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Denitration catalyst and method for preparing denitration catalyst from waste denitration catalyst

A technology of waste denitration catalyst and denitration catalyst, which is applied in the field of denitration catalyst, can solve the problems of difficult removal of catalyst poisoned metals, complex recovery process, and low catalyst life, so as to achieve less secondary pollution, simple process flow, and simplified process flow Effect

Pending Publication Date: 2021-03-30
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the problems existing in the prior art that the waste denitrification catalyst is difficult to recover, the poisoned metal in the catalyst is difficult to be removed, the life of the catalyst obtained by recycling the waste catalyst is low, and the recovery process is complicated and easily causes secondary pollution. , provide a method for preparing a denitration catalyst from a waste denitration catalyst, and a denitration catalyst prepared by the method. The method has the characteristics of simple process flow, less secondary pollution, and low cost, and the denitration catalyst prepared thereby has excellent Catalytic performance, able to meet the needs of actual production

Method used

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  • Denitration catalyst and method for preparing denitration catalyst from waste denitration catalyst
  • Denitration catalyst and method for preparing denitration catalyst from waste denitration catalyst

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Effect test

Embodiment 1

[0116] 1) Grind 100 g of the spent denitration catalyst until the particle size is between 300 and 500 mesh, and then add 200 ml of H2O with a mass concentration of 90 wt % 2 SO 4 solution, reacted at 150°C for 3 hours, and then filtered to obtain filtrate and filter residue.

[0117] 2) Wash the filter residue in step 1) with deionized water until the pH of the filtrate is 1.5, then centrifuge, and dry the filter cake in an oven at 120° C. for 24 hours.

[0118] 3) Use alkali to adjust the pH value of the filtrate in step 1) to 3.0, use N235 as the extractant, O / A=1:8, centrifuge the extract, adjust the pH of the extract to about 10 with ammonia water, add 4M Back extraction with ammonia water, O / A=2:1, to obtain vanadium + tungsten mixed solution.

[0119] 4) Pulverize the vanadium-tungsten-titanium powder obtained in step 1) to about 300 meshes, and then add the obtained vanadium+tungsten mixed solution, water, binder, lubricant, pore-forming agent, surfactant, and struct...

Embodiment 2

[0122] Adopt the method identical with embodiment 1 to carry out, difference is: step 1) add the H of 600ml mass percentage 80wt% 2 SO 4 solution, and reacted at 190°C for 1 hour. Step 2) washing with deionized water until the pH of the filtrate is 2.0.

Embodiment 3

[0124] Adopt the method identical with embodiment 1 to carry out, difference is: step 1) add the H of 400ml mass percent 70wt% 2 SO 4 solution, and reacted at 200°C for 5 hours. Step 2) washing with deionized water until the pH of the filtrate is 2.5.

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Abstract

The invention relates to the field of waste resource utilization, and discloses a method for preparing a denitration catalyst from a waste denitration catalyst. The method comprises the following steps: (1) pretreating the waste denitration catalyst; (2) mixing the product with acid liquor, and conducting reacting and filtering to obtain filtrate and filter residues; (3) washing, filtering and drying the filter residues to obtain powder containing vanadium, tungsten and titanium; (4) carrying out extraction treatment on the filtrate to obtain a mixed solution containing vanadium and tungsten;(5) mixing the powder containing vanadium, tungsten and titanium with the mixed solution containing vanadium and tungsten, a binder, a lubricant, a pore-forming agent, a surfactant, a structural aid and water to obtain a mixture; and (6) aging the mixture, and conducting filtering, molding, drying and roasting to obtain the denitration catalyst. The method has the advantages of simple process flow, less secondary pollution and low cost, and the prepared denitration catalyst has excellent catalytic performance and can meet the requirements of actual production.

Description

technical field [0001] The invention relates to the field of resource utilization of hazardous waste, in particular to a method for preparing a denitration catalyst from a waste denitration catalyst and a denitration catalyst prepared by the method. Background technique [0002] my country mainly uses coal as the main energy structure, and emits a large amount of nitrogen oxides (NO x ), is one of the main air pollutants, and the realization of thermal power denitrification industry will become the only way for the environmental protection industry. [0003] Currently, the most effective denitrification technology is selective catalytic reduction (SCR). SCR denitrification technology has the advantages of high efficiency, good selectivity, and mature technology, and is widely used in thermal power plants. The raw materials of SCR catalyst include out-of-market titanium dioxide, tungsten trioxide, vanadium pentoxide, etc., among which denitrification titanium dioxide accoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/06B01J37/08B01D53/86B01D53/56
CPCB01J23/30B01J37/06B01J37/0018B01D53/8628B01D2258/0283
Inventor 何发泉王宝冬刘子林林德海马少丹曹子雄张珑慧熊日华
Owner CHNA ENERGY INVESTMENT CORP LTD
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