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Loaded tourmaline rare earth compound selective denitration catalyst

A denitrification catalyst and rare earth composite technology, which is applied in the field of selective denitration catalyst and its preparation, can solve the problems of not being able to meet the low temperature wide denitrification activity window, high selectivity and high water resistance and sulfur resistance, and achieve environmental protection, The effect of reducing energy consumption and cost, and reducing production cost

Inactive Publication Date: 2017-07-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a loaded tourmaline rare earth composite selective denitrification catalyst for the problems that the existing catalyst system cannot meet the low temperature wide denitrification activity window, high selectivity requirements, high water resistance and sulfur resistance performance in the actual denitrification process.

Method used

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  • Loaded tourmaline rare earth compound selective denitration catalyst
  • Loaded tourmaline rare earth compound selective denitration catalyst
  • Loaded tourmaline rare earth compound selective denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 23.24 mL of manganese nitrate solution with a mass fraction of 50%, cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) 4.3414g and samarium nitrate hexahydrate (Sm(NO 3 ) 3 ·6H 2 O) 4.4467g was dissolved in 176.76mL deionized water to obtain a mixed solution, so that the molar ratio of Mn:Ce:Sm was 10:1:1, and the solution was mixed uniformly by continuous mechanical stirring at room temperature for 1h; then 0.4991g of the average particle Diameter is 65nm, iron content is 15.5wt.% iron tourmaline to add wherein, make it account for 1.0% of material gross mass, (the described material is manganese salt, cerium salt, samarium salt, tourmaline and carrier SBA-15. ) mechanically stirred for 1h; 22.3375g of SBA-15 carrier was added to the mixed solution, so that the carrier accounted for 45.0% of the total mass of the material, and mechanically stirred for 2h; 4mol / L ammonia solution was slowly added dropwise to the mixed solution at a rate of 2mL / min The solution was st...

Embodiment 2

[0042] 23.24mL of 50% manganese nitrate solution, 4.3414g of cerium nitrate and 4.4467g of samarium nitrate were dissolved in 176.76mL of deionized water to obtain a mixed solution, so that the molar ratio of Mn:Ce:Sm was 10:1:1, and continuously Stir mechanically for 1 hour to make the solution evenly mixed; then add 0.0624g ferrite tourmaline to make it account for 0.1% of the total mass of the material, and stir mechanically for 1 hour; add 22.2707g SBA-15 carrier to the mixed solution to make the carrier account for the total mass of the material 45.9% of the mass, mechanically stirred for 2h; 4mol / L ammonia solution was slowly added dropwise to the mixed solution at a rate of 2mL / min until the pH of the solution = 12, and mechanically stirred for 2h; stood for 24h to separate layers, and removed the supernatant , Transfer the precipitate to a hydrothermal kettle for 24 hours at 180°C. Suction filter and wash the hydrothermal product, put the filter cake in a drying box an...

Embodiment 3

[0044] Steps are as in Example 1, other conditions remain unchanged, change 50% manganese nitrate solution to 7.44mL, deionized water to 192.56mL, make the molar ratio of Mn:Ce:Sm be 3.2:1:1; tourmaline quality is 0.2999g , accounting for 1.0% of the total mass of the material; the mass of SBA-15 is 12.4770g, accounting for 45.0% of the total mass of the material. Catalyst C is prepared.

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Abstract

The invention relates to a loaded tourmaline rare earth compound selective denitration catalyst which comprises a carrier, an auxiliary agent and an active ingredient. The carrier is SBA-15, the auxiliary agent is tourmaline and the active ingredient is manganese-cerium-samarium compound oxide; the catalyst comprises the following components based on 100% of total mass of the materials of the catalyst: 36.0-54.0% of the active ingredient, 0.1-1.0% of tourmaline and the balance of an SBA-15 carrier. The waterproof sulfur-resisting property of the catalyst is improved by means of rare earth elements such as cerium and samarium; the activity of the catalyst is improved by means of excellent physical and chemical properties of far infrared radiation and spontaneous polarization of the tourmaline; the dispersibility of the active ingredient of the catalyst is improved by means of the SBA-15 carrier and the contact area of the catalyst and smoke is enlarged, and a catalytic reaction is performed better.

Description

technical field [0001] The invention relates to a selective denitrification catalyst and a preparation method thereof, in particular to a loaded tourmaline rare earth composite low-temperature selective denitrification catalyst with high water and sulfur resistance for selective removal of nitrogen oxides. It is used in the fields of flue gas low-temperature denitrification technology and environmental protection. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmospheric environment and one of the main sources of acid rain. It will also destroy the ozone layer. When the concentration is too high, it can even cause photochemical smog pollution, which is harmful to human health and the ecological environment. Studies have shown that HNO 3 The contribution to acid rain is showing an increasing trend year by year, and NO 3 - / SO 4 2- The ratio of nitrogen oxides is gradually increasing. In recent years, with the strengthening of...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01D53/86B01D53/56
CPCB01J29/0341B01D53/8628B01D2258/0283B01J2229/18B01J2229/32
Inventor 薛刚李家昂梁金生李苗苗桂鹏
Owner HEBEI UNIV OF TECH
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