CN106902807A - A kind of particle type low-temperature SCR catalyst and preparation method thereof - Google Patents
A kind of particle type low-temperature SCR catalyst and preparation method thereof Download PDFInfo
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- CN106902807A CN106902807A CN201710274254.6A CN201710274254A CN106902807A CN 106902807 A CN106902807 A CN 106902807A CN 201710274254 A CN201710274254 A CN 201710274254A CN 106902807 A CN106902807 A CN 106902807A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Abstract
The invention discloses a kind of particle type low-temperature SCR catalyst, including：Anatase titanium dioxide, ammonium metavanadate, dispersant, pore creating material, binding agent, shaping assistant, structural promoter, lubricant, coagent and water, each component mass ratio is：1：0.01~0.15：0.02~0.25：0.005~0.02：0.005~0.02：0.005~0.02：0.02~0.10：0.005~0.02：0.005~0.015：0.2~0.6；Wherein dispersant is oxalic acid or monoethanolamine；Pore creating material is kapok or activated carbon；Binding agent is hydroxypropyl methyl cellulose or carboxymethylcellulose calcium；Shaping assistant is polyethylene glycol oxide；Structural promoter is glass fibre or NACF；Lubricant is stearic acid or lactic acid；Coagent is ammonium paramolybdate or ammonium paratungstate.The preparation method of above-mentioned catalyst is also disclosed.Particle type low-temperature SCR catalyst of the invention obtained can be used in denitration under low-temperature condition, and the features such as with low temperature, low-sulfur, low dirt, and denitration efficiency is high, long service life.The preparation method is simple, and flow is short, high yield rate, energy-conserving and environment-protective.
Description
Technical field
The present invention relates to low-temperature denitration catalyst field, more particularly to a kind of particle type low-temperature SCR catalyst and its system
Preparation Method.
Background technology
As Chinese haze phenomenon is increasingly severe, country has put into effect a series of environmental protection policy, improves to fume emission
Standard.In the recent period, Sino-German scientist cracks North China " haze mystery ", it is determined that nitrogen oxides is one of the arch-criminal to form haze, is carried
Go out " controlling haze will first control nitrogen oxides ", it can be seen that the improvement of nitrogen oxides has been extremely urgent.
Gas denitrifying technology most ripe at present is SCR (selective oxidation reduction) technology, and it is denitration side after a kind of stove
Method.Comercial operation is completed in the later stage in age 20th century 60-70 by Japan earliest, is urged in metal using reducing agent (NH3, urea)
Under agent effect, optionally with NOx reaction generation N2 and H2O, aoxidized rather than by O2, therefore be referred to as " selectivity ".In the world
Popular SCR techniques are broadly divided into ammonia process SCR and 2 kinds of urea method SCR.This 2 kinds of methods are all the reduction work(to NOx using ammonia
Can, NOx (mainly NO) is reduced to be not much air the N2 and water of influence in the presence of catalyst, reducing agent is
NH3。
The catalyst used in SCR technology is most with TiO2 as carrier, is with V2O5 or V2O5-WO3 or V2O5-MoO3
Active component, is made honeycomb fashion, board-like or corrugated three types.The denitrating catalyst of present is mostly high temperature catalysis
Agent, belongs to high-temperature high dust arrangement, advantage:The method denitration efficiency is high, and relative low price is widely used in domestic and international project
In, the mainstream technology as generating plant flue gas denitration.Shortcoming:Contain sulphur content in fuel, can be generated in combustion process a certain amount of
SO3.After addition catalyst, under aerobic conditions, the growing amount of SO3 is significantly increased, and generates NH4HSO4 with excessive NH3.
NH4HSO4 has corrosivity and viscosity, can cause back-end ductwork device damage.In addition, catalyst poisoning phenomenon also can not be ignored.
If after SCR system is arranged in into desulfurating dust-removing equipment, not only increasing catalyst life and reducing energy consumption, its operating temperature is big
Generally below 200 DEG C, but existing catalyst is not suitable for using at such a temperature.
