C for 6 hours, finally crushed and ground to about 2000 mesh with a ball mill to obtain alumina-supported copper chloride-chloride Potassium powder, i.e. CuCl 2 -KCl / γ-Al 2 o 3 powder. in CuCl 2 -KCl / γ-Al 2 o 3 In powder, CuCl 2 The mass fraction of potassium chloride is 10%, the molar ratio of potassium chloride to copper chloride is 5:1, and the mass concentration of salt (copper chloride+potassium chloride) in the aqueous solution is 3%.

[0059] (2) Mixing of catalyst raw materials

[0060] Titanium tungsten powder, titanium tungsten silicon powder and CuCl 2 -KCl / γ-Al 2 o 3 Add the powder...

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Abstract

A kind of preparation method of honeycomb cupric chloride / SCR demercuration catalyst, γ-Al 2 o 3 Add containing CuCl 2 and KCl aqueous solution, stirred evenly, dried, then calcined, and ground to obtain powder; put the above powder and titanium tungsten powder and titanium tungsten silicon powder into a kneader for pre-mixing, then add deionized water, stearic acid and lactic acid, Adjust the pH value to 7-8, continue mixing, then add glass fiber, hardwood pulp, carboxymethyl cellulose and polyoxyethylene alcohol, and then mix to obtain mud, after aging, add mud Mixing in a vacuum mud mixer, and aging the mixed mud again. Finally, put the aged vacuum sludge into the extruder to extrude, then dry and calcinate. This method significantly improves the dispersion of the active components in the catalyst. At the same time, the obtained mercury removal catalyst has excellent mercury catalytic oxidation performance, and has broad application prospects in the field of mercury removal from coal-fired flue gas.

Description

technical field [0001] The invention belongs to the technical field of electric power environmental protection, and relates to a preparation method of a catalyst monomer that can be used for demercuration of coal-fired flue gas, in particular to a preparation method of a honeycomb cupric chloride / SCR demercury catalyst. Background technique [0002] In recent years, with the country's emphasis on environmental protection, mercury removal from coal-fired flue gas has received widespread attention. Countries, regions and industries have promulgated corresponding air pollutant emission standards for coal-fired boilers, and put forward binding indicators for mercury emission values ​​(50ug / m 3 / GB13271-2014,8ug / m 3 / DB50 / 659-2016,30ug / m 3 / DB31 / 387-2017,8ug / m 3 / DB31 / 860-2014). Therefore, it is of great significance to study the mercury removal technology of coal-fired flue gas. [0003] SCR mercury removal is the use of SCR catalysts to remove the difficult-to-remove eleme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/04B01J27/132B01J27/122B01D53/86B01D53/64
CPCB01J27/132B01J27/122B01D53/8665B01D2257/602B01D2258/0283B01J35/56
Inventor 程广文杨嵩郭中旭付康丽赵瀚辰
Owner XIAN THERMAL POWER RES INST CO LTD