Strip manganese-base catalyst for low-temperature denitration of fixing source and preparation method for strip manganese-base catalyst

A strip-shaped manganese-based, low-temperature denitrification technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of human health, ecological environment, High stability, high mechanical strength and good molding effect can be achieved without problems such as increased operating costs

Inactive Publication Date: 2012-12-05
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in practical application of this type of catalyst: First, the optimum catalyst activity temperature is above 350°C, so the catalyst bed must be installed before the desulfurization and dust removal device, and the high concentration of SO in the flue gas 2 and fly ash are easy to poison and block the catalyst, resulting in increased operating costs; and higher operating temperatures are also likely to cause NH 3 Partially oxidized to N 2 O and NO; in addition, the active component V has strong biological toxicity and can have a cumulative effect in the organism, which is easy to damage human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The bar-shaped manganese-based catalyst of this embodiment uses the mixed oxide of Mn and Fe as the active component, and the anatase TiO 2 As carrier; Mn, Fe and TiO in the catalyst 2 The mass ratio of the catalyst is 1.5:0.5:10, and the catalyst is a strip with a cross-sectional diameter of 3 mm.

[0025] The preparation method of the bar-shaped manganese-based catalyst of the present embodiment is:

[0026] Step 1. Preparation of catalyst precursor: Weigh 66.82g of manganese acetate and 36.07g of ferric nitrate, dissolve them in 100mL of water to obtain a transparent mixed solution, and then use the mixed solution to prepare 100g of commercially available industrial grade anatase TiO 2 The powder was impregnated three times, and the impregnated powder was dried by microwave for 10 minutes between two adjacent impregnation treatments, and then the powder after three impregnation treatments was dried at 110°C for 20 hours, and finally dried at a temperature of 500 Ro...

Embodiment 2

[0030] The bar-shaped manganese-based catalyst of this embodiment uses the mixed oxide of Mn and Fe as the active component, and the anatase TiO 2 As carrier; Mn, Fe and TiO in the catalyst 2 The mass ratio of the catalyst is 1:1:10, and the catalyst is a strip with a cross-sectional diameter of 5 mm.

[0031] The preparation method of the bar-shaped manganese-based catalyst of the present embodiment is:

[0032] Step 1. Preparation of catalyst precursor: Weigh 44.55g of manganese acetate and 72.14g of ferric nitrate, dissolve them in 100mL of water to obtain a transparent mixed solution, and then use the mixed solution to prepare 100g of commercially available industrial grade anatase TiO 2 The powder was impregnated five times, and the impregnated powder was dried by microwave for 5 minutes between two adjacent impregnation treatments, and then the powder after five impregnation treatments was dried at 120°C for 12 hours, and finally dried at a temperature of 550°C. Calcin...

Embodiment 3

[0036] The bar-shaped manganese-based catalyst of this embodiment uses the mixed oxide of Mn and Fe as the active component, and the anatase TiO 2 As carrier; Mn, Fe and TiO in the catalyst 2 The mass ratio of the catalyst is 0.5:1.5:10, and the catalyst is a strip with a cross-sectional diameter of 4 mm.

[0037] The preparation method of the bar-shaped manganese-based catalyst of the present embodiment is:

[0038] Step 1. Preparation of catalyst precursor: Weigh 22.73g of manganese nitrate and 108.22g of ferric nitrate, dissolve them in 100mL of water to obtain a transparent mixed solution, and then use the mixed solution to prepare 100g of commercially available industrial grade anatase TiO 2 The powder was impregnated 4 times, and the impregnated powder was dried by microwave for 8 minutes between two adjacent immersion treatments, and then the powder after 4 times of immersion was dried at 100 ° C for 24 hours, and finally dried at a temperature of 400 Roasting for 5h ...

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Abstract

The invention discloses a strip manganese-base catalyst for the low-temperature denitration of a fixing source. According to the strip manganese-base catalyst, a mixed oxide of Mn and Fe is used as an active component, and anatase TiO2 is used as a carrier; a mass ratio of Mn to Fe to TiO2 in the catalyst is (0.5-1.5):(0.5-1.5):10; and the catalyst is a strip of which the diameter of the cross section is 3 to 5 millimeters. In addition, the invention also discloses a method for preparing the strip manganese-base catalyst. According to the method, toxic components V2O5 are not used, so the strip manganese-base catalyst is safe and non-toxic and has high tolerance on high-content H2O (which is 10 volume percent), and the conversion rate of NO is more than 97 percent at the temperature of 230 DEG C; and the strip manganese-base catalyst has high stability in the 150-hour continuous evaluation process, and the conversion rate of NO can be maintained at about 95 percent.

Description

technical field [0001] The invention belongs to the technical field of preparation of low-temperature denitrification catalysts, and in particular relates to a bar-shaped manganese-based catalyst for low-temperature denitrification of fixed sources and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which can cause acid rain, photochemical smog and ozone depletion, and can also participate in the formation of inhalable particulate matter (PM2.5) in the air. Common nitrogen oxides include N 2 O, NO, N 2 o 3 , NO 2 and N 2 o 5 etc. Among them, NO and NO 2 . [0003] Known 90% NO x Emissions come from fuel combustion, and their sources can be divided into stationary and mobile sources. Stationary sources mainly refer to the combustion flue gas of thermal power plants and industrial boilers, which are NO x The main source of emissions; mobile sources are mainly motor vehicle exhaust emissions. Wit...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 李飞孙权侯鑫兰力强
Owner THE NORTHWEST RES INST OF CHEM IND
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