As can be seen here, above-mentioned existing SCR catalyst is using upper, it is clear that has still suffered from inconvenience and defect, and has urgently added
Further to improve.A kind of new particle type low-temperature SCR catalyst and preparation method thereof how is founded, desulfurization is arranged in
After cleaner, blocking, abrasion and the As of catalyst can be solved the problems such as be poisoned, reduce maintenance cost, improve service life, subtracted
The reheating of few low-temperature flue gas has denitration efficiency higher in the case where temperature is 150~300 DEG C of flue gas conditions so as to reducing energy consumption,
Improved target is needed as current industry pole.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of particle type low-temperature SCR catalyst, is arranged in desulfurization and removed
After dirt equipment, blocking, abrasion and the As of catalyst can be solved the problems such as be poisoned, reduce maintenance cost, improve service life,
The reheating of low-temperature flue gas is reduced so as to reducing energy consumption, in the case where temperature is 150~300 DEG C of flue gas conditions there is denitration higher to imitate
Rate, so as to overcome the shortcomings of existing catalyst.
In order to solve the above technical problems, the present invention provides a kind of particle type low-temperature SCR catalyst, the catalyst is included such as
Lower component：Anatase titanium dioxide, ammonium metavanadate, dispersant, pore creating material, binding agent, shaping assistant, structural promoter, lubricant,
Coagent and water, the mass ratio of its each component is：1：0.01~0.15：0.02~0.25：0.005~0.02：0.005~
0.02：0.005~0.02：0.02~0.10：0.005~0.02：0.005~0.015：0.2~0.6；
Wherein, the dispersant uses oxalic acid or monoethanolamine；The pore creating material uses kapok or activated carbon；The binding agent
Using hydroxypropyl methyl cellulose or carboxymethylcellulose calcium；The shaping assistant uses polyethylene glycol oxide；The structural promoter is adopted
With glass fibre or NACF；The lubricant uses stearic acid or lactic acid；The coagent using ammonium paramolybdate or
Ammonium paratungstate.
Used as a modification of the present invention, the preparation method of the catalyst is：
(1) batch weighing：The each component of the catalyst is carried out into precise in mass ratio, respectively storage, it is stand-by；
(2) with liquid：Step (1) is weighed ammonium metavanadate, coagent, dispersant and the water for obtaining to match somebody with somebody in a heated condition
Ammonium metavanadate solution is made, it is stand-by；
(3) mix：Step (1) is weighed anatase titanium dioxide, pore creating material, binding agent, shaping assistant, the structure for obtaining
Auxiliary agent, lubricant composition are added in high speed mixer, are first pre-mixed 0.5~2h, are subsequently adding the ammonium metavanadate solution,
The mixed at high speed of 1~5h is carried out again, forms block moulded pottery not yet put in a kiln to bake；
(4) mediate：The block moulded pottery not yet put in a kiln to bake that step (3) is obtained is added in kneader and is strongly mediated, control is mediated temperature and existed
50~100 DEG C, kneading time is 2~6h, forms plastic mud material；
(5) it is old：By step, (4 plastic mud materials for obtaining are positioned over old 24~48h in 10~30 DEG C of environment；
(6) extrusion molding：Plastic mud material of the step (5) after old is extruded by extruder and is in strip pug；
(7) dry：24~48h is spontaneously dried at the bar shaped pug that step (6) is obtained first is placed in into 10~30 DEG C；It is placed in again
4~10h is dried in 60~120 DEG C of drying room；
(8) it is calcined：The dried bar shaped pug of step (7) is transferred in roaster immediately, sintering temperature is slowly risen to
550~650 DEG C, 5~15h is calcined, is calcined after terminating the natural cooling in stove, obtain final product the particle type low-temperature SCR catalyst.
Further improve, in (2) step (1) is weighed the step of the method for preparing catalyst obtain ammonium metavanadate,
Coagent, dispersant and part water are configured to the ammonium metavanadate solution that concentration is 5%~25%, remaining water in a heated condition
Added in the premixing of the step (3).
Also include preliminary extrusion step, the pre-extruded step in the step of further improvement, method for preparing catalyst (6)
Suddenly it is：Plastic mud material of the step (5) after old is added to pre-extruded machine, prefiltering net is first passed through and is removed large granular materials,
Then the pug after filtering is extruded into section for foursquare plastic mud material base by double helix pre-extruded machine, then will be described
Plastic mud material base is placed in the extruder.
