Integral composite oxide low-temperature SCR catalyst and preparation method thereof

A composite oxide, monolithic technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems that do not involve the preparation and performance of monolithic catalysts, difficult to control, complicated operation process, etc. Excellent resistance to SO2 and water vapor, reducing mass and volume, and promoting the effect of SCR reaction

Inactive Publication Date: 2020-04-17
QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working condition of CN107649121A discloses a modification method of manganese-based denitrification catalyst, which adopts plasma modification to prepare Mn-based SCR catalyst, but has the disadvantages of high equipment cost, difficult control, complicated operation process and low output, and it is difficult to realize large-scale production
The catalyst has low strength, poor toughness, and large specificity. In addition, granular catalysts have disadvantages such as large resistance, uneven air distribution, and easy clogging during use.
Patent CN109954514A discloses a catalyst for molecular sieve-loaded modified Mn-based oxides for diesel vehicle exhaust denitrification, with Mn as the active component, CeO 2 As an active auxiliary agent, the denitrification efficiency of the catalyst powder at 120-250°C is over 85%, but the performance of the catalyst is evaluated by the powder model, which does not involve the preparation and performance of the monolithic catalyst, and there is still a long way to go before industrial scale-up production and application

Method used

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  • Integral composite oxide low-temperature SCR catalyst and preparation method thereof
  • Integral composite oxide low-temperature SCR catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A monolithic composite oxide low-temperature SCR catalytic module, prepared by the following method:

[0040] S1. Vector preparation

[0041] Composite the corrugated fiberglass base material with the flat glass fiber base material and process it into a carrier module.

[0042] S2, catalyst active powder

[0043] S21, dissolving 10 parts of Mn and 1 part of Fe precursor into 80 parts of deionized water, stirring until completely dissolved, to obtain an active solution;

[0044] S22. Add 100 parts of ZSM-5 molecular sieves to the active solution in S21, stir ultrasonically for 4 hours, dry at 100° C., and calcinate at 550° C. for 4 hours in an air atmosphere to obtain an active powder.

[0045] S3, catalyst coating

[0046] S31. Mix 10 parts of silica sol, 0.2 parts of glycerin and 80 parts of deionized water, then add 100 parts of active powder, stir, and ball mill for 60 minutes to obtain a coating slurry.

[0047] S32. Put the monolithic carrier in the coating slu...

Embodiment 2

[0050] A monolithic composite oxide low-temperature SCR catalytic module, prepared by the following method:

[0051] S1. Vector preparation

[0052] Composite the corrugated fiberglass base material with the flat glass fiber base material and process it into a carrier module.

[0053] S2, catalyst active powder

[0054] S21, dissolving 15 parts of Mn and 3 parts of Cu precursors into 90 parts of deionized water, stirring until completely dissolved, to obtain an active solution;

[0055]S22. Add 100 parts of CHA molecular sieves to the active solution of S21, stir ultrasonically for 4 hours, dry at 120° C., and calcinate at 550° C. for 6 hours in an air atmosphere to obtain an active powder.

[0056] S3, catalyst coating

[0057] S31. Mix 20 parts of aluminum sol, 4 parts of ammonium dodecylbenzenesulfonate and 75 parts of deionized water, then add 100 parts of active powder, stir, and ball mill for 30 minutes to obtain a coating slurry.

[0058] S32. Put the monolithic car...

Embodiment 3

[0061] A monolithic composite oxide low-temperature SCR catalytic module, prepared by the following method:

[0062] S1. Vector preparation

[0063] Composite the corrugated fiberglass base material with the flat glass fiber base material and process it into a carrier module.

[0064] S2, catalyst active powder

[0065] S21, dissolving 10 parts of Mn and 1 part of Ce precursor into 80 parts of deionized water, stirring until completely dissolved, to obtain an active solution;

[0066] S22. Add 100 parts of BEA molecular sieves to the active solution of S21, perform ion exchange at 70° C. for 4 hours, dry at 80° C., and calcinate at 450° C. for 6 hours in an air atmosphere to obtain an active powder.

[0067] S3, catalyst coating

[0068] S31. Mix 18 parts of silica sol, 1.0 part of polyethylene glycol, 0.3 part of glycerin and 85 parts of deionized water, then add 100 parts of active powder, stir, and ball mill for 120 minutes to obtain a coating slurry.

[0069] S32. Put ...

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Abstract

The invention provides an integral composite oxide low-temperature SCR catalyst and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a carrier; S2, preparing catalyst active powder: S21: dissolving a manganese-containing active component and an active auxiliary agent precursor into deionized water to obtain an active solution, S22, adding molecularsieve powder into an active solution obtained in the S21, and performing ultrasonic stirring, drying and roasting to obtain the active powder; S3, coating with a catalyst: S31, dispersing the active powder prepared in the step S22 into deionized water, stirring, adding a binder and an auxiliary agent, mixing and stirring, and carrying out ball milling to obtain coating slurry; and S32, putting theintegral carrier prepared in the step S1 into coating slurry, performing vacuum coating, and performing compressed air purging to obtain an integral composite oxide low-temperature SCR catalytic module.

Description

technical field [0001] The invention relates to the field of environmental functional materials, in particular to an integral composite oxide low-temperature SCR catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are important air pollutants, mainly including nitric oxide (NO) and nitrogen dioxide (NO 2 ). In addition to causing harm to the human body, NOx can also cause environmental problems such as photochemical smog, acid rain, and ozone layer destruction through a series of physical and chemical reactions. Therefore, the control of NOx is imminent. The most effective and widely used technology for NOx emission control and elimination is selective catalytic reduction (SCR) technology. The SCR process can be divided into three types: high dust, low dust and tail. The tail SCR reactor is arranged after the desulfurization and dust removal equipment. The flue gas is cleaner, but the temperature is lower (100-200°C). Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01J29/48B01J29/16B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01J29/166B01J29/48B01J29/7815B01J29/783B01J2229/186
Inventor 李晨灿展宗城梁鹏郭聪杨艳林展飞柴灵芝郅立鹏陈继朝
Owner QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD
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