SCR denitration catalyst and preparation method thereof

A denitrification catalyst, lanthanum nitrate technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of sensitivity, insufficient contact with Al and active components, and limit catalyst performance, etc., to achieve Strong combination, improved activity and anti-toxic performance, improved surface structure and mechanical stability

Active Publication Date: 2008-05-28
山西蒲洲博奇环保科技有限公司
View PDF1 Cites 63 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carrier aluminum and titanium elements prepared by this method form a layered structure, and the underlying Al and active components cannot be fully contacted, which limits the performance of the catalyst.
[0009] At present, the SCR catalysts used in industry are mainly based on TiO 2 as the carrier, V 2 o 5 or WO 3 -V 2 o 5 Composite oxide is the active component. The actual engineering test proves that these two catalysts have high durability and good adaptability. However, due to the simple components, they are sensitive to sulfur and water vapor, and the catalyst will be absorbed by the flue gas. Dust wear, blockage and poisoning by arsenic, alkali metals and other substances, the deactivation is more serious

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

[0033] (1)Al 2 o 3 Sol preparation

[0034] Heat 50ml of 4M ammonia water to 85°C, and 50ml of 4M Al(NO 3 ) 3 Slowly add it dropwise to ammonia water while stirring continuously. After 1 hour, add 1M HCl in such an amount that the pH value of the solution is adjusted to 3. Stir at constant temperature at 85°C for 12 hours to obtain a stable and transparent boehmite (AlOOH) sol .

[0035] (2)Al 2 o 3 -SiO 2 -TiO 2 Preparation of composite sol

[0036]Add 15 g of ethyl orthosilicate to 20 g of absolute ethanol, stir for 5 minutes, add 20 g of butyl titanate, stir for 5 minutes, then add 2 g of deionized water to the above solution, stir for 10 minutes, 30 ℃ for 2 hours, then add 20g of the boehmite (AlOOH) sol prepared in step (1) to the above solution, stir for 20 minutes, and age for 2 hours at 30 ℃ to make Al 2 o 3 -SiO 2 -TiO 2 Composite sol.

[0037] (3) Coating of the carrier

[0038] Immerse the cordierite honeycomb ceramic sample in the sol prepared in ste...

Embodiment 2

[0044] The catalyst 2000g that makes among the embodiment 1 is put into diameter and is 10cm, and height is in the reactor of 50cm, passes into typical boiler flue gas, concrete composition is the NO of 500ppm, the SO of 400ppm 2 , 15% CO 2 , 7% H 2 O, the rest are N 2 , the flue gas temperature is 300°C, and the space velocity is 30000h -1 , NO x / NH 3 It was 1.1, and the denitrification rate was 86% after 200 hours of reaction.

Embodiment 3

[0046] (1)Al 2 o 3 Sol preparation

[0047] Heat 50ml of 5M ammonia water to 85°C, and 50ml of 5M Al(NO 3 ) 3 Slowly add it dropwise into ammonia water while stirring constantly. After 1 hour, add 1M HCl to adjust the pH value of the solution to 5. Stir at constant temperature at 85°C for 12 hours to obtain a stable and transparent boehmite (AlOOH) sol.

[0048] (2)Al 2 o 3 -SiO 2 -TiO 2 Preparation of composite sol

[0049] Add 10 g of ethyl orthosilicate to 20 g of absolute ethanol, stir for 5 minutes, add 25 g of butyl titanate, stir for 5 minutes, then add 1 g of deionized water to the above solution, stir for 10 minutes, 30 ℃ for 2 hours, then add 20g of the boehmite (AlOOH) sol prepared in step (1) to the above solution, stir for 20 minutes, and age for 2 hours at 30 ℃ to make Al 2 o 3 -SiO 2 -TiO 2 Composite sol.

[0050] (3) Coating of the carrier

[0051] Immerse the sample of cordierite honeycomb ceramics in the sol prepared in step (2). After immersion...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of an SCR denitration catalyst, which comprises the following steps: (1) Al2O3 sol is prepared, which comprises the steps that hot ammonia, the Al2O3 is added in drops into the ammonia and then HCI is added and the mixture is stirred; (2) Al2O3-SiO2-TiO2 composite sol is prepared, which comprises the steps that tetratethoxy-silane, butyl titanate, deionized water are sequentially put into ethanol to be aging and then the sol prepared by step (1) is adding to be stirred and aging; (3) vector is coated, which comprises the steps that cordierite honeycomb immersed into the sol of step (2) and the raffinate in a channel is cleaned, dried and roasted after being taken out; (4) active component impregnating solution is prepared, which comprises the steps that lanthanum nitrate, ammonium metavanadate and ammonium paratungstate are dissolved into the deionized water after being mixed together and oxalate acid is added to be aging; (5) the active component is loaded, which comprises the steps that the vector of the step (3) is immersed into the impregnating solution of the step (4) and then the raffinate in the channel is cleaned to be dried and roasted. The invention also relates to the denitration catalyst which is prepared by the method.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst used in SCR denitrification of flue gas in a thermal power plant and a preparation method thereof. Background technique [0002] According to statistics, thermal power installed capacity occupies a relatively large proportion in the field of power generation. For example, thermal power installed capacity accounts for more than 74% of China's installed power generation capacity. 2 and dust, NO x It is also a major pollutant. Expected to NO by 2010 x Emissions will further increase, for example, China may reach 5.5 million tons, becoming the most important pollutant emissions from thermal power plants. Countries, including China, have tightened restrictions on NO x Various regulations and policies on emissions are also being introduced or will be introduced soon, so the control of NO x emissions have drawn widespread attention from all walks of life. [0003] Compared with other techn...

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): B01J23/30B01J23/22B01J23/10B01J37/02
Inventor 白云峰刘鹏程吴树志崔一尘张妍张明李永旺董梦阳
Owner 山西蒲洲博奇环保科技有限公司
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