Preparation method of denitration catalyst

A denitration catalyst and chelating agent technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as hazards, acid corrosion of catalyst active components, and influence on the adsorption and activation of reactant molecules on the catalyst surface. Achieve the effect of wide catalytic activity temperature window, excellent resistance to alkali metal poisoning, and excellent catalytic activity

Pending Publication Date: 2022-03-18
HAINAN UNIVERSITY
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Problems solved by technology

However, the strong acid impregnation method may lead to acid erosion and shedding of the active components of the catalyst, affecting the adsorption and activation of reactant molecules on the catalyst surface, and in the actual production process, acid storage and transportation, cleaning after impregnation, and surface acid residues have a negative impact on the environment. hazards cannot be ignored

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  • Preparation method of denitration catalyst

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preparation example Construction

[0022] In view of the problem in the prior art that denitrification catalysts are prone to alkali metal poisoning and deactivation, this application provides a preparation method for denitrification catalysts, which uses a precursor salt containing sulfate groups for the first time to provide sulfate groups in the catalyst. The acidic sites are generated in situ on the surface, and they preferentially combine with the sulfuric acid sites when the alkali metal is poisoned, thereby protecting the original active components and acidic adsorption sites, and avoiding the problem of acid storage, transportation and cleaning in the production process, and solving the problem of Contamination of surface acid residues after catalyst production. Specifically, the embodiment of the present invention discloses a preparation method of a denitration catalyst, comprising the following steps:

[0023] A) dissolving titanium salt and cerium salt in deionized water to obtain a mixed solution; ...

Embodiment 1

[0032] (1) Catalyst preparation: Weigh titanium sulfate, cerium nitrate and citric acid in a molar ratio of 0.9:0.1:2; first dissolve the cerium nitrate and titanium sulfate in deionized water. After dissolving evenly, add an appropriate amount of acetic acid dropwise to the mixed solution to adjust the pH to 2; then, add citric acid and mix evenly at room temperature; then keep stirring the mixed solution at a constant temperature of 80°C for 8 hours until a sol is formed; The sol was dried at 120°C for 12 hours to obtain a xerogel; after drying, the product was calcined at 450°C for 5 hours, and after cooling, the high-efficiency alkali-resistant denitrification catalyst of the present invention could be obtained.

[0033] (2) Denitrification performance test: Weigh an appropriate amount of catalyst powder prepared above and press it into tablets, sieve it on a 20-mesh to 40-mesh sieve, and put the sieved sample into a catalytic reactor for testing; during the test, 500ppmNO,...

Embodiment 2

[0041] (1) Catalyst preparation: Weigh titanium tetrachloride, cerium sulfate and citric acid in a molar ratio of 0.8:0.2:1.2; first dissolve cerium nitrate and titanium sulfate in deionized water, and after the dissolution is uniform, drop Add an appropriate amount of acetic acid to adjust the pH to 5; then, add citric acid and mix well at room temperature; then keep stirring the mixed solution at a constant temperature of 90°C for 10 hours to form a sol; dry the obtained sol at 100°C for 24 hours to obtain Dry gel; after drying, the product is calcined at 500°C for 2 hours, and after cooling, the high-efficiency alkali-resistant denitrification catalyst of the present invention can be obtained.

[0042] (2) Denitrification performance test: the same as in Example 1.

[0043] (3) Preparation of poisoned catalyst: same as in Example 1.

[0044] (4) Alkali resistance test: same as in Example 1.

[0045] Table 2 The denitrification activity of the catalyst prepared in Example ...

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Abstract

The invention provides a preparation method of a denitration catalyst, which comprises the following steps: A) dissolving a titanium salt and a cerium salt in deionized water to obtain a mixed solution; b) adjusting the acidity of the mixed solution, adding a chelating agent, reacting, and drying and aging; and C) calcining and activating the product obtained in the step B) to obtain the denitration catalyst. The preparation method of the denitration catalyst provided by the invention is simple and efficient, the obtained catalyst generates an acidic site on the surface in situ by utilizing a sulfate group contained in the precursor salt, and the acidic site is preferentially combined with alkali metal ions, so that the surface active component is protected, and the alkali-resistant effect is achieved; and the catalyst has excellent catalytic activity, a wide catalytic activity temperature window and excellent alkali metal poisoning resistance.

Description

technical field [0001] The invention relates to the field of air pollution control technology and nitrogen oxide purification technology in environmental protection, in particular to a preparation method of a denitrification catalyst. Background technique [0002] Nitrogen oxides, as one of the main air pollutants, will cause serious environmental problems and cause serious harm to human, animal and plant health. At present, in order to control nitrogen oxides in the atmosphere, the selective catalytic reduction method is widely used, and a variety of denitrification catalysts have been developed at home and abroad. However, under actual working conditions, the flue gas contains not only nitrogen oxides, but also many toxic substances, which will poison the catalyst and deactivate it. The flue gas emitted by waste incinerators, coal-fired power plants and cement kilns and other places that use fossils and biomass as fuel contains a large amount of alkali metals. Alkali met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/56
CPCB01J23/10B01J23/002B01D53/8628
Inventor 李长久蔡思翔
Owner HAINAN UNIVERSITY
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