Medium/low temperature SCR (Selective Catalytic Reduction) denitration catalyst with gamma-Al2O3 as carrier and preparation method thereof

A technology of aluminum oxide and denitration catalyst, which is applied in the field of formula composition and preparation of medium and low temperature selective catalytic reduction denitration catalyst, can solve the problems of high cost, poor water and sulfur resistance, complicated preparation process, etc., and achieves high utilization rate , stable performance and simple preparation process

Inactive Publication Date: 2012-07-04
HUNAN UNIV
View PDF2 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of conventional SCR catalysts generally requires a higher temperature (300-400°C), while the flue gas temperature of some coal-fired devices is generally in the low-to-medium temperature range, but currently, ca

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

Example Embodiment

[0039] Example 1:

[0040] 1. The invention uses γ-Al 2 O 3 Supported medium and low temperature SCR denitration catalyst and its preparation:

[0041] (1) Using γ-Al 2 O 3 As a carrier, its characteristic is: γ-Al 2 O 3 The specific surface area is 142m 2 / g, the total pore volume is 0.43cm 3 / g, the average pore size is 12nm.

[0042] (2) Preparation method of composite impregnation solution: Add manganese acetate, lanthanum nitrate, and ferric nitrate to the water to prepare a composite impregnation solution. The composite impregnation solution is composed of the following components by mass percentage:

[0043] Manganese acetate 7%,

[0044] Lanthanum nitrate 4%,

[0045] Ferric nitrate 10%,

[0046] The rest is water.

[0047] (3) Loading of active components: the carrier γ-Al 2 O 3 Immerse in the composite impregnation solution prepared in step (2) for 3-15h, take it out and dry at room temperature (20℃), and then calcinate at 350-600℃ for 1-6h to prepare the γ-Al 2 O 3 The medium an...

Example Embodiment

[0054] Example 2:

[0055] The preparation method and product are the same as in Example 1, only the simulated smoke composition is changed, and the application is as follows:

[0056] Taking 0.50g of the catalyst of the present invention as the experimental object, in the temperature range of 200~350℃, the space velocity is 15,000 / h, and the simulated flue gas composition is: 1000ppm NO, NH 3 / NO=1.1, 5% O 2 , 400ppm SO 2 , 10% H 2 O, balance gas is N 2 , Its denitration efficiency is 77.12% at 200℃, and its denitration efficiency is 88.32% at 300℃. Generally, SO in flue gas 2 And H 2 O will cause catalyst poisoning, thereby reducing its denitration efficiency. It can be seen from the above that the catalyst of the present invention has better resistance to SO 2 And H 2 O performance, its denitration efficiency is still at a relatively high level, higher than the denitration efficiency of existing products under the same conditions (about 70%).

Example Embodiment

[0057] Example 3:

[0058] 1. The invention uses γ-Al 2 O 3 Supported medium and low temperature SCR denitration catalyst and its preparation:

[0059] (1) Using γ-Al 2 O 3 As a carrier, its characteristic is: γ-Al 2 O 3 The specific surface area is 142m 2 / g, the total pore volume is 0.43cm 3 / g, the average pore size is 12nm.

[0060] (2) Preparation method of composite impregnation solution: Add manganese acetate, lanthanum nitrate, and ferric nitrate to the water to prepare a composite impregnation solution. The composite impregnation solution is composed of the following components by mass percentage:

[0061] Manganese acetate 5%,

[0062] Lanthanum nitrate 3%,

[0063] Ferric nitrate 6%,

[0064] The rest is water.

[0065] (3) Loading of active components: the carrier γ-Al 2 O 3 Immerse in the composite impregnation solution prepared in step (2) for 3-15h, take it out and dry at room temperature (20℃), and then calcinate at 350-600℃ for 1-6h to prepare the γ-Al 2 O 3 The medium and...

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
Specific surface areaaaaaaaaaaa
Total pore volumeaaaaaaaaaa
Average pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of NOx control in environmental protection and relates to a medium/low temperature SCR (Selective Catalytic Reduction) denitration catalyst taking gamma-Al2O3 as a carrier and a preparation method thereof. The catalyst consists of the following ingredients according to the mass percentage content: 2-16% of MnO, 1-10% of La2O, 1-10% of FeO and the allowance of the carrier gamma-Al2O3; and the preparation method comprises the following steps: gamma-Al2O3 is soaked into composite soaking liquid with 5-25% of manganese acetate, 1-10% of lanthanum nitrate and 5-25% of ferric nitrate respectively, then is dried and is calcined at 350-600 DEG C for 1-6 hours, therefore, the catalyst is obtained. The medium/low temperature denitration catalyst is prepared by loading various metallic oxides to realize the dispersion optimization of active ingredients and the catalysis cooperation among the ingredients; at 200 DEG C, the conversion rate of NO is morethan 85%, and the water and sulfur resistance is better. The preparation method is simple and is easy in operation, and the catalyst is steady in activity and long in service life.

Description

technical field [0001] The invention belongs to NO in environmental protection x In the field of control technology, it specifically involves a new type of high-efficiency γ-Al 2 o 3 The invention relates to the formula composition and preparation method of medium and low temperature (200-350 DEG C) selective catalytic reduction (SCR) denitrification catalyst with carrier. Background technique [0002] In the field of environmental protection, nitrogen oxides (NO x ) emissions are receiving more and more attention, the main components of which are NO and NO 2 Among them, NO accounts for more than 90%, which is very destructive to the natural environment and human health, and will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer hole effect, and serious pollution; NO is very toxic, and hemoglobin The affinity of carbon dioxide is more than 1000 times that of CO, which can seriously damage people's eyes and stomach...

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): B01J23/889B01D53/86B01D53/56
Inventor 李彩亭赵伟伟李珊红路培曾光明张星
Owner HUNAN 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