Further improve, the sectional area of bar shaped pug obtained in the step (6) be cloverleaf pattern, its a diameter of 1.6~
3.2mm。
The present invention also provides a kind of preparation method of such as above-mentioned particle type low-temperature SCR catalyst, and the preparation method includes
Following steps：
(1) batch weighing：The each component of the catalyst is carried out into precise in mass ratio, respectively storage, it is stand-by；
(2) with liquid：Step (1) is weighed ammonium metavanadate, coagent, dispersant and the water for obtaining to match somebody with somebody in a heated condition
Ammonium metavanadate solution is made, it is stand-by；
(3) mix：Step (1) is weighed anatase titanium dioxide, pore creating material, binding agent, shaping assistant, the structure for obtaining
Auxiliary agent, lubricant composition are added in high speed mixer, are first pre-mixed 0.5~2h, are subsequently adding the ammonium metavanadate solution,
The mixed at high speed of 1~5h is carried out again, forms block moulded pottery not yet put in a kiln to bake；
(4) mediate：The block moulded pottery not yet put in a kiln to bake that step (3) is obtained is added in kneader and is strongly mediated, control is mediated temperature and existed
50~100 DEG C, kneading time is 2~6h, forms plastic mud material；
(5) it is old：By step, (4 plastic mud materials for obtaining are positioned over old 24~48h in 10~30 DEG C of environment；
(6) extrusion molding：Plastic mud material of the step (5) after old is extruded by extruder and is in strip pug；
(7) dry：24~48h is spontaneously dried at the bar shaped pug that step (6) is obtained first is placed in into 10~30 DEG C；It is placed in again
4~10h is dried in 60~120 DEG C of drying room；
(8) it is calcined：The dried bar shaped pug of step (7) is transferred in roaster immediately, sintering temperature is slowly risen to
550~650 DEG C, 5~15h is calcined, is calcined after terminating the natural cooling in stove, obtain final product the particle type low-temperature SCR catalyst.
Further improve, in the step (2) by step (1) weigh obtain ammonium metavanadate, coagent, dispersant and
Part water is configured to the ammonium metavanadate solution that concentration is 5%~25% in a heated condition, and remaining water is pre- the step (3)
Added in mixing.
Further improve, preliminary extrusion step is also included in the step (6), the preliminary extrusion step is：Step (5) is old
Plastic mud material after corruption is added to pre-extruded machine, first passes through prefiltering net and removes large granular materials, then by the mud after filtering
Material is extruded into section for foursquare plastic mud material base by double helix pre-extruded machine, then the plastic mud material base is placed in into institute
In stating extruder.
Further improve, the sectional area of bar shaped pug obtained in the step (6) be cloverleaf pattern, its a diameter of 1.6~
3.2mm.The structure is to open well-regulated cloverleaf pattern hole on mould due to the extruder, and die feeding side is provided with one
Raised spreader.
Further improve, temperature is controlled using electrical heating method in the drying room and roaster.
In addition, the roaster in the calcination stepses is provided with wind circulating system, for controlling the oxidation atmosphere in roaster.
Through aiutage high altitude discharge after sack cleaner dust removal by filtration, release meets fume emission mark to the waste gas produced in the roaster
Accurate flue gas.
After such design, the present invention at least has advantages below：
Particle type low-temperature SCR catalyst of the present invention with anatase titanium dioxide as carrier, with ammonium metavanadate as activearm
Point, also by adding dispersant, pore creating material, shaping assistant, structural promoter, lubricant, coagent and water, match somebody with somebody by certain mass
When regulation preparation method is prepared from, after obtained particle type low-temperature SCR catalyst is used for desulfurating dust-removing equipment, can be in low temperature
Denitration is used under state, and the features such as with low temperature, low-sulfur, low dirt, and obtained specific surface area of catalyst is big, and denitration efficiency is high,
Long service life, also solves the problems such as blocking of catalyst, abrasion, poisoning.
Particle type low-temperature SCR catalyst of the present invention is interval in " low temperature " catalytic temperature, it is to avoid to the secondary of low-temperature flue gas
Heating, reduces energy consumption, meets the Scientific Outlook on Development of energy-conserving and environment-protective.
