CN107126949B - A kind of SCR denitration and preparation method thereof of anti-arsenic poisoning - Google Patents
A kind of SCR denitration and preparation method thereof of anti-arsenic poisoning Download PDFInfo
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Abstract
The invention discloses a kind of SCR denitrations and preparation method thereof of anti-arsenic poisoning, the SCR denitration ingredient is on the basis of titanium dioxide, it is basic active component with vanadic anhydride, molybdenum trioxide, increase bismuth auxiliary agent or indium auxiliary agent as anti-arsenic auxiliary agent, the structural promoter of resistance to arsenic poisoning is added simultaneously, and the structural promoter is calcium auxiliary agent and tin auxiliary agent；Coagent can protect basic active component, effectively prevent its inactivation under the conditions of arsenical fume；Structural promoter can prevent arsenic in the deposition and aggregation on SCR denitration surface, inhibit the poisoning of arsenical fume depth, the anti-arsenic poisoning ability of SCR denitration is improved, SCR denitration produced by the present invention keeps higher denitration efficiency, and extends the service life of SCR denitration.
Description
Technical field
The invention belongs to catalyst technical fields, and in particular to a kind of SCR denitration and its preparation of anti-arsenic poisoning
Method.
Background technique
Nitrogen oxides (NOx) is to cause one of acid rain, photochemical fog, Air Pollutants of depletion of the ozone layer, right
Human health and ecological environment generate serious harm.Wherein, with NH3It is current for the Selective Catalytic Reduction of NO x of reducing agent
The most mature denitration technology of most widely used, technology.
Currently, widely used denitrating catalyst is honeycomb commercialization V2O5-WO3/TiO2Base catalyst or V2O5- MoO3/
TiO2Base catalyst.When in use, temperature environment is 300 ~ 420 DEG C to denitrating catalyst, most of to be arranged as high dust-laden, catalyst
It is in for a long time containing in the flue gases such as flying dust, SOx, alkali metal (K, Na etc.) and Hg, As, easily catalyst poisoning is caused to inactivate.Its
In, arsenic poisoning is to cause one of common cause of catalyst inactivation, and arsenic content changes greatly in coal quality, and content is in 0.5 ~ 80 μ g/
g.If the mass fraction of arsenic in coal is more than 3 × 10-6, the SCR denitration service life will reduce by 30% or so.
Research is thought both at home and abroad: gaseous state arsenic (As in flue gas2O3) molecule be easier to enter catalyst microvoid, with catalyst
The reaction of active material vanadium generates stable arsenic acid vanadium, so that catalyst activity reduces.Gaseous state arsenic blocking catalyst micropore, resistance
Only reactant reaches active sites.The prior art generally uses method physically or chemically, reduces coal ash in the coal combustion stage
In As amount of element, while improving the physicochemical characteristics of denitrating catalyst, change denitrating catalyst surface acid site, or use
Molybdenum oxide improves the resistance to arsenic ability of catalyst as co-catalyst.
Summary of the invention
The purpose of the present invention is to provide a kind of SCR denitrations of anti-arsenic poisoning, and denitration in the prior art is overcome to urge
Agent catalyst denitration efficiency in arsenical fume reduces the problem very fast, activity is poor, the service life is short.
The present invention also provides the preparation methods of the SCR denitration of above-mentioned anti-arsenic poisoning.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and anti-arsenic auxiliary agent are mixed, obtains activated feedstock；Wherein, the anti-arsenic auxiliary agent is bismuth
Auxiliary agent or indium auxiliary agent；When anti-arsenic auxiliary agent is bismuth auxiliary agent, the mass ratio of vanadium, molybdenum element and bismuth element is in activated feedstock
0.05 ~ 0.85:3.33 ~ 6.67:1.79 ~ 5.83；When anti-arsenic auxiliary agent is indium auxiliary agent, vanadium in activated feedstock, molybdenum element and
The mass ratio of phosphide element is 0.05 ~ 0.85:3.33 ~ 6.67:1.65 ~ 5.38；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2 ~ 4, it is grinding, dry, in 400 ~
600 DEG C are calcined 4 ~ 6 hours, and active powder material is obtained；
(3) preparation mixing pug, the mixing pug are mixed according to parts by weight by following raw material: step (1) institute
Obtain 7 ~ 17 parts of active powder material, 10 ~ 18 parts of structural promoter, 0.1 ~ 0.5 part of tung oil, 1 ~ 3 part of silica solution, methylcellulose 0.05 ~ 0.1
Part, 2 ~ 6 parts of glass fibre, 59 ~ 81 parts of titanium dioxide, 45 ~ 55 parts of water；Wherein, the structural promoter is by calcium auxiliary agent and tin auxiliary agent
It mixes and obtains according to mass ratio 1:1 ~ 5；
(4) pug kneading, vacuum pugging will be mixed, after room temperature is aged 12 ~ 24 hours, vacuum extruding obtains honeycomb base
Material；
(5) will honeycomb blank obtained by step (4) it is dry after, calcined in 400 ~ 600 DEG C 24 ~ 36 hours to get.
