CN104353452A - Metatitanic acid SCR (selective catalytic reduction) denitration catalyst and preparation method thereof - Google Patents
Metatitanic acid SCR (selective catalytic reduction) denitration catalyst and preparation method thereof Download PDFInfo
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- CN104353452A CN104353452A CN201410616027.3A CN201410616027A CN104353452A CN 104353452 A CN104353452 A CN 104353452A CN 201410616027 A CN201410616027 A CN 201410616027A CN 104353452 A CN104353452 A CN 104353452A
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Abstract
The invention belongs to the field of catalysts and in particular relates to a metatitanic acid SCR (selective catalytic reduction) denitration catalyst and a preparation method thereof. The metatitanic acid SCR denitration catalyst is prepared by calcining a mixture of a titanium source, a vanadium source and water, wherein the titanium source comprises metatitanic acid, and the mass ratio of the titanium source to the vanadium source is (35-75) to (0.1-5). According to the metatitanic acid SCR denitration catalyst, metatitanic acid is added in a preparation process of the SCR denitration catalyst, so that the specific surface area of an SCR denitration catalyst product is enlarged and the denitration efficiency of the SCR denitration catalyst during flue gas denitration is improved; the experimental result shows that the specific surface area of the SCR denitration catalyst is more than 90 m<2>/g and the denitration efficiency of the SCR denitration catalyst during flue gas denitration is higher than 85%.
Description
Technical field
The invention belongs to catalyst field, particularly relate to a kind of metatitanic acid SCR denitration and preparation method thereof.
Background technology
Current NH
3sCR removes NO
xthe feature such as method (SCR), technology maturation high with efficiency, be at home and abroad used widely, the catalyst adopted is mainly V2O
5/ TiO
2catalyst based.Because coal-fired flue-gas has high dust quantity and high flow capacity, industrial denitrating catalyst is generally structured form, comprises honeycomb fashion, board-like and corrugated.Because board-like catalyst has antidusting ability by force, be more suitable for the situation of the many ashes of China's coal-fired flue-gas.Compared with honeycomb fashion, the passage of board-like catalyst is large, and pressure drop is low, and anti-poisoning capability is strong, and owing to having metallic framework, intensity is higher simultaneously, but due to the active component of its specific surface area few, therefore catalyst amount is larger.In the preparation process of catalyst, the change etc. of support, active component and shaping assistant use amount all can have impact to the activity of catalyst and mechanical performance.Wherein, carrier mainly carries active component and co-catalyst, and its physicochemical properties decide active component in the dispersiveness of catalyst surface and stability, and then affect the denitration activity of monoblock type SCR denitration.
In SCR denitration preparation process, the most frequently used carrier is titanium dioxide (TiO
2), but use titanium dioxide to there is as the SCR denitration that carrier obtains the problem that specific area is little, denitration efficiency is low at present.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of metatitanic acid SCR denitration and preparation method thereof, metatitanic acid SCR denitration specific area provided by the invention is large, and denitration efficiency is high.
The invention provides a kind of metatitanic acid SCR denitration, obtained through calcining by the mixture of titanium source, vanadium source and water; Described titanium source comprises metatitanic acid; The mass ratio in described titanium source and vanadium source is 35 ~ 75:0.1 ~ 5.
Preferably, described titanium source also comprises titanium dioxide.
Preferably, the mass ratio of described metatitanic acid and titanium dioxide is 20 ~ 60:35 ~ 5.
Preferably, described vanadium source is ammonium metavanadate.
Preferably, described mixture also comprises tungsten source and/or molybdenum source.
Preferably, described tungsten source is ammonium metatungstate; Described molybdenum source is ammonium heptamolybdate.
Preferably, described mixture also comprises one or more in lubricant, thickener, fibre framework materials and alkali.
Preferably, the water content of described mixture is 20 ~ 50wt%.
The invention provides a kind of preparation method of metatitanic acid SCR denitration, comprise the following steps:
A), by titanium source, vanadium source and water mixing, mixture is obtained;
Described titanium source comprises metatitanic acid;
B), described mixture calcines, and obtains metatitanic acid SCR denitration.
Preferably, the temperature of described calcining is 400 ~ 600 DEG C; The time of described calcining is 6 ~ 8h.
