Selective catalytic reducing NOx catalyst based on MnOx/TiO2 system at low-temperature and production thereof

A selectivity and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as poor dispersion, catalyst surface sintering and active point reduction , to achieve the effects of reducing the degree of sintering, increasing the utilization of O, and high NO removal rate

Inactive Publication Date: 2006-08-16
ZHEJIANG UNIV
View PDF0 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After testing, it was found that after the loading of Mn was greater than 10%, the original amorphous MnO x Converted to crystalline MnO x , crystalline MnO x to NO x The removal of has no promotion effect, therefore, the catalyst MnO prepared by impregnation method x Poor dispersion of the catalyst, leading to surface sintering and reduction of active sites in the catalyst

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

[0024] Adopt sol-gel method, take n-butyl titanate, ethanol, water, Mn(NO3) 2, acetic acid as raw material, the volume ratio of each component is as follows, n-butyl titanate: ethanol: water: acetic acid=1: 1.5:0.5:0.5, Mn(NO 3 ) 2 The added amount is Mn:Ti=0.4, mixed, dried and ground after the sol is transformed into a gel, and roasted at 200-600°C to obtain the catalyst.

[0025] Application treatment NO: NH3=1, O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The SCR method for flue gas denitrification, when the reaction temperature is 100°C, the catalytic efficiency is about 50%, and when the reaction temperature is 150°C, the catalytic efficiency is above 90%.

Embodiment 2

[0027] Adopt sol-gel method, with titanium isopropoxide, ethanol, water, Mn (NO3) 2, acetic acid are raw materials, the volume ratio of each component is as follows, titanium isopropoxide: ethanol: water: acetic acid=1: 1.65: 0.4:0.5, Mn(NO 3 ) 2 The added amount is Mn:Ti=0.4, mixed, dried and ground after the sol is transformed into a gel, and roasted at 200-600°C to obtain the catalyst.

[0028] Application treatment NO: NH3=1, O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The SCR method for flue gas denitrification, when the reaction temperature is 100°C, the catalytic efficiency is about 50%, and when the reaction temperature is 150°C, the catalytic efficiency is above 90%.

Embodiment 3

[0030] Using the sol-gel method, tetraethoxytitanium, ethanol, water, MnCl 2 , hydrochloric acid as raw material, the volume ratio of each component is as follows, tetraethoxytitanium: ethanol: water: acetic acid=1: 1.85: 0.08: 0.03, MnCl 2 The added amount is Mn:Ti=0.3, mixed, dried and ground after the sol is transformed into a gel, and roasted at 200-600°C to obtain the catalyst.

[0031] Application treatment NO: NH3=1, O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The SCR flue gas denitrification method, when the reaction temperature is 120°C, the catalytic efficiency is about 50%, and at 200°C, it can reach more than 90%.

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

A catalyst based on MnOx/TiO2 system for low-temp selective catalytic reduction of NOx is proportionally prepared from alkoxy compound of Ti, alcohol solvent, water, protonic acid, soluble salt of Mn and the soluble salt of transition element through proportional mixing, stirring until sol becomes gel, drying, grinding and high-temp calcining.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control, in particular to a catalyst based on MnO prepared by a sol-gel method. x / TiO 2 Systematic low temperature selective catalytic reduction of NO x catalyst. Background technique [0002] After years of research and practice, using NH 3 SCR flue gas denitrification as a reducing agent has become increasingly mature, and the SCR catalysts for industrial applications are mainly V 2 o 5 -WO 3 / TiO 2 (V 2 o 5 -MoO 3 / TiO 2 ), the operating temperature range of this type of catalyst is roughly between 300 and 400 °C, and it is placed before the desulfurization and dust removal device. In practical applications, such catalysts have anti-SO 2 The advantages of strong ability and stable operation. [0003] However, due to the high operating temperature required by industrial catalysts, the SCR denitration device must be placed before the desulfurization and dust...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J21/06B01J37/00B01D53/56
Inventor 吴忠标江博琼王海强官宝红赵伟荣
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap