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Preparation of a low-concentration nitrogen monoxide catalyst for elimination of iron, cerium and manganese at room temperature

A technology of iron, cerium and manganese catalysts and nitric oxide, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc.

Active Publication Date: 2017-03-29
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are documents disclosing mesoporous manganese-based composite metal oxides and their preparation methods and uses, using oxalic acid to co-precipitate transition metals (such as Fe, Co, Ni and Zn) and Mn sources to prepare a series of catalysts for the elimination of nitric oxide , its specific surface area is large, and the elimination rate can reach 100%, but it can only maintain about 2 h at the highest elimination rate

Method used

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  • Preparation of a low-concentration nitrogen monoxide catalyst for elimination of iron, cerium and manganese at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 0.42 g of ferrous sulfate, 2.17 g of cerium nitrate, and 4.95 g of manganese chloride in 40 mL of water, stir evenly at room temperature, add dropwise 15 mL of 2.61 mol / L oxalic acid aqueous solution, continue stirring for 1.5 hours, and then filter and wash. Dry in an oven at 70°C for 12 hours, and then bake in a muffle furnace at 300°C for 3 hours to obtain Fe0.3Ce1Mn5, a specific surface area of ​​87 m 2 / g, the pore size is 7.0 nm.

[0016] Weigh 0.200 g of Fe0.3Ce1Mn5 catalyst and place it in a U-shaped reaction tube with an outer diameter of Φ6 and an inner diameter of Φ4, then put it in a water bath at 25°C, feed 10 ppm NO reaction gas, and the rest is air, with a space velocity of 110,000 mL g -1 h -1 , the highest elimination rate of NO was about 100%, and the elimination rate remained unchanged within 3.7 h.

Embodiment 2

[0018] Weigh 0.83 g of ferrous sulfate, 2.17 g of cerium nitrate, and 4.95 g of manganese chloride in 40 mL of water, stir evenly at room temperature, add dropwise 15 mL of 2.72 mol / L oxalic acid aqueous solution, continue stirring for 1.5 hours, and then filter and wash. Dry in an oven at 70°C for 12 hours, and then bake in a muffle furnace at 300°C for 3 hours to obtain Fe0.6Ce1Mn5, a specific surface area of ​​91 m 2 / g, the pore size is 6.8 nm.

[0019] Weigh 0.200 g of Fe0.6Ce1Mn5 catalyst and place it in a U-shaped reaction tube with an outer diameter of Φ6 and an inner diameter of Φ4, then put it in a water bath at 25°C, feed 10 ppm NO reaction gas, and the rest is air, with a space velocity of 110,000 mL g -1 h -1 , the highest elimination rate of NO was about 100%, and the elimination rate remained unchanged within 4.0 h.

Embodiment 3

[0021] Weigh 1.25 g of ferrous sulfate, 2.17 g of cerium nitrate, and 4.95 g of manganese chloride in 40 mL of water, stir evenly at room temperature, add dropwise 15 mL of 2.84 mol / L oxalic acid aqueous solution, continue stirring for 1.5 hours, and then filter and wash. Dry in an oven at 70°C for 12 hours, and then bake in a muffle furnace at 300°C for 3 hours to obtain Fe0.9Ce1Mn5, a specific surface area of ​​96m 2 / g, the pore size is 6.4 nm.

[0022] Weigh 0.200 g of Fe0.9Ce1Mn5 catalyst and place it in a U-shaped reaction tube with an outer diameter of Φ6 and an inner diameter of Φ4, then put it in a water bath at 25°C, feed 10 ppm NO reaction gas, and the rest is air, with a space velocity of 110,000 mL g -1 h -1 , the highest elimination rate of NO was about 100%, and the elimination rate remained unchanged within 6.1 h.

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Abstract

The invention discloses preparation of an iron, cerium and manganese catalyst for eliminating low-concentration nitric oxide at normal temperature. The catalyst is formed by synthesizing oxalic acid precipitated ferric salt, ceric salt and manganic salt, with the specific surface area being 87-141 m<2> / g and the average pore size being 4.8-7.0 nm. The catalyst can be used for the normal temperature catalytic oxidation of low-concentration nitric oxide, and has higher nitric oxide elimination property. When the concentration of nitric oxide is smaller than or equal to 10 ppm, the nitric oxide elimination rate of the catalyst can reach about 100 percent, and the service life of the catalyst can keep long while maintaining the elimination rate. The preparation has the characteristics of simple preparation technology, low cost and the like.

Description

technical field [0001] The invention relates to the preparation of a low-concentration nitrogen monoxide catalyst for eliminating iron, cerium and manganese at normal temperature, which is suitable for catalytic oxidation of environmental pollutant NO at normal temperature and has application prospects in the field of environmental purification. Background technique [0002] With the continuous improvement of the level of tunnel construction and the increasing number of cars, the air pollution caused by harmful gases in the tunnel operating environment has become a prominent problem. Due to the poor air flow in the tunnel, coupled with the cold start or frequent start of motor vehicles, the pollutants emitted are continuously accumulated, such as particulate matter, carbon monoxide (CO), nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) and hydrocarbons (HC) and other pollutants far exceed the national secondary air quality standards. Nitrogen oxides (NO x ) is one of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 何丹农杨玲高振源金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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