CN-121988340-A - Preparation method, product and application of medium-low temperature poisoning-resistant Mn-based catalyst

Abstract

The invention relates to the technical field of waste recycling, in particular to a preparation method, a product and application of a medium-low temperature poisoning-resistant Mn-based catalyst. The preparation method of the medium-low temperature poisoning-resistant Mn-based catalyst comprises the steps of dissolving precursor substances respectively containing A, mn and Al in water to obtain a homogeneous solution, controlling the pH value of a reaction system to be alkaline, aging, carrying out suction filtration and washing on the aged mixed solution, drying and calcining to obtain the medium-low temperature poisoning-resistant Mn-based catalyst, wherein A is one of Cu, ni and Co. The medium-low temperature poisoning-resistant Mn-based catalyst prepared by the method can efficiently catalyze and reduce nitrogen oxides and chlorobenzene in flue gas generated when pesticides are destroyed at medium-low temperature, and has good medium-low temperature compound poisoning resistance.

Inventors

• YAN QINGHUA
• ZHAO JIARONG
• SONG XIAOZHE
• LIU GUOCHENG
• XIN YANJUN

Assignees

• 青岛农业大学

Dates

Publication Date

20260508

Application Date

20260128

Claims (10)

1. 1. The preparation method of the medium-low temperature poisoning-resistant Mn-based catalyst is characterized by comprising the following steps of: step 1, dissolving precursor substances respectively containing A, mn and Al in water to obtain a homogeneous solution; step 2, adding the homogeneous solution into a source solution, controlling the pH value of a reaction system to be alkaline, and aging; Step 3, carrying out suction filtration and washing on the aged mixed solution, and then drying to obtain a hydrotalcite-like compound/red mud composite material containing A, al and Mn; step 4, calcining the hydrotalcite-like compound/red mud composite material containing A, al and Mn to obtain the medium-low temperature poisoning-resistant Mn-based catalyst; the A is at least one of Cu, ni and Co; the source solution is a solution containing red mud and Na 2 CO 3 .
2. 2. The method for preparing the medium-low temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein the molar ratio of A to Mn to Al is (0.5-2): 1.
3. 3. The method for preparing the medium-low temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein the dosage ratio of the A to the red mud is 0.025mol (0.5-2) g.
4. 4. The preparation method of the medium-low temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein the mass ratio of red mud to Na 2 CO 3 in the source solution is 1 (5-6).
5. 5. The method for preparing a low-and-medium temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein in the step 2, the pH of the reaction system is controlled to be 8-12.
6. 6. The method for preparing the medium-low temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein the aging is performed at room temperature under the condition of isolating air from nitrogen exposure, and the aging time is 10-12 hours.
7. 7. The method for preparing a medium-low temperature poisoning-resistant Mn-based catalyst according to claim 1, wherein the calcination is specifically performed at 350-600 ℃ for 4-5 hours.
8. 8. A medium-low temperature poisoning-resistant Mn-based catalyst prepared by the preparation method according to any one of claims 1 to 7.
9. 9. The medium-low temperature poisoning-resistant Mn-based catalyst according to claim 8, wherein the chemical composition of the medium-low temperature poisoning-resistant Mn-based catalyst is A w Mn x Al y O z /red mud, wherein A is at least one of Cu, ni and Co, w, x and y are respectively the mole fractions of A, mn and Al, w and x are 0.5-2, y is 1, and w/y is 1/2-2/1, and x/y is 1/2-2/1.
10. 10. Use of a medium-low temperature poisoning resistant Mn-based catalyst according to claim 8 or 9 for the synergistic removal of chlorobenzene and NOx from industrial fumes.