Particle type low-temperature SCR catalyst of the present invention is different from substantial amounts of honeycomb catalyst in the market and board-like catalysis
Agent, novel section can more meet the catalytic efficiency of denitration under cryogenic conditions, actual flue gas for the bar shaped catalyst of clover formula
In 175 DEG C of temperature, air speed 20000h-1Under the conditions of denitration efficiency be higher than 70%.
The preparation method of particle type low-temperature SCR catalyst of the present invention is simple, and flow is short, high yield rate, when drying and being calcined
Between more traditional honeycomb catalyst preparation time it is short, greatly reducing energy consumption, production capacity is greatly improved, it is easy to industrial metaplasia
Produce and active component decentralization is high, obtained specific surface area of catalyst is big, and denitration efficiency is high, long service life.
Specific embodiment
Embodiment 1
Particle type low-temperature SCR catalyst 1 is prepared, specific preparation method is：
(1) batch weighing：By anatase titanium dioxide, ammonium metavanadate, oxalic acid, activated carbon, carboxymethylcellulose calcium, polyoxygenated
Ethene, NACF, lactic acid, ammonium paramolybdate, water, according to mass ratio 1：0.01：0.02：0.005：0.005：0.005：
0.02：0.005：0.005：0.2 carries out precise, respectively storage, it is standby；
(2) with liquid：Ammonium metavanadate, lactic acid, oxalic acid and part water are configured to the inclined vanadium that concentration is 5% in a heated condition
Acid ammonium solution；
(3) mix：Remaining powder in step (1) and remaining water are added in high speed mixer, powder premix is first carried out
Close, incorporation time is 0.5h, then the ammonium metavanadate solution in step (2) is added in high-speed mixer, and carry out 1h's
Mixed at high speed, ultimately forms block moulded pottery not yet put in a kiln to bake；
(4) mediate：The moulded pottery not yet put in a kiln to bake obtained in step (3) is added to carries out strength kneading in kneader, and by moulded pottery not yet put in a kiln to bake
Temperature control is mediated at 50 DEG C, kneading time is 2h, ultimately forms plastic mud material；
(5) it is old：The plastic mud material obtained in step (4) is positioned over old 36h in 10 DEG C of environment；
(6) pre-extruded：The plastic mud material obtained in step (5) is added to pre-extruded machine, first passing through prefiltering net will be big
Granule materials are removed, and the pug after filtering is foursquare plastic mud material base by double helix pre-extruded machine Formation cross-section；
(7) extruded moulding：The plastic mud material base obtained in step (6) is added to extruder, is ground by extruder one end
The a diameter of 3.2mm bar shapeds pug of tool extrusion；
(8) dry：The bar shaped pug obtained in step (7) is positioned at a temperature of 10 DEG C and spontaneously dries 24h；Then will be from
Right dried bar shaped pug is placed in drying room, is 60 DEG C, drying time 4h by electric heating control drying temperature；
(9) high-temperature roasting：The strip-shaped materials obtained in step (8) are transferred to roaster immediately from after drying room taking-up
In, sintering temperature is slowly risen to 550 DEG C by electrical heating, then roasting time 5h is calcined naturally cold in roaster after terminating
But, you can obtain particle type low-temperature SCR catalyst 1.
Test case 1：
The active testing of the particle type low-temperature SCR catalyst 1：
The particle type catalyst 40g that embodiment 1 is produced carries out active testing in being filled in fixed bed reactors, and in sky
Fast 20000h-1, ammonia nitrogen than being reacted under 1.0, oxygen concentration 2.5%, the flue gas condition of water content 15%, under test different temperatures
Denitration efficiency, as a result such as table 1 below.