Preferably, bismuth auxiliary agent described in step (1) is one of bismuth oxide, bismuth nitrate, bismuth sulfate and bismuth chloride or two
Kind or more.
Preferably, indium auxiliary agent described in step (1) is one of indium oxide, indium nitrate, indium sulfate and inidum chloride or two
Kind or more.
Preferably, grind in step (2) when it is 30 ~ 90 minutes a length of；Dry temperature is 80 ~ 100 DEG C, dry duration
It is 6 ~ 8 hours.
Preferably, calcium auxiliary agent described in step (3) is one or more of calcium carbonate, calcium nitrate and calcium oxide.
Preferably, tin auxiliary agent described in step (3) is one or more of stannic chloride, nitric acid tin and tin oxide.
Preferably, kneading described in step (4) when it is 120 ~ 240 minutes a length of, the vacuum pressure of the vacuum pugging is-
0.09 ~ -0.095 MPa, the number of vacuum pugging are 2 ~ 4 times.
Preferably, temperature dry described in step (5) is 60 ~ 80 DEG C, 48 ~ 60 hours a length of when dry.
The SCR denitration of anti-arsenic poisoning is prepared using the above method.
The SCR denitration of anti-arsenic poisoning obtained above includes following component (being calculated in mass percent): five oxidations
Two vanadium (V2O5) 0.1 ~ 1.5%, molybdenum trioxide (MoO3) 5 ~ 10%, bismuth oxide (Bi2O3) or indium oxide (In2O3) 2 ~ 6.5%, oxidation
Calcium (CaO) 5.0 ~ 8.0%, tin oxide (SnO) 5.0 ~ 8.0%, SiO21.5 ~ 3.0%, aluminum oxide (Al2O3) 0.5 ~ 1%, surplus
For titanium dioxide (TiO2).
Raw materials used in above-mentioned preparation process is ordinary commercial products.
The beneficial effects of the present invention are: on the basis of using vanadic anhydride, molybdenum trioxide as active component, using bismuth
Auxiliary agent or indium auxiliary agent form stable vanadate, molybdate with active material vanadic anhydride, molybdenum trioxide, thus to five oxygen
Change the protection of two vanadium, prevents catalyst to arsenic poisoning；The structural promoter of resistance to arsenic poisoning is added simultaneously, prevents arsenic in catalyst surface
Deposition and aggregation, and calcium arsenate or arsenic acid tin can be formed with arsenic, inhibit catalyst to be poisoned arsenical fume depth, further increases
The anti-arsenic poisoning ability of catalyst and resistance to deactivation energy.Using preparation method of the present invention, SCR denitration can be extended and obtain the longevity
Life reduces denitrating system use cost, improves adaptability of SCR denitration under the conditions of arsenical fume；The present invention is made
The anti-arsenic poisoning ability of SCR denitration be higher by 2 ~ 4 times than existing catalyst, denitration efficiency is stably held in 88% or more, real
Breakthrough of SCR denitration technology under the conditions of arsenical fume is showed.
Specific embodiment
In order to keep technical purpose of the invention, technical scheme and beneficial effects clearer, combined with specific embodiments below
Technical solution of the present invention is further illustrated, but the embodiment is intended to explain the present invention, and should not be understood as pair
Limitation of the invention, in the examples where no specific technique or condition is specified, according to the literature in the art described technology or
Condition is carried out according to product description.
Tung oil described in following embodiments is purchased from Zhengzhou autumn rain Chemical Co., Ltd.；The silica solution is real purchased from the double human relations in Shanghai
Industry Co., Ltd, model CL-P, solid content 41%, pH 4, colloidal particle size are 22 nm, 140 m of specific surface area2/g；Methyl
Cellulose (C29H54O16, CAS:9004-67-5) be purchased from Shanghai Mike woods biochemical technology Co., Ltd, methoxyl content 26%~
33%, degree of substitution (DS) 1.3~2.0, viscosity (20 DEG C, 2% aqueous solution) 15~4000 mPas；Glass fibre is purchased from Zhengzhou City
Jinshui District Hao Sheng building materials firm；Titanium dioxide (titanium dioxide) be purchased from Hangzhou Wanjing New Material Co., Ltd., model VK-TA10,
Anatase titanium dioxide.
