Manganese-cerium composite oxide catalyst for removing medium-low concentration benzene series in air and preparation method thereof

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low concentration of manganese oxides on the surface, incomplete oxidation, Rapid deactivation and other issues, to achieve uniform distribution, good support and dispersion, and good stability

Inactive Publication Date: 2011-10-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some literatures reported that manganese was loaded on γ-Al by impregnation method. 2 o 3 The catalyst catalyzes ozone to oxidize benzene series, but there are still problems such as low concentration of manganese oxide on the surface, incomplete oxidation, rapid deactivation, and high energy consumption.

Method used

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  • Manganese-cerium composite oxide catalyst for removing medium-low concentration benzene series in air and preparation method thereof
  • Manganese-cerium composite oxide catalyst for removing medium-low concentration benzene series in air and preparation method thereof
  • Manganese-cerium composite oxide catalyst for removing medium-low concentration benzene series in air and preparation method thereof

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[0024] The invention provides a manganese-cerium composite oxide catalyst for removing low-concentration benzene series in the air and a preparation method thereof. The process flow of the preparation method is as follows image 3 As shown, it is specifically prepared by the following steps:

[0025] The first step is to configure the mixture. Al(NO 3 ) 3 , Mn(NO 3 ) 2 and Ce(NO 3 ) 3 The solution is mixed according to the ratio of the Mn / Al atomic ratio of 1:110 to 3:11 and the Mn / Ce atomic ratio of 1:10 to 10:1 to obtain a mixed solution;

[0026] The second step is to prepare an ammonia solution and prepare a precipitate. Prepare NH with a mass fraction of 20% to 30% 3 ·H 2 O solution, and the mixed solution obtained in the first step was added dropwise to NH at a constant rate (1-3 drops / second). 3 ·H 2 O solution (pH titration end point is 8-9), keep stirring at a constant speed during the dropwise addition process to obtain a precipitate.

[0027] The third s...

Embodiment 1

[0032] Catalyst preparation: Al(NO with a concentration of 0.5mol / L 3 ) 3, 0.5mol / L Mn(NO 3 ) 2 and 0.5mol / L Ce(NO 3 ) 3 Fully mix according to the ratio of Mn / Al atomic ratio of 1:11 and Mn / Ce atomic ratio of 5:1 to obtain a mixed solution; prepare a mass percent concentration of 20% NH 3 ·H 2 O solution, and the aforementioned mixed solution was added dropwise to NH at a constant rate (1 drop / second) 3 ·H 2 In O solution (pH titration end point is 8.0), the dropwise addition process keeps stirring at a constant speed, and a precipitate is obtained. After the precipitation is complete, age the precipitate in a water bath at 50°C for 2 hours, then filter the precipitate with suction, wash with deionized water for 3 times, dry at 100°C for 10 hours, and roast in a muffle furnace at 300°C for 3 hours to grind the obtained sample and sieved to 40-60 mesh to obtain the manganese-cerium composite oxide catalyst.

[0033] Perform a performance test on the catalyst obtained ...

Embodiment 2

[0035] Catalyst preparation: Al(NO with a concentration of 1.0mol / L 3 ) 3 , 0.5mol / L Mn(NO 3 ) 2 and 0.1mol / L Ce(NO 3 ) 3 Fully mix according to the ratio of Mn / Al atomic ratio of 3:11 and Mn / Ce atomic ratio of 1:5 to obtain a mixed solution; prepare NH with a mass percentage concentration of 30%. 3 ·H 2 O solution, and the aforementioned mixed solution was added dropwise to NH at a constant rate (2 drops / sec) 3 ·H 2 O solution (pH titration end point is 8.3), keep constant stirring during the dropwise addition process, and precipitates are constantly precipitated; after the precipitation is complete, age the precipitates in a 50°C water bath for 3 hours, then filter the precipitates with suction, and wash them with deionized water for 4 hours. Next, dry at 110° C. for 11 h, bake in a muffle furnace at 400° C. for 4 h, grind the obtained sample and sieve it to 40-60 meshes to obtain the manganese-cerium composite oxide catalyst of the present invention.

[0036] Cataly...

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Abstract

The invention discloses a manganese-cerium composite oxide catalyst for removing medium-low concentration benzene series and a preparation method thereof, which belong to the technical field of purification and treatment of gases. The preparation method comprises the following steps of: mixing solutions of Al (NO)3, Mn (NO3) and Ce (NO3)3 according to a proportion, and dropping a mixture liquid to a NH3.H2O solution so as to obtain a precipitate; ageing the obtained precipitate in water bath, then leaching the precipitate, washing with deionized water, drying and then roasting in a muffle furnace; and grinding and sieving the roasted precipitate so as to obtain the manganese-cerium composite oxide catalyst. The catalyst provided by the invention is simple to prepare, is suitable for large-scale production and has the advantages of large specific surface area and good absorbability to the benzene series; the service life of the catalyst can be prolonged through a stage type reaction; the catalyst has the advantages of uniformly distributed active components, good decomposability to the benzene series and ozone as well as capability of adapting to the benzene series of various different initial concentrations, mild reaction conditions, good stability and higher practical value.

Description

technical field [0001] The invention relates to a manganese-cerium composite oxide catalyst that catalyzes the decomposition of ozone and oxidizes benzene series at room temperature and a preparation method thereof, belonging to the technical field of gas purification treatment. Background technique [0002] Benzene series is a common indoor air pollutant, which usually includes three types of benzene, toluene, and xylene, among which benzene and toluene have been listed as priority pollutants by the list of atmospheric toxic pollutants formulated by the US Environmental Protection Agency (USEPA) . The health effects of benzene series are manifested in three aspects: blood toxicity, genotoxicity and carcinogenicity. Benzene can be absorbed through the respiratory tract and skin. Long-term exposure to benzene will cause aplastic anemia, various dermatitis, rash, skin Mucosal hemorrhage can even lead to leukemia, and benzene can also cause fetal birth defects; toluene is less...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/10B01D53/90B01D53/72
Inventor 朱天乐吴从佳马婵娟
Owner BEIHANG UNIV
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