Description

Preparation method, product and application of medium-low temperature poisoning-resistant Mn-based catalyst Technical Field The invention relates to the technical field of waste recycling, in particular to a preparation method, a product and application of a medium-low temperature poisoning-resistant Mn-based catalyst. Background The red mud is industrial solid waste generated after the bauxite is used for preparing aluminum oxide or aluminum hydroxide, and the alkaline smelting is adopted in the production process, so that the red mud is strongly alkaline, and the pH value is generally 10-14. It is counted that about 1.0-1.5 tons of red mud is produced per 1 ton of alumina produced. At present, red mud is mainly piled in open air, and long-term piled in open air can cause extremely high environmental risks to soil and underground water due to high alkalinity, high yield and complex pollutant types, and most red mud yards face the problem of reservoir capacity saturation. Therefore, how to realize the reduction and resource utilization of the red mud becomes a key place for sustainable development of the alumina industry and prevention and treatment of pollution of solid wastes in bulk industry. Nitrogen oxides (NO x) and chlorine-Containing Volatile Organic Compounds (CVOCs) are typical pollutants in industrial incineration processes of pesticide packaging waste, medical waste and the like, and are key precursors for forming environmental problems such as PM 2.5, ozone and the like. CVOCs is low in most practical emission scenes, and the economy is poor by arranging a separate control technology, and implementing the cooperative control of NO x and CVOCs is a very important ring for developing a multi-pollutant cooperative control technology. the synergistic catalytic treatment technology can simultaneously realize the efficient removal of multiple pollutants, and is a hot spot technology in the field of current atmospheric pollution treatment. A Selective Catalytic Reduction (SCR) method has become a mainstream technology for NO x emission Reduction in the fields of coal-fired flue gas and diesel vehicle exhaust gas control. The catalytic oxidation (CATALYTIC OXIDATION, CO) method is widely applied to VOCs terminal treatment due to the characteristics of high efficiency, low energy consumption and the like. The key problems of the NO x and CVOCs synergistic catalysis technology still need to be solved, namely, ① synergistic purification activity is low, a reaction matching temperature window of the two is narrow, ② is easy to generate polychlorinated byproducts, target product N 2/HCl/CO2 is low in selectivity, ③ is poor in poisoning resistance and is easy to suffer from C1 ∙ deposition and smoke impurity components (water vapor, SO 2, heavy metal, etc.), the compound poisoning influence of the catalyst surface acidity is reduced, metal sulfate/ammonium bisulfate, chloride, etc. are formed to deposit, the exposed active sites on the catalyst surface are covered, the activation of molecules such as NO x、NH3, CVOCs, etc. is lost, and the catalyst poisoning phenomenon is aggravated. Therefore, aiming at the bottleneck problems of high alkalinity and complex pollution types of red mud wastes, which limit the resource utilization of the red mud wastes, the development of the red mud high-valued product for the NO x and CVOCs synergistic catalytic purification technology in industrial incineration flue gas has important significance for the cyclic economic development and ecological environment protection of the alumina industry. Disclosure of Invention Based on the above, the invention provides a preparation method, a product and application of a medium-low temperature poisoning-resistant Mn-based catalyst. In order to achieve the above object, the present invention provides the following solutions: According to one of the technical schemes, the preparation method of the medium-low temperature poisoning-resistant Mn-based catalyst comprises the following steps: step 1, dissolving precursor substances respectively containing A, mn and Al in water to obtain a homogeneous solution; step 2, adding the homogeneous solution into a source solution, controlling the pH value of a reaction system to be alkaline, and aging; Step 3, carrying out suction filtration and washing on the aged mixed solution, and then drying to obtain a hydrotalcite-like compound/red mud composite material containing A, al and Mn; step 4, calcining the hydrotalcite-like compound/red mud composite material containing A, al and Mn to obtain the medium-low temperature poisoning-resistant Mn-based catalyst; the A is at least one of Cu, ni and Co; the source solution is a solution containing red mud and Na 2CO3. According to the second technical scheme, the medium-low temperature poisoning-resistant Mn-based catalyst prepared by the preparation method is provided. According to the third technical scheme, the application of the medium-low tem