Embodiment 1
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and bismuth nitrate are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of bismuth element is 0.83:6.66:3.59；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2,30 min is ground, then in 80
DEG C dry 8 h obtain active powder material in 400 DEG C of 6 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (2)
15 parts of gained active powder material, 10 parts of structural promoter, 0.1 part of tung oil, 2 parts of silica solution, 0.1 part of methylcellulose, glass fibre 2
Part, 73 parts of titanium dioxide and 45 parts of deionized water；Wherein, the structural promoter is by calcium oxide and tin oxide according to mass ratio 1:1
It mixes and obtains；
(4) mixing pug is mediated into 120 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.09 MPa, room
After 12 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 60 DEG C of dry 48 h, then in 400 DEG C of 36 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O51.5%, MoO310%,
Bi2O34%, CaO 5.0%, SnO 5.0%, SiO21.5%, Al2O30.5%, surplus TiO2。
Embodiment 2
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and bismuth nitrate are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of bismuth element is 0.056:3.33:4.48；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:4, grind 90 min, then in
100 DEG C of 6 h of drying obtain active powder material in 600 DEG C of 4 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
10 parts of gained active powder material, 18 parts of structural promoter, 0.5 part of tung oil, 3 parts of silica solution, 0.05 part of methylcellulose, glass fibre 6
66 parts and 55 parts part, titanium dioxide deionized waters；Wherein, the structural promoter is by calcium nitrate and nitric acid tin according to mass ratio 1:5
It mixes and obtains；
(4) mixing pug is mediated into 240 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.095 MPa, room
After 24 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 70 DEG C of dry 60 h, then in 600 DEG C of 24 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O50.1%, MoO35%,
Bi2O3 5%, CaO 3%, SnO 15%, SiO23%, Al2O31%, surplus TiO2。
Embodiment 3
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and inidum chloride are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of phosphide element is 0.056:3.33:1.65；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:3,30 min is ground, then in 80
DEG C dry 8 h obtain active powder material in 400 DEG C of 6 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
7 parts of gained active powder material, 18 parts of structural promoter, 0.1 part of tung oil, 1 part of silica solution, 0.05 part of methylcellulose, glass fibre 2
Part, 73 parts of titanium dioxide and 50 parts of deionized water；Wherein, the structural promoter is by calcium chloride and stannic chloride according to mass ratio 1:2
It mixes and obtains；
(4) mixing pug is mediated into 120 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.090MPa, room
After 12 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 60 DEG C of dry 60 h, then in 400 DEG C of 36 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O50.1%, MoO35%, In2O3
2%, CaO 6%, SnO 12%, SiO21.5%, Al2O30.5%, surplus TiO2。
Embodiment 4
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and indium oxide are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of phosphide element is 0.83:6.66:4.55；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:4, grind 90 min, then in
100 DEG C of 6 h of drying obtain active powder material in 600 DEG C of 4 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
17 parts of gained active powder material, 16 parts of structural promoter, 0.5 part of tung oil, 3 parts of silica solution, 0.1 part of methylcellulose, glass fibre 6
Part, 61 parts of titanium dioxide and 48 parts of deionized water；Wherein, the structural promoter is by calcium oxide and tin oxide according to mass ratio 1:3
It mixes and obtains；
(4) mixing pug is mediated into 240 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.095MPa, room
After 24 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 80 DEG C of dry 48 h, then in 600 DEG C of 24 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O51.5%, MoO310%,
In2O35.5%, CaO 4%, SnO 12%, SiO23%, Al2O31%, surplus TiO2。
Embodiment 5
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and indium nitrate are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of phosphide element is 0.45:4.66:2.89；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2,90 min is ground, then in 90
DEG C dry 8 h obtain active powder material in 600 DEG C of 4 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
12 parts of gained active powder material, 15 parts of structural promoter, 0.03 part of tung oil, 2.5 parts of silica solution, 0.07 part of methylcellulose, glass fibers
5 parts of dimension, 68 parts of titanium dioxide and 51 parts of deionized water；Wherein, the structural promoter is by calcium nitrate and nitric acid tin according to mass ratio
1:4 is mixed and is obtained；
(4) mixing pug is mediated into 200 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.092MPa, room
After 18 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 75 DEG C of dry 45 h, then in 550 DEG C of 30 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O50.8%, MoO37%, In2O3
