Non-metal doped low-temperature SCR catalyst and preparation method thereof

A technology of SCR catalyst and non-metallic element, applied in the field of low-temperature SCR catalyst doped with non-metallic element and its preparation, can solve the problems of catalyst erosion and poisoning, affecting the service life, narrow reaction temperature window, etc., to improve the low-temperature activity, Long service life, good low temperature activity

Inactive Publication Date: 2018-06-05
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts are basically based on V 2 o 5 As an active component, TiO 2 as a carrier, and then adding WO 3 or MoO 3 As a co-catalyst, the catalyst temperature is about 300℃~350℃, and the reaction temperature window is relatively narrow, which belongs to the medium-high temperature catalyst. Therefore, the SCR reactor is generally placed before the dust collector, but the undusted flue gas will have a strong impact on the catalyst. Corrosion and poisoning, affecting service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A low-temperature SCR catalyst doped with non-metallic elements, the contents of each component of the catalyst are:

[0028] Carrier, titanium dioxide is 84wt%;

[0029] Active component, vanadium pentoxide is 5wt%; Ceria is 5wt%;

[0030] Auxiliary agent, tungsten trioxide is 5wt%;

[0031] Doping element, 0.5wt% of fluorine element; 0.5wt% of sulfur element.

[0032] A method for preparing the above-mentioned low-temperature SCR catalyst doped with non-metal elements, comprising the steps of:

[0033] 1) Dissolve ethanolamine in deionized water, add ammonium metavanadate and stir to dissolve at 60°C; prepare solution A; according to the mass conservation of vanadium element, the amount of ammonium metavanadate added is based on the pentoxide in the finished catalyst The content of vanadium is calculated;

[0034] 2) Mixing: mix titanium dioxide, cerium dioxide, ammonium tungstate, ammonium fluoride, thiourea, stearic acid, lactic acid, and water, stir for 10 minu...

Embodiment 2

[0046] A low-temperature SCR catalyst doped with non-metallic elements, the contents of each component of the catalyst are:

[0047] Carrier, titanium dioxide is 86wt%;

[0048] Active component, vanadium pentoxide is 3wt%; Ceria is 4wt%;

[0049] Auxiliary agent, tungsten trioxide is 5wt%;

[0050] Doping elements, fluorine element is 1wt%; sulfur element is 1wt%.

[0051] A method for preparing the above-mentioned low-temperature SCR catalyst doped with non-metal elements, comprising the steps of:

[0052] 1) Dissolve ethanolamine in deionized water, add ammonium metavanadate and stir to dissolve at 70°C; prepare solution A; according to the mass conservation of vanadium element, the amount of ammonium metavanadate added is based on the pentoxide in the finished catalyst The content of vanadium is calculated;

[0053]2) Mixing: mix titanium dioxide, cerium dioxide, ammonium tungstate, ammonium fluoride, thiourea, stearic acid, lactic acid, and water, stir for 20 minutes,...

Embodiment 3

[0065] A low-temperature SCR catalyst doped with non-metallic elements, the contents of each component of the catalyst are:

[0066] Carrier, titanium dioxide is 85wt%;

[0067] Active component, vanadium pentoxide is 2wt%; Ceria is 3wt%;

[0068] Auxiliary agent, tungsten trioxide is 7wt%;

[0069] Doping elements, fluorine element is 2wt%; sulfur element is 1wt%.

[0070] A method for preparing the above-mentioned low-temperature SCR catalyst doped with non-metal elements, comprising the steps of:

[0071] 1) Dissolve ethanolamine in deionized water, add ammonium metavanadate and stir to dissolve at 80°C; prepare solution A; according to the mass conservation of vanadium, the amount of ammonium metavanadate added is based on the amount of pentoxide in the finished catalyst The content of vanadium is calculated;

[0072] 2) Mixing: mix titanium dioxide, cerium dioxide, ammonium tungstate, ammonium fluoride, thiourea, stearic acid, lactic acid, and water, stir for 30 minut...

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Abstract

The invention relates to a non-metal doped low-temperature SCR catalyst which separately comprises the following components in percentage by weight: 84-86wt% of a carrier titanium dioxide, active ingredients: 2-5wt% of vanadium pentoxide and 3-5wt% of ceric oxide, 5-7wt% of an auxiliary agent tungsten trioxide and doped elements: 0.4-2wt% of fluorine and 0.4-2wt% of sulfur. The invention also provides a preparation method of the catalyst. By doping non-metal elements fluorine and sulfur into the SCR catalyst, the low-temperature activity of the catalyst can be improved, so that a denitration device can be directly mounted behind a dust collector for a low-temperature denitration catalyst, or even behind a desulfurizing device, so that on the one hand, the catalyst poisoning probability isreduced and the service life is prolonged, and on the other hand, the flue gas repeated heating step is reduced, so that the cost is lowered.

Description

technical field [0001] The invention relates to the field of SCR catalysts, in particular to a low-temperature SCR catalyst doped with non-metal elements and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO X ) is one of the main air pollutants, which will form acid rain, photochemical smog, destroy the ozone layer, and affect the ecological environment. There are two main sources of nitrogen oxides in the atmosphere, mobile sources and stationary sources. At present, CO and CH in exhaust gas are mainly used for mobile sources X , under the action of the three-way catalyst, the NO in the exhaust gas X Reduction to nitrogen and removal. NO emissions from stationary sources X The most effective solution is NH 3 Selective Catalytic Reduction (SCR), which is a reducing agent, has the advantages of high denitrification efficiency and mature technology. Catalysts are basically based on V 2 o 5 As an active component, TiO 2 as a carrier, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 林荣贵胡建锋吴新谦吴晓东林啟维陈勇温明英
Owner LONGYAN ZIJIN INNOVATION RES INST
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