Low-temperature SCR denitration catalyst and preparation method thereof

A denitrification catalyst and low-temperature technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of denitrification efficiency decline, increase power plant benefits, stabilize denitrification activity, and improve stability sexual effect

Inactive Publication Date: 2017-03-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, activated coke also has the effect of adsorbing sulfur dioxide during the denitrification process, which may easily lead to a decrease in denitrification efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the first step, the catalyst composite carrier is prepared

[0021] Wash fly ash three times with deionized water at a solid-to-liquid ratio of 1:10, dry at 105°C, mix with 2 mol / L acetic acid at a solid-to-liquid mass ratio of 1:2, stir for 1 hour, let stand for 3 hours, and filter Remove the upper solution. Prepare pickling fly ash slurry, add appropriate amount of deionized water to the slurry and stir, filter the supernatant after centrifugation until the pH of the supernatant is 6-7, take the filtered solid, and place it in a drying box drying to obtain pretreated fly ash; mix the pretreated fly ash and nano-titanium dioxide in a mass ratio of 5:1 and pour it into a certain amount of deionized water, stir evenly, put it into a drying box for drying, and prepare A composite carrier of fly ash and nano-titanium dioxide was obtained. (The following uses FA-TiO 2 Carrier abbreviation, where FA is the abbreviation of fly ash, TiO 2 It is referred to as nano-titan...

Embodiment 2

[0026] In the first step, the catalyst composite carrier is prepared

[0027] Wash fly ash three times with deionized water at a solid-to-liquid ratio of 1:10, dry at 110°C, mix with 2.5mol / L acetic acid at a solid-to-liquid mass ratio of 1:2, stir for 0.5h and then let stand for 2h , remove the upper layer solution by filtration. Prepare pickling fly ash slurry, add appropriate amount of deionized water to the slurry and stir, filter the supernatant after centrifugation until the pH of the supernatant is 6-7, take the filtered solid, and place it in a drying box drying to obtain pretreated fly ash; mix the pretreated fly ash and nano-titanium dioxide in a mass ratio of 3:1 and pour them into a certain amount of deionized water, stir evenly, put them into a drying box for drying, and prepare A composite carrier of fly ash and nano-titanium dioxide was obtained.

[0028] In the second step, the catalyst active component load

[0029] 5% of manganese, 7.28% of cerium, 5% of v...

Embodiment 3

[0032] In the first step, the catalyst composite carrier is prepared

[0033] Wash fly ash three times with deionized water at a solid-to-liquid ratio of 1:10, dry at 100°C, mix with 1.5mol / L acetic acid at a solid-to-liquid mass ratio of 1:2, stir for 2 hours and then let it stand for 1 hour. The upper layer solution was removed by filtration. Prepare pickling fly ash slurry, add appropriate amount of deionized water to the slurry and stir, filter the supernatant after centrifugation until the pH of the supernatant is 6-7, take the filtered solid, and place it in a drying box drying to obtain pretreated fly ash; mix the pretreated fly ash and nano-titanium dioxide in a mass ratio of 4:1 and pour them into a certain amount of deionized water, stir evenly, put them into a drying box for drying, and prepare A composite carrier of fly ash and nano-titanium dioxide was obtained.

[0034] In the second step, the catalyst active component load

[0035] 3.66% of manganese, 9.34% of ...

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PUM

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Abstract

The invention provides a low-temperature SCR denitration catalyst and a preparation method thereof. The catalyst can be used for a low-temperature nitric oxide selectivity catalytic reduction reaction. The catalyst adopts manganese, cerium, vanadium and tungsten oxides as active components and adopts a coal ash and nanometer titania mixture as a compound carrier. The preparation method of the catalyst comprises the steps that coal ash is subjected to washing, drying and acid-pickling and then mixed with the nanometer titania into a quantity of deionized water, and stirring and drying are performed to obtain the composite carrier. The manganese nitrate, cerium nitrate, ammonium metavanadate and ammonium tungstate are dissolved into deionized water, the prepared composite carrier is added, and stirring, standing, drying, grinding, calcination, roasting and other processes are performed to prepare the finished catalyst. The needed raw materials are cheap and easy to obtain, the cost is obviously lowered, and the denitration performance under the low temperature condition is good.

Description

technical field [0001] The invention relates to a denitrification catalyst, in particular to a low-temperature SCR denitrification catalyst loaded with fly ash and nano-titanium dioxide composite carrier, manganese, cerium, vanadium and tungsten composite oxides and a preparation method thereof, belonging to air pollution in the field of environmental protection field of material control. Background technique [0002] Nitrogen oxides (NO X ) is NO, NO 2 , N 2 O, N 2 o 5 , N 2 o 4 and N 2 o 3 A general term for nitrogen oxides. The main hazards of nitrogen oxides are photochemical smog, holes in the ozone layer, acid rain, etc., which pollute the atmosphere and endanger human health. Nitrogen oxides in the atmosphere mainly come from three sources: nitrogen oxides produced by nature, nitrogen oxides produced by industrial production, and nitrogen oxides produced by motor vehicle exhaust. Taking the emission of nitrogen oxides in 2014 as an example, the total emissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/34B01J2523/00B01J2523/3712B01J2523/55B01J2523/69B01J2523/72
Inventor 苟湘徐国有王雅婷甄子毅王恩宇刘联胜吴晋湘
Owner HEBEI UNIV OF TECH
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