3.5%, CaO 3%, SnO 12%, SiO22.8%, Al2O30.7%, surplus TiO2。
Embodiment 6
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and bismuth sulfate are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of bismuth element is 0.67:5.33:5.83；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:4, grind 90 min, then in
100 DEG C of 8 h of drying obtain active powder material in 600 DEG C of 6 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
15 parts of gained active powder material, 18 parts of structural promoter, 0.4 part of tung oil, 2 parts of silica solution, 0.07 part of methylcellulose, glass fibre 4
Part, 63 parts of titanium dioxide and 49 parts of deionized water；Wherein, the structural promoter is by calcium oxide and tin oxide according to mass ratio 1:1
It mixes and obtains；
(4) mixing pug is mediated into 140 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.095MPa, room
After 12 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 70 DEG C of dry 60 h, then in 600 DEG C of 36 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O51.2%, MoO38%, Bi2O3
6.5%, CaO 9%, SnO 9%, SiO22.7 parts, Al2O30.7%, surplus TiO2。
Comparative example 1
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate and ammonium molybdate are mixed according to the quality in embodiment 1, obtains activated feedstock；That is: activated feedstock
The mass ratio of middle vanadium and molybdenum element is 0.83:6.66；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2,30 min is ground, then in 80
DEG C dry 8 h obtain active powder material in 400 DEG C of 6 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
15 parts of gained active powder material, 0.1 part of tung oil, 2 parts of silica solution, 0.1 part of methylcellulose, 2 parts of glass fibre, 83 parts of titanium dioxide
With 45 parts of deionized waters；
(4) mixing pug is mediated into 120 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.090MPa, room
After 12 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 60 DEG C of dry 48 h, then in 400 DEG C of 36 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O51.5%, MoO310%,
SiO21.5%, Al2O30.5%, surplus TiO2。
Comparative example 1 is not the difference from embodiment 1 is that add bismuth auxiliary agent.
Comparative example 2
A kind of preparation method of the SCR denitration of anti-arsenic poisoning, comprising the following steps:
(1) ammonium metavanadate, ammonium molybdate and bismuth nitrate are mixed, obtains activated feedstock；Vanadium, molybdenum element in activated feedstock
And the mass ratio of bismuth element is 0.83:6.66:3.59；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2,30 min is ground, then in 80
DEG C dry 8 h obtain active powder material in 400 DEG C of 6 h of calcining；
(3) preparation mixing pug, the mixing pug are mixed by following raw material according to mass percent: step (1)
15 parts of gained active powder material, 0.1 part of tung oil, 2 parts of silica solution, 0.1 part of methylcellulose, 2 parts of glass fibre, 83 parts of titanium dioxide
With 45 parts of deionized waters；
(4) mixing pug is mediated into 120 min, vacuum pugging 3 times under conditions of vacuum pressure is -0.090MPa, room
After 12 h of temperature ageing, vacuum extruding obtains honeycomb blank；
(5) by honeycomb blank obtained by step (4) in 60 DEG C of dry 48 h, then in 400 DEG C of 36 h of calcining to get.
The ingredient (being calculated in mass percent) of SCR denitration obtained above are as follows: V2O51.5%, MoO310%,
Bi2O34%, SiO21.5%, Al2O30.5%, surplus TiO2。
Comparative example 2 is not the difference from embodiment 1 is that add structural promoter.
It is 1 ug/g that SCR denitration obtained by embodiment 1 ~ 8, comparative example 1 and comparative example 2, which is immersed in arsenic content,
Solution in, impregnate 30 min, then in 105 DEG C of dry 2 h, according still further to GBT 31587-2015, " cellular denitrating flue gas is urged
Agent " in desired denitration efficiency and Activity determination standard, after detection denitration efficiency, activity and reaction in SCR denitration
The content of arsenic；Test condition are as follows: NO 500 ppm, NH3500 ppm, O210%, SO21000 ppm, N2It is empty for Balance Air
5000 h of speed-1, 380 DEG C of temperature of detection, 20 × 20 hole of catalyst, length 500mm.Testing result is as shown in table 1.
Denitration efficiency, activity and the arsenic content of 1 SCR denitration of table
As it can be seen from table 1 SCR denitration made from embodiment 1 ~ 6 is substantially better than comparative example 1 and comparative example 2 is made
SCR denitration, SCR denitration denitration efficiency made from embodiment 1 ~ 6 and activity improve more significant, and lead to
Content of the detection arsenic in SCR denitration is crossed, the anti-arsenic ability of SCR denitration made from embodiment 1 ~ 6 improves more
Significantly, 2 ~ 4 times are improved than comparative example 1 and the resistance to arsenic ability of comparative example 2；It can be seen that changing through active matter formula adjustment and structural promoter
Into rear, SCR denitration denitration efficiency, activity and anti-arsenic poisoning ability are all significantly improved.