The particle type low-temperature SCR catalyst 1 of table 1 denitration efficiency result at different temperatures
Embodiment 2
Particle type low-temperature SCR catalyst 2 is prepared, specific preparation method is：
(1) batch weighing：By anatase titanium dioxide, ammonium metavanadate, monoethanolamine, kapok, carboxymethylcellulose calcium, polyoxygenated
Ethene, NACF, stearic acid, ammonium paramolybdate, water, according to mass ratio 1：0.10：0.15：0.01：0.01：0.01：0.08：
0.012：0.010：0.5 carries out precise；
(2) with liquid：By ammonium metavanadate, lactic acid, oxalic acid and part water be configured in a heated condition concentration be 20% it is inclined
Ammonium Vanadate Solution；
(3) mix：Remaining powder in step (1) and remaining water are added in high speed mixer, powder premix is first carried out
Close, incorporation time is 1.0h, then the ammonium metavanadate solution in step (2) is added in high-speed mixer, and carry out 2.5h
Mixed at high speed, ultimately form block moulded pottery not yet put in a kiln to bake；
(4) mediate：The moulded pottery not yet put in a kiln to bake obtained in step (3) is added to carries out strength kneading in kneader, and by moulded pottery not yet put in a kiln to bake
Temperature control is mediated at 75 DEG C, kneading time is 4h, ultimately forms plastic mud material；
(5) it is old：The plastic mud material obtained in step (4) is positioned over old 24h in 20 DEG C of environment；
(6) pre-extruded：The plastic mud material obtained in step (5) is added to pre-extruded machine, first passing through prefiltering net will be big
Granule materials are removed, and the pug after filtering is foursquare plastic mud material base by double helix pre-extruded machine Formation cross-section；
(7) extruded moulding：The plastic mud material base obtained in step (6) is added to extruder, is ground by extruder one end
The a diameter of 2.4mm bar shapeds pug of tool extrusion；
(8) dry：The bar shaped pug obtained in step (7) is positioned at a temperature of 20 DEG C and spontaneously dries 36h；Then will be from
Right dried bar shaped pug is placed in drying room, is 90 DEG C, drying time 6h by electric heating control drying temperature；
(9) high-temperature roasting：The strip-shaped materials obtained in step (8) are transferred to roaster immediately from after drying room taking-up
In, sintering temperature is slowly risen to 600 DEG C by electrical heating, then roasting time 10h is calcined naturally cold in roaster after terminating
But, you can obtain particle type low-temperature SCR catalyst 2.
Test case 2：
The active testing of the particle type low-temperature SCR catalyst 2：
The particle type catalyst 40g that embodiment 2 is produced carries out active testing in being filled in fixed bed reactors, and in sky
Fast 20000h-1, ammonia nitrogen than being reacted under 1.0, oxygen concentration 2.5%, the flue gas condition of water content 15%, under test different temperatures
Denitration efficiency, as a result such as table 2 below.
The particle type low-temperature SCR catalyst 2 of table 2 denitration efficiency result at different temperatures
Embodiment 3
Particle type low-temperature SCR catalyst 3 is prepared, specific preparation method is：
(1) batch weighing：By anatase thpe white powder, ammonium metavanadate, oxalic acid, kapok, hydroxypropyl methyl cellulose, polyoxygenated
Ethene, glass fibre, stearic acid, ammonium paratungstate, water, according to mass ratio 1：0.15：0.25：0.02：0.02：0.02：0.10：
0.02：0.015：0.6 carries out precise；
(2) with liquid：By ammonium metavanadate, lactic acid, oxalic acid and part water be configured in a heated condition concentration be 25% it is inclined
Ammonium Vanadate Solution；
(3) mix：Remaining powder in step (1) and remaining water are added in high speed mixer, powder premix is first carried out
Close, incorporation time is 2.0h, then the ammonium metavanadate solution in step (2) is added in high-speed mixer, and carry out 5.0h
Mixed at high speed, ultimately form block moulded pottery not yet put in a kiln to bake；
(4) mediate：The moulded pottery not yet put in a kiln to bake obtained in step (3) is added to carries out strength kneading in kneader, and by moulded pottery not yet put in a kiln to bake
Temperature control is mediated at 100 DEG C, kneading time is 6h, ultimately forms plastic mud material；
(5) it is old：The plastic mud material obtained in step (4) is positioned over old 48h in 30 DEG C of environment；
(6) pre-extruded：The plastic mud material obtained in step (5) is added to pre-extruded machine, first passing through prefiltering net will be big
Granule materials are removed, and the pug after filtering is foursquare plastic mud material base by double helix pre-extruded machine Formation cross-section；
(7) extruded moulding：The plastic mud material base obtained in step (6) is added to extruder, is ground by extruder one end
The a diameter of 1.6mm bar shapeds pug of tool extrusion；
(8) dry：The bar shaped pug obtained in step (7) is positioned at a temperature of 30 DEG C and spontaneously dries 48h；Then will be from
Right dried bar shaped pug is placed in drying room, is 120 DEG C, drying time 10h by electric heating control drying temperature；
(9) high-temperature roasting：The strip-shaped materials obtained in step (8) are transferred to roaster immediately from after drying room taking-up
In, sintering temperature is slowly risen to 650 DEG C by electrical heating, then roasting time 15h is calcined naturally cold in roaster after terminating
But, you can obtain particle type low-temperature SCR catalyst 3.