Compared with prior art, the invention provides a kind of metatitanic acid SCR denitration and preparation method thereof.Metatitanic acid SCR denitration provided by the invention, obtained through calcining by the mixture of titanium source, vanadium source and water; Described titanium source comprises metatitanic acid; The mass ratio in described titanium source and vanadium source is 35 ~ 75:0.1 ~ 5.SCR denitration provided by the invention with the addition of metatitanic acid in preparation process, thus improves the specific area of SCR denitration goods, and then improves denitration efficiency when adopting this SCR denitration to carry out denitrating flue gas.Experimental result shows, the specific area of SCR denitration provided by the invention is greater than 90m
2/ g, when adopting this SCR denitration to carry out denitrating flue gas, denitration efficiency is higher than 85%.
Detailed description of the invention
Be clearly and completely described the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of metatitanic acid SCR denitration, obtained through calcining by the mixture of titanium source, vanadium source and water; Described titanium source comprises metatitanic acid; The mass ratio in described titanium source and vanadium source is 35 ~ 75:0.1 ~ 5.
Metatitanic acid SCR denitration provided by the invention is obtained through calcining by the mixture of titanium source, vanadium source and water.Wherein, described titanium source comprises metatitanic acid.In the present invention, the metatitanic acid used when preparing said mixture is preferably metatitanic acid pressed powder, and the specific area of described metatitanic acid pressed powder is preferably greater than 200m
2/ g, is more preferably 227.15 ~ 250m
2/ g.The source of described metatitanic acid pressed powder can be commercially available, also can prepare according to following steps:
Metatitanic acid and water mixing, the meta-titanium acid solution be mixed to get through filtration washing and centrifugal, obtains metatitanic acid filter cake successively.Described metatitanic acid filter cake, through pulverizing successively and drying, obtains metatitanic acid pressed powder.Wherein, the mass concentration of described meta-titanium acid solution is preferably 10 ~ 20wt%, is more preferably 13 ~ 15wt%.The solid content of described metatitanic acid filter cake is preferably 30 ~ 50wt%, is more preferably 45 ~ 48wt%.
In the present invention, described titanium source preferably also comprises titanium dioxide.In the present invention, the titanium dioxide used when preparing said mixture is preferably titanium dioxide solids powder, and the specific area of described titanium dioxide solids powder is preferably 300 ~ 400m
2/ g, is more preferably 340 ~ 360m
2/ g.The source of the present invention to described titanium dioxide solids powder is not particularly limited, commercially available.The mass ratio of described metatitanic acid and titanium dioxide is preferably 20 ~ 60:35 ~ 5, is more preferably 25 ~ 55:20 ~ 10, most preferably is 35 ~ 45:20 ~ 10.
In the present invention, described vanadium source is preferably ammonium metavanadate.The quality in described titanium source and vanadium source, preferably than being 35 ~ 75:0.1 ~ 5, being more preferably 35 ~ 55:0.5 ~ 2, most preferably being 40 ~ 55:1 ~ 2.
In the present invention, the effect of described water is the stickiness controlling mixture.The water content of described mixture is preferably 20 ~ 50wt%, is more preferably 25 ~ 35wt%, most preferably is 30 ~ 35wt%.
In the present invention, described mixture preferably also comprises tungsten source and/or molybdenum source.Described tungsten source is preferably ammonium metatungstate.The mass ratio in described tungsten source and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 3 ~ 5:40 ~ 55.Described molybdenum source is preferably ammonium heptamolybdate.The mass ratio in described molybdenum source and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 3 ~ 5:40 ~ 55.
In the present invention, described mixture preferably also comprise in lubricant, thickener, fibre framework materials and alkali one or more, more preferably comprise lubricant, thickener, fibre framework materials and alkali.Described lubricant is preferably stearic acid.The mass ratio in described lubricant and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 2 ~ 3:40 ~ 55.Described thickener is preferably lactic acid.The mass ratio in described thickener and titanium source is preferably 0.5 ~ 5:35 ~ 75, is more preferably 1 ~ 2:35 ~ 55, most preferably is 1 ~ 2:40 ~ 55.Described fibre framework materials is preferably glass fibre.The mass ratio in described fibre framework materials and titanium source is preferably 0.5 ~ 10:35 ~ 75, is more preferably 1 ~ 3:35 ~ 55, most preferably is 2 ~ 3:40 ~ 55.Described alkali is preferably ammoniacal liquor, and in the present invention, the object of adding alkali is in the mixture the pH value in order to regulate mixture, and the pH value of described mixture is preferably 7.5 ~ 10, is more preferably 8 ~ 10, most preferably is 8.4.