SCR denitration produced by the present invention not only increases denitration efficiency and activity, moreover it is possible to anti-arsenic poisoning.Therefore,
SCR denitration of the present invention meets the requirement of power plant's arsenical fume, can effectively extend denitrating catalyst
Service life guarantees higher denitration efficiency, reduces the production cost of coal fired thermal power plant, has great economic value.
It should be noted last that: technical solution of the present invention that the above embodiments are only illustrative and not limiting is any right
The equivalent replacement and do not depart from the modification of spirit and scope of the invention or locally replace that the present invention carries out, should all cover in this hair
Within bright protective scope of the claims.
Claims (4)
1. a kind of SCR denitration of anti-arsenic poisoning, which is characterized in that be calculated in mass percent, the SCR denitration
Including following component: V2O50.1 ~ 1.5%, MoO35 ~ 10%, Bi2O3Or In2O32 ~ 6.5%, CaO 5.0 ~ 8.0%, SnO 5.0 ~
8.0%, SiO2 1.5 ~ 3.0%, Al2O30.5 ~ 1%, surplus TiO2；
The SCR denitration is made as follows:
(1) ammonium metavanadate, ammonium molybdate and anti-arsenic auxiliary agent are mixed, obtains activated feedstock；Wherein, the anti-arsenic auxiliary agent is bismuth auxiliary agent
Or indium auxiliary agent；When anti-arsenic auxiliary agent is bismuth auxiliary agent, in activated feedstock the mass ratio of vanadium, molybdenum element and bismuth element be 0.05 ~
0.85:3.33 ~ 6.67:1.79 ~ 5.83；When anti-arsenic auxiliary agent is indium auxiliary agent, vanadium, molybdenum element and phosphide element in activated feedstock
Mass ratio be 0.05 ~ 0.85:3.33 ~ 6.67:1.65 ~ 5.38；
(2) activated feedstock obtained by step (1) and citric acid are mixed according to mass ratio 1:2 ~ 4, grinding, drying, in 400 ~ 600 DEG C
Calcining 4 ~ 6 hours, obtains active powder material；
(3) preparation mixing pug, the mixing pug are mixed according to parts by weight by following raw material: living obtained by step (2)
7 ~ 17 parts of powder of property, 10 ~ 18 parts of structural promoter, 0.1 ~ 0.5 part of tung oil, 1 ~ 3 part of silica solution, 0.05 ~ 0.1 part of methylcellulose,
2 ~ 6 parts of glass fibre, 59 ~ 81 parts of titanium dioxide, 45 ~ 55 parts of water；Wherein, the structural promoter by calcium auxiliary agent and tin auxiliary agent according to
Mass ratio 1:1 ~ 5 is mixed and is obtained；
(4) pug kneading, vacuum pugging will be mixed, after room temperature ageing, vacuum extruding obtains honeycomb blank；
(5) will honeycomb blank obtained by step (4) it is dry after, calcined in 400 ~ 600 DEG C 24 ~ 36 hours to get；
Bismuth auxiliary agent described in step (1) is one or more of bismuth oxide, bismuth nitrate, bismuth sulfate and bismuth chloride；
Indium auxiliary agent described in step (1) is one or more of indium oxide, indium nitrate, indium sulfate and inidum chloride；
Calcium auxiliary agent described in step (3) is one or more of calcium carbonate, calcium nitrate and calcium oxide；
Tin auxiliary agent described in step (3) is one or more of stannic chloride, nitric acid tin and tin oxide.
2. the SCR denitration of anti-arsenic poisoning according to claim 1, it is characterised in that: the duration ground in step (2)
It is 30 ~ 90 minutes；Dry temperature is 80 ~ 100 DEG C, 6 ~ 8 hours a length of when dry.
3. the SCR denitration of anti-arsenic poisoning according to claim 1, it is characterised in that: kneading described in step (4)
Shi Changwei 120 ~ 240 minutes；The vacuum pressure of the vacuum pugging is -0.09 ~ -0.095 MPa, the number of vacuum pugging is 2 ~
4 times.
4. the SCR denitration of anti-arsenic poisoning according to claim 1, it is characterised in that: drying described in step (5)
Temperature is 60 ~ 80 DEG C, 48 ~ 60 hours a length of when dry.
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| CN108273512A (en) * | 2018-01-18 | 2018-07-13 | 华北电力大学 | The flat anti-arsenic poisoning denitrating catalyst of one kind and its preparation process |
| CN108435159B (en) * | 2018-04-24 | 2021-06-04 | 北京航空航天大学 | Denitration catalyst for improving arsenic poisoning resistance and preparation method and application thereof |
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