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Combined catalyst and method for treating nitrogen-containing volatile organic compound pollutants

A technology of volatile organic and combined catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, molecular sieve catalysts, etc., to achieve good stability

Pending Publication Date: 2021-07-30
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, although the development of synergistic catalytic purification technology for NVOCs compound pollutants has important practical significance, there are no reports on methods and catalysts that are generally applicable to the synergistic catalytic purification of NVOCs compound pollutants.

Method used

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  • Combined catalyst and method for treating nitrogen-containing volatile organic compound pollutants
  • Combined catalyst and method for treating nitrogen-containing volatile organic compound pollutants
  • Combined catalyst and method for treating nitrogen-containing volatile organic compound pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 2 The selective oxidation-total oxidation integrated reaction device shown includes a fixed bed reactor 4, a catalyst bed I5 and a catalyst bed II6; inside the cavity.

[0032] The device also includes an air inlet pipeline 1, a fan 2 and a pipeline I3; the fan 2 communicates with the inlet pipeline 1 and the pipeline I3 respectively, and further, the pipeline I3 communicates with the fixed bed reactor 4.

[0033] The device also includes a pipeline II7, a one-way valve 8 and an exhaust pipeline 9; the one-way valve 8 communicates with the pipeline II7 and the exhaust pipeline 9 respectively, and further, the pipeline II7 is connected to the fixed-bed reactor 4 connected.

[0034] This embodiment is carried out under a specific gas flow direction, and the gas flow direction is: inlet pipeline 1→fan 2→pipeline I3→fixed bed reactor 4→catalyst bed layer I5→catalyst bed layer II6→pipeline II7→one-way valve 8→Exhaust pipeline 9.

Embodiment 2

[0035] Example 2 Cu / ZSM-5 and Pt / MnO 2 Catalyst treatment of DMF and toluene gas

[0036] Preparation of Cu / ZSM-5 and Pt / MnO by Vacuum Impregnation 2 Catalyst, the mass ratio of Cu to carrier is 0.04-0.15:1, SiO of ZSM-5 molecular sieve 2 / Al 2 o 3 The molar ratio is 25; the mass ratio of Pt to carrier is 0.001-0.05:1.

[0037] Catalyst activity evaluation uses the selective oxidation-total oxidation integrated reaction device of Example 1, using 7.5wt.%Cu / ZSM-5 (7.5wt.% refers to the mass ratio of Cu to ZSM-5) as the selective oxidation catalyst, Set in the catalyst bed I described in Example 1; using 1.0wt%Pt / MnO 2 As a complete oxidation catalyst, it is installed in the catalyst bed II described in Example 1.

[0038] Pollutants and products are detected online by GC-7890B gas chromatography and Fourier transform infrared spectroscopic gas analyzer. The pollutants are DMF and toluene gas, the concentration is 500 ppm, the gas flow rate is 200 ml / min, and the space ve...

Embodiment 3

[0040] Example 3 Cu / porous Ce-Zr solid solution support and Pt / MnO 2 Catalyst treatment of DMF and toluene gas

[0041] Catalysts loaded with different amounts of Cu in porous Ce-Zr solid solution were prepared by hydrothermal method, and the molar ratio Cu:Ce:Zr=4-10:80:20. A 0.5-1.0wt.% Pt / MnO2 catalyst was prepared by vacuum impregnation. Using 10wt.%Cu / Ce-Zr solid solution catalyst as selective oxidation catalyst, using Pt / MnO 2 As a complete oxidation catalyst, other activity evaluation conditions were the same as in Example 2.

[0042] Experimental results such as Figure 3-5 As shown, under the air reaction atmosphere, toluene and DMF were completely decomposed at 200 °C, and the nitrogen selectivity was 94% at 250 °C. After the catalyst was operated at 250°C for 100 hours, the activity did not decrease significantly, that is, the catalyst had good stability.

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Abstract

The invention discloses a combined catalyst and a method for treating nitrogen-containing volatile organic compound pollutants, and belongs to the technical field of catalytic combustion environment protection. The Cu and Ag system catalysts of the combined catalyst preferentially selectively oxidize nitrogen-containing components of composite pollutants into nitrogen with stable chemical properties, and then the Pt and Pd noble metal system catalysts completely mineralize residual organic components. The combined catalyst and the method disclosed by the invention are slightly limited by types, concentrations and gas airspeed of pollutants, and are universally suitable for catalytic combustion treatment of nitrogen-containing volatile organic compound pollutants. The catalyst has important significance on organic waste gas purification in industries with typical nitrogen-containing compound pollutant emission characteristics, such as petrochemical industry, coating industry and synthetic leather industry, can stably convert nitrogen-containing volatile organic compound pollutants in waste gas into carbon dioxide, water and nitrogen for a long time, hardly generates nitrogen oxide, and is good in stability.

Description

technical field [0001] The invention relates to the technical field of catalytic combustion environmental protection, in particular to a combined catalyst and method for treating nitrogen-containing volatile organic compound pollutants. Background technique [0002] Volatile Organic Compounds (VOCs) are fine particulate matter (PM 2.5 ) and ozone (O 3 ) is an important precursor for the formation. The emission of VOCs not only causes serious pollution to the atmospheric environment, but most VOCs are toxic, carcinogenic and teratogenic and will cause direct or indirect harm to human health. Nitrogen-containing Volatile Organic Compounds (NVOCs for short), mainly including nitriles, aliphatic amines, alcohol amines, amides, aromatic amines, nitro and other pollutants, are a class of industrial emissions Common organic pollutants are emitted in various industrial processes, such as petrochemical, coating, pharmaceutical, pesticide, synthetic leather and other industries. S...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J23/656B01J23/83B01J29/76B01J23/44B01J29/85B01J23/42B01J37/10B01J37/08B01J37/02F23G7/07
CPCB01J29/46B01J23/6562B01J23/83B01J29/76B01J23/44B01J29/85B01J23/42B01J23/002B01J37/10B01J37/082B01J37/0201B01J37/088F23G7/07B01J2229/186Y02A50/20
Inventor 程杰赵挺郝郑平张中申
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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