Metatitanic acid SCR denitration specific area provided by the invention is large, and denitration efficiency is high.Experimental result shows, the specific area of SCR denitration provided by the invention is greater than 90m
2/ g, when adopting this SCR denitration to carry out denitrating flue gas, denitration efficiency is higher than 85%.
The invention provides a kind of preparation method of metatitanic acid SCR denitration, comprise the following steps:
A), by titanium source, vanadium source and water mixing, mixture is obtained;
Described titanium source comprises metatitanic acid;
B), described mixture calcines, and obtains metatitanic acid SCR denitration.
In the present invention, first by titanium source, vanadium source and water mixing.Described titanium source comprises metatitanic acid, and described titanium source preferably also comprises titanium dioxide.The mass ratio of described metatitanic acid and titanium dioxide is preferably 20 ~ 60:35 ~ 5, is more preferably 25 ~ 55:20 ~ 10, most preferably is 35 ~ 45:20 ~ 10.The mass ratio of described titanium source and water is preferably 35 ~ 75:20, is more preferably 35 ~ 55:20, most preferably is 40 ~ 55:20.The quality in described titanium source and vanadium source, preferably than being 35 ~ 75:0.1 ~ 5, being more preferably 35 ~ 55:0.5 ~ 2, most preferably being 40 ~ 55:1 ~ 2.The detailed process that described titanium source, vanadium source and water mix is preferably:
First by titanium source and water mixing.The mode of described titanium source and water mixing is preferably and stirs; The time of described titanium source and water mixing is preferably 5 ~ 60min, is more preferably 20 ~ 30min.Then mixed system titanium source and water formed and the mixing of vanadium source.The mixed system of described titanium source and water composition and the mode of vanadium source mixing are preferably and stir; The mixed system of described titanium source and water composition and the time of vanadium source mixing are preferably 5 ~ 60min, are more preferably 10 ~ 20min.
In the present invention, before described titanium source and water mix, preferably first titanium source is mixed with tungsten source and/or molybdenum source.The mass ratio in described tungsten source and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 3 ~ 5:40 ~ 55; The mass ratio in described molybdenum source and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 3 ~ 5:40 ~ 55.The time that described titanium source mixes with tungsten source and/or molybdenum source is preferably 5 ~ 60min, is more preferably 5 ~ 30min, most preferably is 5 ~ 10min.
In the present invention, after the mixed system of described titanium source and water composition and vanadium source mix, preferably the mixed system be mixed to get is mixed with one or more in lubricant, thickener, fibre framework materials and alkali, more preferably mixed system is mixed with lubricant, thickener, fibre framework materials and alkali.The mass ratio in described lubricant and titanium source is preferably 1 ~ 10:35 ~ 75, is more preferably 2 ~ 5:35 ~ 55, most preferably is 2 ~ 3:40 ~ 55; The mass ratio in described thickener and titanium source is preferably 0.5 ~ 5:35 ~ 75, is more preferably 1 ~ 2:35 ~ 55, most preferably is 1 ~ 2:40 ~ 55; The mass ratio in described fibre framework materials and titanium source is preferably 0.5 ~ 10:35 ~ 75, is more preferably 1 ~ 3:35 ~ 55, most preferably is 2 ~ 3:40 ~ 55.The addition of described alkali is relevant with the pH value of mixed system, preferably controlling the pH value of mixed system 7.5 ~ 10, being more preferably 8 ~ 10, most preferably being 8.4 by adding alkali.In certain embodiments of the present invention, the detailed process that the mixed system that titanium source, vanadium source and water form mixes with lubricant, thickener, fibre framework materials and alkali is preferably:
First the mixed system that titanium source, vanadium source and water form is mixed with alkali.The mode that the mixed system that described titanium source, vanadium source and water form mixes with alkali preferably stirs; The time that the mixed system that described titanium source, vanadium source and water form mixes with alkali is preferably 5 ~ 60min; Be more preferably 10 ~ 20min.After the mixed system that titanium source, vanadium source and water form mixes with alkali, the mixed system that titanium source, vanadium source, alkali and water form is mixed with lubricant and thickener.The mode that the mixed system that described titanium source, vanadium source, alkali and water form mixes with lubricant and thickener preferably stirs; The time that the mixed system that described titanium source, vanadium source, alkali and water form mixes with lubricant and thickener is preferably 5 ~ 60min, is more preferably 10 ~ 20min.After the mixed system that titanium source, vanadium source, alkali and water form mixes with lubricant and thickener, the mixed system that titanium source, vanadium source, alkali, lubricant, thickener and water form is mixed with fibre framework materials.The mode that the mixed system that described titanium source, vanadium source, alkali, lubricant, thickener and water form mixes with fibre framework materials preferably stirs; The time that the mixed system that described titanium source, vanadium source, alkali, lubricant, thickener and water form mixes with fibre framework materials is preferably 5 ~ 60min, is more preferably 10 ~ 20min.After the mixed system of described titanium source, vanadium source, alkali, lubricant, thickener and water composition mixes with fibre framework materials and terminates, preferably in the mixed system be mixed to get, add water.In the present invention, the object adding water in mixed system is diluted mixed system, impels the more even of each component mixing in mixed system.
