SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of cement kiln and preparation method thereof

An SCR catalyst, low temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. strength, etc.

Active Publication Date: 2014-03-19
CHINA BUILDING MATERIALS ACAD
View PDF5 Cites 56 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the studies on Mn-based catalysts reported in the literature are powder catalysts, which are far away from practical applications because they do not have a certain shape and mechanical strength ([1] Qi G, Yang R T, Chang R.MnO x -CeO 2 mixed oxides prepared by coprecipitation for selective catalytic reduction of NO with NH 3 at low temperatures.Applied Catalysis B:Environmental,2004,51:93-106.[2]Wang Yanli,GeChuanzhang,Zhan Liang,et al,MnOx-CeO2 / activated carbon honeycomb catalyst for selective catalytic reduction of NO with NH3at low temperature , Industrial and Engineering Chemistry Research, 2012, 51(36): 11667–11673 [3] Li J, Chang H, Ma L. Low temperature selective catalytic reduction of NOwith NH 3 over metal oxide and zeolite catalysts-a review.Catalyss Today,2011,175(1):147-156.)

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of cement kiln and preparation method thereof
  • SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of cement kiln and preparation method thereof
  • SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of cement kiln and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1, preparation SCR catalyst

[0059] The preparation of SCR catalyst comprises the following steps:

[0060] 1. Preparation of carrier

[0061] will analyze pure titanium dioxide (TiO 2 ) powder with H 2 O, CMC (hydroxymethyl cellulose), MEA (monoethanolamine), etc. are mixed according to the mass ratio of 100:10:1:1, formed into agglomerates, extruded to obtain a strip carrier, and dried in a 60°C drying oven Dry it, and then place it in a muffle furnace for calcination at 1000°C (500-1200°C is acceptable) for 6h (2-10h is acceptable) to obtain a carrier.

[0062] 2. Loading of active components

[0063]1) According to step 1, select a strip-shaped carrier with a certain mass and uniform size, the percentage of the active component in the overall mass of the catalyst including the carrier is 15wt%, and the manganese (Mn) element accounts for the moles of the total elements of the active component Ratio of 0.75 (75% by mole percent), calculate the mass o...

Embodiment 2

[0065] Embodiment 2, preparation SCR catalyst

[0066] Include the following steps:

[0067] 1. Preparation of carrier

[0068] will analyze pure titanium dioxide (TiO 2 ) powder and silicon dioxide (SiO 2 ) powder with H 2 O, CMC (hydroxymethyl cellulose), MEA (monoethanolamine), etc. are mixed according to the mass ratio of 50:50:10:1:1, formed into agglomerates, extruded to obtain a strip carrier, and dried in a 60°C drying oven Drying in the oven, and then placed in a muffle furnace for calcination at 1000°C (500-1200°C is acceptable) for 4h (2-10h is acceptable) to obtain the carrier.

[0069] 2. Loading of active components

[0070] Same as Example 1.

Embodiment 3

[0071] Embodiment 3, preparation SCR catalyst

[0072] Include the following steps:

[0073] 1. Preparation of carrier

[0074] will analyze pure titanium dioxide (TiO 2 ) powder and aluminum trioxide (Al 2 o 3 ) powder with H 2 O, CMC (hydroxymethyl cellulose), MEA (monoethanolamine), etc. are mixed according to the mass ratio of 50:50:10:1:1, agglomerated, extruded to obtain a honeycomb carrier, and dried in a 60°C drying oven Dry it in the oven, and then place it in a muffle furnace for calcination at 1000°C for 6 hours to obtain a carrier.

[0075] 2. Loading of active components

[0076] Same as Example 1.

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
denitrification rateaaaaaaaaaa
denitrification rateaaaaaaaaaa
Login to view more

Abstract

The invention provides an SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of a cement kiln and a preparation method thereof. The SCR catalyst is characterized in that by adjusting the technological conditions such as proportions of active components, mass ratio of carriers and active components, calcining temperature and the like, a composite metal oxide which is formed by one or more metal elements out of manganese (Mn), ferrum (Fe), copper (Cu), cerium (Ce), lanthanum (La), bismuth (Bi), niobium (Nb), tantalum (Ta) and the like is loaded on a carrier by adopting an impregnation method, and tungsten and molybdate are used as active assistants. The active components in the SCR catalyst are uniformly distributed on the surface of the carrier in an unformed shape, the low-temperature activity of the catalyst is improved by utilizing the synergistic effect of multiple metals, the SCR catalyst is particularly suitable for the denitration of the smoke which is discharged from a dust collector on the tail of the cement kiln, the denitration rate can reach higher than 70 percent at the temperature of 80 DEG C, the denitration rate is higher than 90 percent in the temperature range of 125 DEG C to 200 DEG C, and the toxicity resistance is strong.

Description

technical field [0001] The invention belongs to the catalyst in the technical field of nitrogen oxide emission reduction in the cement industry, in particular to a catalyst based on Selective Catalytic Reduction (SCR) technology and its Preparation. Background technique [0002] During the "Twelfth Five-Year Plan" period, the state has strengthened the control of nitrogen oxide emissions from the cement industry, and it is difficult for the simple low-nitrogen combustion technology to meet the increasingly stringent emission standards. Selective catalytic reduction (SCR) technology refers to the use of reducing agents (such as NH 3 , liquid ammonia, urea) "selectively" react with NOx in the flue gas and generate non-toxic and pollution-free N 2 and H 2 O. The core of this technology is the SCR catalyst, whose performance directly determines the denitrification effect and the application of the technology. SCR technology has been widely used in coal-fired power plant boi...

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): B01J23/889B01D53/86B01D53/56
Inventor 汪澜颜碧兰房晶瑞
Owner CHINA BUILDING MATERIALS ACAD
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