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Samarium-doped manganese pickaxe composite oxide catalyst and preparation method and application thereof

A composite oxide and catalyst technology, applied in the field of environmental protection technology and environmental catalysis, can solve problems such as no catalyst process, and achieve the effects of good medium and low temperature denitration efficiency, high efficiency, and good anti-sulfur poisoning performance.

Pending Publication Date: 2020-09-29
YIXING YIGANG ENVIRONMENTAL PROTECTION ENG & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature of flue gas emitted by small and medium-sized coal-fired boilers, mainly glass furnaces, cement furnaces and metallurgical sintering furnaces, is generally at 120-300 o C, which is much lower than the mature V of the catalyst process 2 o 5 -WO 3 / TiO 2 The activation temperature of the catalyst causes the non-electricity industry to have no mature catalyst technology and cannot carry out NOx emission reduction work in accordance with the national emission standards

Method used

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  • Samarium-doped manganese pickaxe composite oxide catalyst and preparation method and application thereof
  • Samarium-doped manganese pickaxe composite oxide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] mn 0.5 Zr 0.5 Preparation of Manganese-Zirconium Composite Oxide Catalyst

[0023] Step (a) Weigh an appropriate amount of zirconium nitrate, dissolve it in deionized water, prepare a 5mol / L zirconium nitrate solution, and place it for later use.

[0024] Step (b) Take 11.62ml of 50 wt% manganese nitrate solution and 10ml of 5mol / L zirconium nitrate solution prepared in step (a), stir and mix at room temperature for 30min to obtain a mixed solution;

[0025] Step (c) To the mixed solution obtained in step (b), add an appropriate amount of ammonia water (26 wt%) drop by drop while stirring, so that the pH reaches 9-10, and stir for 1 hour to obtain a suspension.

[0026] Step (d) Suction filter the suspension obtained in step (c), wash with deionized water, and dry the obtained precipitate in an oven at 120ºC for 10-15 hours, then put it into a muffle furnace and roast for 4 hours to prepare The desired samarium-doped manganese-ax composite oxide catalyst was obtained...

Embodiment 2

[0029] SM 0.1 mn 0.5 Zr 0.4 Preparation of Samarium Manganese Zirconium Composite Oxide Catalyst

[0030] Step (a) Weigh an appropriate amount of zirconium nitrate and samarium nitrate and dissolve them in deionized water to prepare a zirconium nitrate solution with a concentration of 4 mol / L and a samarium nitrate solution with a concentration of 1 mol / L, and store them for later use.

[0031] In step (b), take 11.62ml of 50 wt% manganese nitrate solution, 10ml of 4mol / L zirconium nitrate solution and 10ml of 1mol / L samarium nitrate solution prepared in step (a), stir and mix at room temperature for 30min to obtain a mixed solution;

[0032] Step (c) To the mixed solution obtained in step (b), add ammonia water (26 wt%) drop by drop while stirring to make the pH reach 9-10, stir for 1 hour to obtain a suspension.

[0033] Step (d) Suction filter the suspension obtained in step (c), wash it with deionized water, and dry the obtained precipitate in an oven at 120 ºC for 10-...

Embodiment 3

[0036] SM 0.2 mn 0.5 Zr 0.3 Preparation of Samarium Manganese Zirconium Composite Oxide Catalyst

[0037] Step (a) Weigh an appropriate amount of zirconium nitrate and samarium nitrate and dissolve them in deionized water to prepare a zirconium nitrate solution with a concentration of 3 mol / L and a samarium nitrate solution with a concentration of 2 mol / L, and store them for later use.

[0038] In step (b), take 11.62ml of 50 wt% manganese nitrate solution, 10ml of 3mol / L zirconium nitrate solution and 10ml of 2mol / L samarium nitrate solution prepared in step (a), stir and mix for 30min at room temperature to obtain a mixed solution;

[0039] Step (c) To the mixed solution obtained in step (b), add ammonia water (26 wt%) drop by drop while stirring to make the pH reach 9-10, stir for 1 hour to obtain a suspension.

[0040] Step (d) Suction filter the suspension obtained in step (c), wash with deionized water, and dry the obtained precipitate in an oven at 120ºC for 10-15 h...

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Abstract

The invention relates to a samarium-doped manganese pickaxe composite oxide denitration catalyst with a molecular formula of SmxMn0. 5Zr0. 5-x (x is more than or equal to 0 and less than or equal to 0.4) and a preparation method of the catalyst. The preparation method comprises the following steps: respectively preparing a salt solution of samarium, pickaxe and manganese; taking the prepared saltsolution of samarium, pickaxe and manganese, and stirring at room temperature to obtain a mixed solution; dropwise adding ammonia water into the obtained mixed solution while stirring until the pH value is 9-10, and continuing to stir until sufficient reaction; and carrying out suction filtration, washing and drying on the obtained reaction solution, and roasting in a muffle furnace to obtain thesamarium-doped manganese pickaxe composite oxide denitration catalyst. Under the condition that the air speed is 160000 h <-1 >, the net conversion rate of the nitrogen oxide reaches 90% or above within the temperature range of 125-300 DEG C, and the catalyst has good water resistance and sulfur resistance at 250 DEG C. The catalyst can be used for removing nitrogen oxide discharged by fixed sources such as coal-fired power plants, industrial boilers and building material kilns and diesel vehicle moving sources.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and environmental catalysis, and in particular relates to a samarium-doped manganese pickaxe composite oxide denitrification catalyst and a preparation method. The catalyst can be used to eliminate nitrogen oxides (NOx) under medium and low temperature conditions. Background technique [0002] Nitrogen oxide (NOx) is one of the main air pollutants. It is not only harmful to human health, but also a major factor causing environmental problems such as acid rain, smog, ozone destruction, and greenhouse effect in various parts of my country. Its emission control has become an environmental catalyst and Research hotspots in the field of atmospheric control. At present, ammonia selective catalytic reduction (Selective Catalytic Reduction, SCR) nitrogen oxide technology is considered to be the best and most widely used nitrogen oxide removal technology. The reducing agent selectively r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01J23/002B01D53/8628B01J2523/00
Inventor 裴叶舜祁德祥
Owner YIXING YIGANG ENVIRONMENTAL PROTECTION ENG & MATERIALS
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