The equipment used when the present invention mixes raw material is not particularly limited, and is preferably mixing roll.Mixing roll carries out hydrofuge to mixture in raw material mixed process, thus controls the moisture of mixture.In the present invention, preferably the moisture of mixture is controlled at 20 ~ 50wt%, more preferably control at 25 ~ 35wt%, most preferably control at 30 ~ 35wt%.
After mixing terminates, the mixture be mixed to get is calcined.The temperature of described calcining is preferably 400 ~ 600 DEG C, is more preferably 520 ~ 600 DEG C; The time of described calcining is preferably 6 ~ 8h.After calcining terminates, obtain metatitanic acid SCR denitration.
Preparation method provided by the invention, with the addition of metatitanic acid in the preparation process of SCR denitration, thus improves the specific area of SCR denitration goods, and then improves denitration efficiency when adopting this SCR denitration to carry out denitrating flue gas.Experimental result shows, the specific area of the SCR denitration adopting method provided by the invention to prepare is greater than 90m
2/ g, when the SCR denitration adopting method provided by the invention to prepare carries out denitrating flue gas, denitration efficiency is higher than 85%.
For the purpose of clearer, be described in detail below by following examples.
Embodiment 1
Prepare metatitanic acid pressed powder
50 weight portion metatitanic acids mix with water, the metatitanic acid aqueous solution of obtained 15wt%, the described metatitanic acid aqueous solution successively through filtration washing and centrifugal after obtain metatitanic acid filter cake, the solid content of described metatitanic acid filter cake is 46.24wt%.Metatitanic acid filter cake is successively through pulverizing and obtaining metatitanic acid pressed powder after drying, and the specific area of described metatitanic acid pressed powder is 227.15m
2/ g.
Embodiment 2
By 10 parts by weight of titanium dioxide (specific area 340 ~ 360m
2/ g), the obtained metatitanic acid pressed powder of 45 parts of parts by weight of example 1 and 3 weight portion ammonium heptamolybdates drop into mixing roll, are dry mixed 10min.Add 20 parts by weight of deionized water, stir 20min.Add 1 weight portion ammonium metavanadate, stir 20min.Add 2 weight portion ammoniacal liquor, stir 20min.Add 2 weight portion stearic acid and 2 weight portion lactic acid, stir 20min.Add 2 parts by weight of glass fiber, stir 20min.Finally add 15 parts by weight of deionized water, reverse agitating function mixes, and hydrofuge, obtains mixture.The moisture of described mixture is 30wt%, and pH value is 8.4.Described mixture calcines 6h at 520 DEG C, obtains metatitanic acid SCR denitration.
Embodiment 3
By 20 parts by weight of titanium dioxide (specific area 340 ~ 360m
2/ g), the obtained metatitanic acid pressed powder of 35 parts of parts by weight of example 1 and 3 weight portion ammonium heptamolybdates drop into mixing roll, are dry mixed 10min.Add 20 parts by weight of deionized water, stir 20min.Add 1 weight portion ammonium metavanadate, stir 20min.Add 2 weight portion ammoniacal liquor, stir 20min.Add 2 weight portion stearic acid and 2 weight portion lactic acid, stir 20min.Add 2 parts by weight of glass fiber, stir 20min.Finally add 15 parts by weight of deionized water, reverse agitating function mixes, and hydrofuge, obtains mixture.The moisture of described mixture is 30wt%, and pH value is 8.4.Described mixture calcines 6h at 520 DEG C, obtains metatitanic acid SCR denitration.
