Cu/CeOx-TiO2 for selective catalytic oxidization of ammonia and preparation method thereof

A catalytic oxidation and catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of low temperature activity and low selectivity of catalyst, and achieve oxidation The effect of enhanced reducing activity, high N2 selectivity, and good low temperature activity

Inactive Publication Date: 2011-09-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this catalyst is that it has a higher NH 3 Catalytic oxidation activity and N 2 selectivity, and has good anti-SO 2 Properties (at 300°C, NH 3 The conversion rate is 100%, N 2 s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1, Cu / CeO x -TiO 2 Catalyst preparation and performance.

[0024] In the first step, the additive CeO x Add to TiO 2 Solid powder

[0025] 0.217g solid Ce(NO 3 ) 3 ·6H 2 O is dissolved in 50ml water, and then 2g powdered TiO 2 Immersed in Ce(NO 3 ) 3 In the solution, the molar ratio of Ce to Ti was 1 / 50, then dried at 60℃ for 6h, then heated in a muffle furnace to 300℃, calcined for 4h, and finally reduced to room temperature to obtain CeO oxide x -TiO 2 .

[0026] The second step is to load the active component copper by homogeneous precipitation method

[0027] Add 0.06g solid Cu(NO 3 ) 2 Dissolve in 10ml water, then take 2g of the solid oxide CeO prepared in the first step x -TiO 2 Add the copper nitrate solution to make the solid Cu(NO 3 ) 2 With solid oxide CeO x -TiO 2 The mass ratio of the mixture is 0.03:1, the mixed solution is magnetically stirred at 60°C, and urea with a concentration of 5g / L is added dropwise during the stirring process until it is completely...

Example Embodiment

[0030] Example 2, Cu / CeO x -TiO 2 Catalyst preparation and performance.

[0031] In the first step, the additive CeO x Add to TiO 2 Solid powder

[0032] Put 54.25gCe(NO 3 ) 3 ·6H 2 O is dissolved in 500ml water, and then 50g powdered TiO 2 Immersed in Ce(NO 3 ) 3 In the solution, the molar ratio of Ce to Ti was 1 / 5, and then dried at 120°C for 16h, then heated to 600°C in a muffle furnace, calcined for 2h, and finally reduced to room temperature to obtain the oxide CeO x -TiO 2 .

[0033] The second step is to load the active component copper by homogeneous precipitation method

[0034] 88.2g solid Cu(NO 3 ) 2 Dissolve in 10ml of water, then take 70g of the solid oxide CeO prepared in the first step x -TiO 2 Add the copper nitrate solution to make the solid Cu(NO 3 ) 2 With solid oxide CeO x -TiO 2 The mass ratio is 1.26:1. The mixed solution was magnetically stirred at 120°C, and urea with a concentration of 30g / L was added dropwise during the stirring process until complete precipi...

Example Embodiment

[0037] Example 3, Cu / CeO x -TiO 2 Catalyst preparation and performance.

[0038] In the first step, the additive CeO x Add to TiO 2 Solid powder

[0039] 1.81gCe(NO 3 ) 3 ·6H 2 O is dissolved in 100ml water, and then 10g powdered TiO 2 Immersed in Ce(NO 3 ) 3 In the solution, the molar ratio of Ce to Ti was 1 / 30, and then dried at 90°C for 10 hours, then heated to 400°C in a muffle furnace, calcined for 3 hours, and finally reduced to room temperature to obtain the oxide CeO x -TiO 2 .

[0040] The second step is to load the active component copper by homogeneous precipitation method

[0041] 6.8g solid Cu(NO 3 ) 2 ·3H 2 O is dissolved in 10ml of water, and then 10g of the solid oxide CeO prepared in the first step is taken x -TiO 2 Dissolved in the copper nitrate solution to make solid Cu(NO 3 ) 2 ·3H 2 O and solid oxide CeO x -TiO 2 The mass ratio is 0.68:1. The mixed solution was magnetically stirred at 90°C, and urea with a concentration of 20g / L was added dropwise during the stir...

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Abstract

The invention belongs to the technical field of preparation of catalyst for oxidization of ammonia and relates to a catalyst for selective catalytic oxidization of ammonia into pollution-free N2 and water and a preparation method thereof. The method is characterized in that: adding CeOx serving as an assistant into TiO2 solid powder by an impregnation process; and loading Cu serving as an active component of the catalyst by using urine as a precipitator and by using a homogeneous precipitation process, wherein the molar ratio of Ce to Ti in the catalyst is 1/50 to 1/5, and based on the weightof the catalyst, the weight content of Cu serving as the active component of the catalyst is 1 to 30 percent. The Cu/CeOx-TiO2 composite catalyst disclosed by the invention has high low-temperature activity and high N2 selectivity, can completely convert ammonia at 250 DEG C, has a N2 selectivity of up to 95 percent, and can effectively solve the problem of discharging ammonia-containing waste gases in plants.

Description

[0001] The invention belongs to the technical field of catalyst preparation for ammonia oxidation, and relates to a method for selectively catalytically oxidizing ammonia into pollution-free N 2 Catalyst with water and preparation method thereof. Background technique [0002] Ammonia is a colorless gas with a strong pungent odor. It not only endangers public health, but also poses a threat to the environment and ecosystem. Ammonia has been included in my country's odor pollutant emission standards and has become a key control for enterprises. s project. Ammonia is mainly produced in iron and steel, petrochemical, chemical fertilizer, landfill, glass manufacturing, pharmaceutical wastewater and food industry. There are many sources of pollution and large emissions. The traditional methods for removing ammonia in exhaust gas mainly include absorption method, adsorption method, biological filtration method and incineration method, etc., but these methods are prone to secondary po...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/02B01J37/03C01B21/02
Inventor 赵慧敏金婷孙红全燮陈硕
Owner DALIAN UNIV OF TECH
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