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A kind of manganese cerium ruthenium composite oxide catalyst and its preparation method and application

A technology of ruthenium composite oxide and cerium oxide, which is applied in the field of resources and environment, can solve the problems of narrow use range, high catalyst cost, and long preparation process, and achieve good uniformity, high catalyst activity, and avoid uneven distribution Effect

Active Publication Date: 2021-01-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the catalyst provided by the above scheme has problems such as high cost, relatively narrow application range, and long preparation process.

Method used

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  • A kind of manganese cerium ruthenium composite oxide catalyst and its preparation method and application
  • A kind of manganese cerium ruthenium composite oxide catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A kind of preparation method of manganese cerium ruthenium composite oxide catalyst, its specific method is:

[0076] (1) KMnO4 and Ce(NO 3 ) 3 ·6H 2 O dissolved in water to form a mixed solution (KMnO 4 The concentration is 20g / L, KMnO 4 and Ce(NO 3 ) 3 The molar ratio is 3:1), under stirring, in the mixed solution, it is 2% H that the mass concentration is added dropwise 2 o 2 (with KMnO 4 The molar ratio is 4.5:1), and then 0.1mol / L NaOH solution was used to adjust the pH for precipitation. The mixture was filtered, washed, dried and then calcined at 500°C in air for 6h to obtain manganese-cerium oxide.

[0077] (2) To 40mg / L RuCl 3 Add PVA (the weight average molecular weight is 8000-10000g / mol, and the mass ratio of ruthenium element is 2:1) to the solution, after it is completely dissolved, quickly add 0.1mol / L NaBH under stirring 4 Solution (the molar ratio of ruthenium element is 5:1), then add manganese-cerium oxide (mass ratio of ruthenium element is...

Embodiment 2

[0081] This example is the same as Example 1 except that the molar ratio of manganese and cerium in the active component manganese-cerium oxide is 1:4.

[0082] The manganese-cerium-ruthenium composite oxide catalyst prepared in this example is composed of manganese-cerium oxide and ruthenium oxide dispersed on the surface of the manganese-cerium oxide, the active component is manganese-cerium oxide, and the auxiliary agent is ruthenium Oxide, the molar ratio of manganese and cerium in the active component is 1:4, the mass fraction of ruthenium oxide (calculated as ruthenium) is about 1%, and the particle size of ruthenium oxide is 3-10nm.

[0083] Performance evaluation was performed on the manganese-cerium-ruthenium composite oxide catalyst prepared in this example, and the results obtained are shown in Table 1.

Embodiment 3

[0085] This example is the same as Example 1 except that the molar ratio of manganese and cerium in the active component manganese-cerium oxide is 9:1.

[0086] The manganese-cerium-ruthenium composite oxide catalyst prepared in this example is composed of manganese-cerium oxide and ruthenium oxide dispersed on the surface of the manganese-cerium oxide, the active component is manganese-cerium oxide, and the auxiliary agent is ruthenium For the oxide, the molar ratio of manganese and cerium in the active component is 9:1, the mass fraction of the additive ruthenium oxide (calculated as ruthenium) is 1%, and the particle size of the ruthenium oxide is 3-10nm.

[0087] Performance evaluation was performed on the manganese-cerium-ruthenium composite oxide catalyst prepared in this example, and the results obtained are shown in Table 1.

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Abstract

The invention provides a manganese-cerium-ruthenium composite oxide catalyst and its preparation method and use. The manganese-cerium-ruthenium composite oxide catalyst includes manganese-cerium oxide and ruthenium oxide dispersed on the surface of the manganese-cerium oxide. The preparation method includes: (1) using a redox-hydrolysis coprecipitation method to prepare manganese-cerium oxide; (2) using a sol-deposition method to prepare a dispersion of ruthenium nanoparticles, and dispersing the ruthenium nanoparticles in step ( 1) The surface of the manganese-cerium oxide is used to obtain the ruthenium-containing manganese-cerium oxide. The ruthenium-containing manganese-cerium oxide is roasted to obtain the manganese-cerium-ruthenium composite oxide catalyst. The manganese-cerium-ruthenium composite oxide catalyst provided by the invention has low catalyst cost, a low temperature for complete oxidation of common VOCs, excellent resistance to chlorine poisoning, and stable activity during the catalytic oxidation of CVOCs in a lower temperature range.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a manganese-cerium-ruthenium composite oxide catalyst and its preparation method and application. Background technique [0002] Volatile organic compounds (volatile organic compounds, referred to as VOCs) are PM 2.5 and O 3 The important precursors of VOCs can cause atmospheric environmental problems such as smog and photochemical smog. The human body is exposed to excessive VOCs for a long time, which will damage the health of the liver, kidneys and nervous system. Decompose VOCs into CO at 150-500°C by catalytic oxidation 2 and H 2 Small molecular substances such as O can completely eliminate VOCs pollution, and are suitable for VOCs mixed waste gas that has no recycling value. [0003] Efficient and stable catalysts are the key to the application of catalytic oxidation. At present, the catalytic oxidation of VOCs mainly uses expensive platinu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/656B01J35/02B01D53/86B01D53/72B01J35/00
CPCB01D53/8668B01J23/002B01J23/6562B01D2257/708B01J2523/00B01J35/40B01J2523/3712B01J2523/72B01J2523/821
Inventor 朱廷钰王健赵海楠徐文青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI