Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof

A technology of NH3-SCR and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. It can solve the problems of unexamined catalyst activity and achieve high and low temperature activity , The effect of simple preparation process and easy operation

Inactive Publication Date: 2013-07-03
上海钒铖环保科技有限公司 +2
4 Cites 22 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Qi [9] Reported Manganese Composite Catalyst Mn-CeO 2 It is the most active catalyst among the low-temperature SCR catalysts reported so far. Experimental research shows that when the molar ratio of Mn(Mn+Ce) is 0.3, the catalyst has a space ...
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

Method used

[0067] In a fixed-bed reactor, the SCR denitrification activity of the catalyst was tested. The reactor was in the shape of a standpipe, and the upper and lower ends were filled with quartz sand, and the catalyst was placed in the middle. The schematic diagram of the activity testing device is shown in Fig. 1 . All cylinder gases come from Shanghai Shenkai Gas Technology Co., Ltd. The gas flow is controlled by a CS200A mass flowmeter of Beijing Qixing Huachuang Electronics Co., Ltd. Water vapor enters the mixer from nitrogen through the steam generator. What is used to control the temperature of the water vapor generating device is the SDC-6 low-temperature constant temperature bath produced by Beijing Hongda Xinchen Biotechnology Co., Ltd. Reactor and mixer temperature are controlled by program temperature controller. T...
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

Abstract

The invention discloses a low temperature NH3-SCR denitration catalyst for a flue gas with low water vapor content. The catalyst is an oxide prepared by an impregnation method with TiO2 as a carrier loaded with Mn, Ce and Nb. The invention also discloses a preparation process of the catalyst. A preparation process of the catalyst is simple and easy to operate. The addition of Nb increases denitration performance of the catalyst for the flue gas with water vapor content as high as 12% and SO2 content of 1,000 ppm. The denitration rate at a temperature of 160 DEG C and in presence of 12% of water vapor and 1,000 ppm of SO2 can reach over 80%.

Application Domain

Technology Topic

Image

  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof
  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof
  • Low temperature NH3-SCR denitration catalyst for flue gas with low water vapor content, and preparation method thereof

Examples

  • Experimental program(4)
  • Effect test(1)

Example Embodiment

[0044] Example 1
[0045] Weigh 7.44g of niobium oxalate and dissolve in 20ml of deionized water at 50°C. After the niobium oxalate is completely dissolved, add 21.05g of cerium nitrate and 7.92g of manganese acetate to the niobium oxalate solution to form a mixed solution, and add 12.91g of TiO 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips, Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.
[0046] The detection method of the denitrification rate of the prepared catalyst is as follows: first, measure the NO concentration in the simulated flue gas before passing through the reactor with a NOx nitrogen oxide analyzer, then put the catalyst in a tubular fixed-bed reactor, and heat the reactor through an electric furnace. Heating to the required temperature, passing simulated flue gas and reducing agent NH 3 , use NOx nitrogen oxide analyzer to measure the NO concentration in the flue gas at the outlet of the reactor, the denitrification rate of the catalyst is calculated as:
[0047]
[0048] In the above formula: Co is the concentration of NO before entering the reactor; C is the concentration of NO at the outlet of the reactor.
[0049] Detection of catalyst for SO 2 When it is resistant to water vapor, 1000ppmSO is introduced into the simulated flue gas 2 and 12% water vapor.
[0050] According to the results of the activity test, the catalyst can be used at a temperature of 160°C and a space velocity of 20000h -1 , NO, NH 3 and SO 2 Concentration 1000ppm, O 2 With a content of 1%, the denitrification rate can reach 82.8% in the presence of 12% water vapor.

Example Embodiment

[0051] Example 2
[0052] Weigh 1.86g of niobium oxalate and dissolve in 20ml of deionized water at 50°C. After the niobium oxalate is completely dissolved, add 21.05g of cerium nitrate and 7.92g of manganese acetate into the niobium oxalate solution to form a mixed solution, and add 12.91g of TiO 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips, Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.
[0053] The detection method of the denitration rate of the prepared catalyst is the same as that in Example 1.
[0054] According to the results of the activity test, the catalyst can be used at a temperature of 160°C and a space velocity of 20000h -1 , NO, NH 3 and SO 2 Concentration 1000ppm, O 2 With a content of 1%, the denitrification rate can reach 83.6% in the presence of 12% water vapor.

Example Embodiment

[0055] Example 3
[0056] Weigh 21.05g of cerium nitrate and 7.92g of manganese acetate dissolved in 20ml of deionized water at 50°C to form a mixed solution, and add 12.91g of TiO to the mixed solution 2 Prepare the mixture, keep the mixture at 50°C and stir for 1 hour to make the mixture fully homogeneous, and let stand for 1 hour. Dry at 120°C for 12 hours and bake at 550°C for 6h. The roasted product is cooled, pulverized, sieved, and the powder smaller than 80 mesh is taken for later use. Weigh 7.00g of powder less than 80 mesh and mix with 3.00g of pseudo-boehmite powder evenly, add 2.0ml of 10wt% nitric acid solution to the mixed powder and mix evenly to form a dough, put it into a syringe and extrude into strips. Drying at 550°C for 6 hours. Cool after roasting, crush and sieve to take the 20-40 mesh part as the catalyst.
[0057] The detection method of the denitration rate of the prepared catalyst is the same as that in Example 1.
[0058] According to the results of the activity test, the catalyst can be used at a temperature of 160°C and a space velocity of 20000h -1 , NO, NH 3 and SO 2 Concentration 1000ppm, O 2 With a content of 1%, the denitrification rate can reach 68.7% in the presence of 12% water vapor.
[0059] attached Image 6 It can be clearly seen that after the addition of Nb, the catalyst is resistant to high concentrations of water vapor and SO 2 The resistance has been significantly improved.
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

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
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

Similar technology patents

Lactobacillus plantarum strain and application thereof

ActiveCN101724591AStrong growth abilitySimple preparation processBacteriaMicroorganism based processesTryptamineGram
Owner:NANJING AGRICULTURAL UNIVERSITY

Classification and recommendation of technical efficacy words

  • Simple preparation process
  • Easy to operate

People also interested in

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