Embodiment 4
By 15 parts by weight of titanium dioxide (specific area 340 ~ 360m
2/ g), the obtained metatitanic acid pressed powder of 40 parts of parts by weight of example 1 and 3 weight portion ammonium metatungstates drop into mixing roll, are dry mixed 10min.Add 20 parts by weight of deionized water, stir 20min.Add 1 weight portion ammonium metavanadate, stir 20min.Add 2 weight portion ammoniacal liquor, stir 20min.Add 2 weight portion stearic acid and 2 weight portion lactic acid, stir 20min.Add 2 parts by weight of glass fiber, stir 20min.Finally add 15 parts by weight of deionized water, reverse agitating function mixes, and hydrofuge, obtains mixture.The moisture of described mixture is 30wt%, and pH value is 8.4.Described mixture calcines 6h at 520 DEG C, obtains metatitanic acid SCR denitration.
Comparative example
By 55 parts by weight of titanium dioxide (specific area 340 ~ 360m
2/ g) and 3 weight portion ammonium heptamolybdates input mixing roll, be dry mixed 10min.Add 20 parts by weight of deionized water, stir 20min.Add 1 weight portion ammonium metavanadate, stir 20min.Add 2 weight portion ammoniacal liquor, stir 20min.Add 2 weight portion stearic acid and 2 weight portion lactic acid, stir 20min.Add 2 parts by weight of glass fiber, stir 20min.Finally add 15 parts by weight of deionized water, reverse agitating function mixes, and hydrofuge, obtains mixture.The moisture of described mixture is 30wt%, and pH value is 8.4.Described mixture calcines 6h at 520 DEG C, obtains SCR denitration.
Embodiment 5
Specific surface area of catalyst and denitration performance test
Specific area test is carried out to the denitrating catalyst product that embodiment 2 ~ 4 and comparative example obtain, and carry out denitration efficiency test in simulated flue gas.Wherein, the component of simulated flue gas is: C
nOx=C
nH3=0.045%, C
hg=40 μ g/L, C
o2≈ 4.8%, C
h2O≈ 6.0%, C
sO2≈ 0.05%, C
cO2≈ 12%, C
hClthe N of ≈ 0.002% and surplus
2; The air speed of simulated flue gas is 20000m
3/ h; The temperature of simulated flue gas is 350 DEG C.Test result is as shown in table 1.
Table 1
Can be found out by table 1, in the preparation process of SCR denitration, use metatitanic acid Substitute For Partial titanium dioxide, the specific area of SCR denitration goods can be improved, and then improve denitration efficiency when SCR denitration carries out denitrating flue gas.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a metatitanic acid SCR denitration, obtained through calcining by the mixture of titanium source, vanadium source and water; Described titanium source comprises metatitanic acid; The mass ratio in described titanium source and vanadium source is 35 ~ 75:0.1 ~ 5.
2. catalyst according to claim 1, is characterized in that, described titanium source also comprises titanium dioxide.
3. catalyst according to claim 2, is characterized in that, the mass ratio of described metatitanic acid and titanium dioxide is 20 ~ 60:35 ~ 5.
4. catalyst according to claim 1, is characterized in that, described vanadium source is ammonium metavanadate.
5. catalyst according to claim 1, is characterized in that, described mixture also comprises tungsten source and/or molybdenum source.
6. catalyst according to claim 5, is characterized in that, described tungsten source is ammonium metatungstate; Described molybdenum source is ammonium heptamolybdate.
7. catalyst according to claim 1, is characterized in that, described mixture also comprise in lubricant, thickener, fibre framework materials and alkali one or more.
8. the catalyst according to any one of claim 1 ~ 7, is characterized in that, the water content of described mixture is 20 ~ 50wt%.
9. a preparation method for metatitanic acid SCR denitration, comprises the following steps:
A), by titanium source, vanadium source and water mixing, mixture is obtained;
Described titanium source comprises metatitanic acid;
B), described mixture calcines, and obtains metatitanic acid SCR denitration.
10. preparation method according to claim 9, is characterized in that, the temperature of described calcining is 400 ~ 600 DEG C; The time of described calcining is 6 ~ 8h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521644A (en) * | 2022-10-14 | 2022-12-27 | 潮州市索力德机电设备有限公司 | Degradable oxynitride coating and preparation method and application thereof |
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| CN102357359A (en) * | 2011-11-05 | 2012-02-22 | 安徽工业大学 | Method for preparing denitration catalyst |
| CN102489294A (en) * | 2011-12-22 | 2012-06-13 | 国电科学技术研究院 | Low-temperature SCR catalyst prepared by extrusion molding, and preparation method thereof |
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| CN115521644A (en) * | 2022-10-14 | 2022-12-27 | 潮州市索力德机电设备有限公司 | Degradable oxynitride coating and preparation method and application thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150218 |