Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 8 Cited by
  • 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 selectivity can reach about 80%), the disadvantage is that the low-temperature activity and selectivity of the catalyst are low, at 250 ° C, NH 3 The conversion rate is 95%, N 2 Selectivity below 80%

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1, Cu / CeO x -TiO 2 Preparation of catalysts and their properties.

[0024] In the first step, the additive CeO was impregnated x added to TiO 2in solid powder

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

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

[0027] 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 Added to the copper nitrate solution, so that the solid Cu(NO 3 ) 2 with solid oxide CeO x -TiO 2 The mass ratio of the mixed solution is 0.03:1. The mixed solution is magnetically stirred at 60°C. During the stir...

Embodiment 2

[0030] Example 2, Cu / CeO x -TiO 2 Preparation of catalysts and their properties.

[0031] In the first step, the additive CeO was impregnated x added to TiO 2 in solid powder

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

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

[0034] 88.2g solid Cu(NO 3 ) 2 Dissolve in 10ml water, then take 70g of the solid oxide CeO prepared in the first step x -TiO 2 Added to the copper nitrate solution, so that 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...

Embodiment 3

[0037] Example 3, Cu / CeO x -TiO 2 Preparation of catalysts and their properties.

[0038] In the first step, the additive CeO was impregnated x added to TiO 2 in solid powder

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

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

[0041] 6.8g of solid Cu(NO 3 ) 2 ·3H 2 O is dissolved in 10ml of water, then take 10g of the solid oxide CeO prepared in the first step x -TiO 2 Dissolved in the copper nitrate solution, so that 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. During stirr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com