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Ammonium bisulfate poisoning prevention wide-temperature-range SCR (Selective Catalytic Reduction) catalyst taking fly ash as matrix as well as preparation method and application thereof

An SCR catalyst, ammonium hydrogen sulfate technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Industrial waste gas treatment conditions, difficult commercialization in the field of coal combustion, etc., to achieve high water resistance, sulfur resistance and denitration activity, solve catalyst poisoning, and improve the effect of flue gas denitration efficiency

Pending Publication Date: 2022-03-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, catalysts with Cu or Mn oxides as active components have good low-temperature NH 3 -SCR activity, but its active site is easily in SO 2 Severe chemical deactivation occurs due to sulfation in the environment, which ultimately makes this type of catalyst unable to adapt to the treatment conditions of most industrial waste gases
As another example, low-temperature catalysts based on Cu-based molecular sieves have better SO 2 Tolerance, but due to its complicated preparation method and regeneration temperature as high as 650°C, it cannot effectively alleviate the catalyst clogging and poisoning problems caused by ABS deposition, so it is difficult to achieve commercialization in the coal-fired field

Method used

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  • Ammonium bisulfate poisoning prevention wide-temperature-range SCR (Selective Catalytic Reduction) catalyst taking fly ash as matrix as well as preparation method and application thereof
  • Ammonium bisulfate poisoning prevention wide-temperature-range SCR (Selective Catalytic Reduction) catalyst taking fly ash as matrix as well as preparation method and application thereof
  • Ammonium bisulfate poisoning prevention wide-temperature-range SCR (Selective Catalytic Reduction) catalyst taking fly ash as matrix as well as preparation method and application thereof

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Embodiment 1

[0037] A wide temperature zone SCR catalyst for preventing ammonium bisulfate poisoning with fly ash as a substrate, the porous fly ash as a substrate, and a wide temperature zone SCR catalyst attached to the surface of the porous fly ash.

[0038] In this example, the wide temperature zone SCR catalyst is V-W-Mn / TiO 2 -SiO 2 catalyst. The V-W-Mn / TiO 2 -SiO 2 The catalyst is TiO 2 -SiO 2 Composite oxide as carrier, TiO 2 -SiO 2 The composite oxide is loaded with active component V, active component Mn and coagent W, wherein the active component V is V 2 o 5 , the active component Mn is MnO 2 , coagent W is WO 3 ; The V-W-Mn / TiO 2 -SiO 2 The mass fraction of the active component V in the catalyst is 1.096%, the mass fraction of the active component Mn is 5.019%, the mass fraction of the coagent W is 6.29%, and the rest is TiO 2 -SiO 2 Composite oxides; TiO 2 -SiO 2 SiO in composite oxide 2 The mole fraction is 20%.

[0039] A kind of preparation method of the ...

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Abstract

The invention discloses an ammonium bisulfate poisoning prevention wide-temperature-range SCR (Selective Catalytic Reduction) catalyst taking fly ash as a matrix as well as a preparation method and application thereof, the catalyst takes porous fly ash as the matrix, and the wide-temperature-range SCR catalyst is attached to the surface of the porous fly ash. The preparation method comprises the following steps: mixing the porous fly ash and the wide-temperature-range SCR catalyst, and grinding to obtain the catalyst. According to the ammonium bisulfate poisoning prevention wide-temperature-range SCR catalyst with the fly ash as the matrix, ammonium bisulfate poisoning can be effectively prevented within a wide temperature range, the use temperature range of the SCR catalyst is effectively widened, the catalyst is suitable for medium-low-temperature SCR denitration, regeneration is easy in the actual use process, recycling of the catalyst can be achieved without shutdown, and the catalyst is environmentally friendly and free of pollution. The method is high in use value and good in application prospect, and has very important significance for effectively improving the flue gas denitration efficiency of a coal-fired power plant. The preparation method of the catalyst has the advantages of simple process, convenience in operation and the like, does not need special equipment, and is easy to realize industrial production.

Description

technical field [0001] The invention belongs to the field of tail flue gas denitrification, and relates to a wide temperature zone SCR catalyst for preventing ammonium bisulfate poisoning with fly ash as a matrix, a preparation method and application thereof. Background technique [0002] Currently, NO in flue gas from coal-fired power plants x , usually using selective catalytic reduction denitrification (SCR) technology for removal, and often in a "high temperature + high dust" arrangement. With the adjustment of the energy structure, coal-fired power units will face heavier peak-shaving tasks, and their low-load operation and deep peak-shaving will become the norm. Using SCR technology to remove NO in flue gas of coal-fired power plant x When using commercial denitration catalysts, such as V-W / Ti-based SCR catalysts, the operating temperature range is 320-420°C. When the coal-fired power unit operates at low load, the SCR inlet flue temperature is lower than the cataly...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01D53/8628
Inventor 卿梦霞王朝曦张林林刘燊刘亮张巍尹艳山
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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