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

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, ...

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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

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