Flue gas denitrification catalyst with wide activity temperature interval as well as preparation method thereof

A denitration catalyst, active temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Poor low temperature activity, etc., to achieve good resistance to H2O and SO2 poisoning, wide active temperature range, and good low temperature activity

Inactive Publication Date: 2014-07-02
北京宏庚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to VWTiO 2 The catalyst has a narrow temperature range, poor low temperature activity, and is difficult to meet actual industrial needs. It provides a catalyst with good low temperature activity, wide temperature window, suitable for industrial applications, and H resistance. 2 O and SO 2 Flue gas denitrification catalyst with strong poisoning ability and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Stir the ammonium metatungstate at a temperature of 50 °C to obtain a solution;

[0032] (2) The TiO 2 The powder was added to the solution obtained in step (1), mixed and stirred evenly by the equal volume impregnation method, ultrasonically oscillated for 40 minutes with an ultrasonic cleaner, then dried in an oven at 110 °C for 8 hours, and then calcined at 400 °C for 4 hours to obtain WO 3 / TiO 2 Precursor;

[0033] (3) Dissolve ammonium metavanadate in oxalic acid solution at a temperature of 60°C, adjust PH=2, and stir for 30min to obtain a solution;

[0034] (4) Add the precursor obtained in step (2) to the solution obtained in step (3), mix and stir evenly by the equal volume dipping method, use an ultrasonic cleaner for ultrasonic vibration for 40 minutes, and then dry it in an oven at 110 °C for 8 hours, and then place it in an oven. Calcined at 400℃ for 4h to obtain VWTiO 2 catalyst;

[0035] (5) calcining cerium oxide at 400℃ for 2h;

[0036] (6) C...

Embodiment 2

[0038] Compared with Example 1, the difference is that the content of cerium oxide is adjusted to 8%.

Embodiment 3

[0040] (1) Stir the ammonium metatungstate at a temperature of 50 °C to obtain a solution;

[0041] (2) Add TiO2 powder to the solution obtained in step (1), mix and stir evenly by the equal volume dipping method, ultrasonically vibrate for 40 minutes with an ultrasonic cleaner, then dry in an oven at 110 °C for 8 hours, and then calcine at 400 °C for 4 hours , making WO 3 / TiO 2 Precursor;

[0042] (3) Dissolve ammonium metavanadate in oxalic acid solution at a temperature of 60°C, adjust PH=2, and stir for 30min to obtain a solution;

[0043] (4) Add the precursor obtained in step (2) to the solution obtained in step (3), mix and stir evenly by the equal volume dipping method, use an ultrasonic cleaner for ultrasonic vibration for 40 minutes, and then dry it in an oven at 110 °C for 8 hours, and then place it in an oven. Calcined at 400℃ for 4h to obtain VWTiO 2 catalyst;

[0044] (5) calcining iron oxide at 400°C for 2h;

[0045] (6) Combine the pretreated iron oxide in...

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PUM

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Abstract

The invention discloses a flue gas denitrification catalyst with a wide activity temperature interval as well as a preparation method thereof. The flue gas denitrification catalyst comprises 65%-99.8% of carrier TiO2, 0.1%-10% of active component V2O5, 0.1%-10% of active component WO3 and 0.1%-15% of valence-variation metallic oxide. According to the invention, a ball mill is adopted for enabling the VWTiO2 catalyst and the valence-variation metal element oxide to be fully mixed mechanically, simplifies the technological process, reduces the energy consumption, and prevents the environment pollution; the prepared flue gas denitrification catalyst has a wide activity temperature interval and high capability of NOx removing activity and SO2 and H2O toxication resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a flue gas denitration catalyst with a wide active temperature range and a preparation method thereof. Background technique [0002] Nitrogen oxides can cause acid rain and photochemical smog, and are one of the main sources of air pollution. With the development of the power industry, the emission of nitrogen oxides has increased year by year, which has attracted great attention at home and abroad. Selective Catalytic Reduction (SCR) technology has become the mainstream technology in the world denitration market due to its efficient and reliable denitration performance. [0003] At present, commercial SCR flue gas denitration catalysts are generally VWTiO 2 or VMoTiO 2 , the temperature window of this type of catalyst is between 350 and 400 °C, while in practical applications, the flue gas temperature of industrial boilers is relatively low. If the SCR catalyst with a workin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01D53/90B01D53/56
Inventor 侯娜娜洪挺代永强王朋
Owner 北京宏庚环保科技有限公司
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