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A Mesoporous Zr, Ce Co-doped Scr Catalyst

A SCR catalyst, co-doping technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of catalyst particle agglomeration, easy surface pollution, catalytic activity Reduce and other problems to achieve the effect of improving selectivity and improving water and sulfur resistance

Active Publication Date: 2020-12-01
合肥中亚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after long-distance operation, catalyst particles are prone to agglomeration and surface contamination, resulting in reduced catalytic activity and poor stability.

Method used

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  • A Mesoporous Zr, Ce Co-doped Scr Catalyst
  • A Mesoporous Zr, Ce Co-doped Scr Catalyst
  • A Mesoporous Zr, Ce Co-doped Scr Catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 0.128mol acetylacetone to 0.064mol tetrabutyl titanate to make the acetylacetone / Ti molar ratio = 2; then add 50mL stoichiometric ethanol solution of zirconium nitrate and stir for 2 hours to obtain a sol; place the sol in a water bath at 60°C After concentration, drying at 120°C for 6 hours, and then calcining at 500°C for 3 hours to obtain a Zr-doped titania carrier, wherein the added amount of zirconium nitrate is such that the molar ratio Zr / Ti=0.005-0.02. The prepared Zr-doped titania carrier was impregnated in 50 mL of ammonium paratungstate aqueous solution, refluxed in a water bath at 60 °C for 4 h, dried at 120 °C for 6 h, and then calcined at 500 °C for 2 h to obtain Zr-doped WO 3 / TiO 2 , where WO 3 The loading amount is 1wt%, denoted as ZR-WTi; Zr doped WO 3 / TiO 2 Immersed in 50 mL of ammonium metavanadate aqueous solution, refluxed in a water bath at 60 °C for 4 h, dried at 120 °C for 6 h, and then calcined at 500 °C for 2 h to obtain Zr-doped V 2 ...

Embodiment 2

[0030] On the basis of Example 1, when adding the ethanolic solution of 50mL of stoichiometric zirconium nitrate, add the methanol solution of 50mL of stoichiometric cerous chloride, other steps are the same as in Example 1, and Zr and Ce are co-doped Miscellaneous V 2 o 5 -WO 3 / TiO 2 The denitration catalyst is denoted as m-ZrCe-VWTi. The NO removal rate was evaluated in the same manner as in Example 1.

Embodiment 3

[0036] Example 3 Catalyst NH of the present invention 3 Selective catalytic reduction NO activity and water and sulfur resistance performance test

[0037] The reaction temperature is 300°C, and 2.5% (vol) H 2 O, after that, collect data every 0.5h, pass through H 2 After O 2h, 100ppm SO was introduced into the reaction system 2 , collect data once every 0.5h, continue to react for 2h to stop the reaction, and other reaction conditions are the same as in Example 1. The relevant test data are shown in Table 2.

[0038] Table 2. The effect of Zr doping on the water and sulfur resistance activity of the catalyst

[0039]

[0040] As can be seen from Table 2, the Zr element of the present invention is at V 2 o 5 -WO 3 / TiO 2 Doping in can not only improve the low temperature NH 3 Selective catalytic reduction of NO activity can also improve the anti-water and anti-sulfur activity of the SCR catalyst.

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Abstract

The invention discloses a mesoporous Zr and Ce co-doped V2O5-WO3 / TiO2 catalyst for selective catalytic denitrification. According to the catalyst, a transition metal element Zr and a rare element Ce are doped into the widely-used commercial catalyst V2O5-WO3 / TiO2, and the loading capacities of V and W elements in the catalyst and the loading method of the W element are optimized, so that an activetemperature window of the V2O5-WO3 / TiO2 catalyst is broadened. The mesoporous Zr and Ce co-doped V2O5-WO3 / TiO2 catalyst disclosed by the invention solves the technical problems that a V2O5-WO3 / TiO2 catalyst cannot achieve a denitrification purpose when the coal burning flue gas temperature is too low, and the air velocity varies greatly, and the water and sulfur resistance of the catalyst is low,and is suitable for the selective catalytic denitrification treatment of flue gas produced by industrial coal burning.

Description

technical field [0001] The present invention relates to a kind of SCR catalyst and its preparation method and application, especially a kind of mesoporous heteroatom-doped V 2 o 5 -WO 3 / TiO 2 A catalyst, an SCR catalyst with low content, high catalytic efficiency, low activation temperature, strong anti-water and anti-sulfur activity, and its application in catalytic denitrification in stationary source flue gas. Background technique [0002] At present, my country's energy consumption is increasing rapidly, the number of motor vehicles is increasing year by year, NOx emissions are rising, and the type of acid rain has changed from sulfuric acid to sulfuric acid and nitric acid. With SO 2 With the increasingly mature removal technology, NOx removal has become a research hotspot. [0003] According to the relationship between fuel and unit, corresponding technical measures are taken to control NOx before, during and after combustion. The pre-combustion control technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2255/2065B01D2255/20707B01D2255/20715B01D2255/20723B01D2255/20776B01J23/30
Inventor 延海港
Owner 合肥中亚环保科技有限公司
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