Test case 3：
The active testing of the particle type low-temperature SCR catalyst 3：
The particle type catalyst 40g that embodiment 3 is produced carries out active testing in being filled in fixed bed reactors, and in sky
Fast 20000h-1, ammonia nitrogen than being reacted under 1.0, oxygen concentration 2.5%, the flue gas condition of water content 15%, under test different temperatures
Denitration efficiency, as a result such as table 3 below.
The particle type low-temperature SCR catalyst 3 of table 3 denitration efficiency result at different temperatures
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, this
Art personnel make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within this hair
In bright protection domain.
Claims (10)
1. a kind of particle type low-temperature SCR catalyst, it is characterised in that the catalyst includes following component：Detitanium-ore-type titanium white
Powder, ammonium metavanadate, dispersant, pore creating material, binding agent, shaping assistant, structural promoter, lubricant, coagent and water, its each group
Point mass ratio be：1：0.01~0.15：0.02~0.25：0.005~0.02：0.005~0.02：0.005~0.02：0.02
~0.10：0.005~0.02：0.005~0.015：0.2~0.6；
Wherein, the dispersant uses oxalic acid or monoethanolamine；The pore creating material uses kapok or activated carbon；The binding agent is used
Hydroxypropyl methyl cellulose or carboxymethylcellulose calcium；The shaping assistant uses polyethylene glycol oxide；The structural promoter uses glass
Glass fiber or NACF；The lubricant uses stearic acid or lactic acid；The coagent uses ammonium paramolybdate or secondary tungsten
Sour ammonium.
2. particle type low-temperature SCR catalyst according to claim 1, it is characterised in that the preparation method of the catalyst
For：
(1) batch weighing：The each component of the catalyst is carried out into precise in mass ratio, respectively storage, it is stand-by；
(2) with liquid：Step (1) is weighed ammonium metavanadate, coagent, dispersant and the water for obtaining to be configured in a heated condition
Ammonium metavanadate solution, it is stand-by；
(3) mix：Step (1) is weighed the anatase titanium dioxide that obtains, pore creating material, binding agent, shaping assistant, structure to help
Agent, lubricant composition are added in high speed mixer, are first pre-mixed 0.5~2h, are subsequently adding the ammonium metavanadate solution, then
The mixed at high speed of 1~5h is carried out, block moulded pottery not yet put in a kiln to bake is formed；
(4) mediate：The block moulded pottery not yet put in a kiln to bake that step (3) is obtained is added in kneader and is strongly mediated, control mediate temperature 50~
100 DEG C, kneading time is 2~6h, forms plastic mud material；
(5) it is old：By step, (4 plastic mud materials for obtaining are positioned over old 24~48h in 10~30 DEG C of environment；
(6) extrusion molding：Plastic mud material of the step (5) after old is extruded by extruder and is in strip pug；
(7) dry：24~48h is spontaneously dried at the bar shaped pug that step (6) is obtained first is placed in into 10~30 DEG C；It is placed in 60 again~
4~10h is dried in 120 DEG C of drying room；
(8) it is calcined：The dried bar shaped pug of step (7) is transferred in roaster immediately, sintering temperature slowly rises to 550~
650 DEG C, 5~15h is calcined, is calcined after terminating the natural cooling in stove, obtain final product the particle type low-temperature SCR catalyst.
3. particle type low-temperature SCR catalyst according to claim 2, it is characterised in that the method for preparing catalyst
Ammonium metavanadate, coagent, dispersant and part water that step (1) weighing is obtained are prepared in a heated condition in step (2)
Into the ammonium metavanadate solution that concentration is 5%~25%, remaining water is added in the premixing of the step (3).
4. particle type low-temperature SCR catalyst according to claim 2, it is characterised in that the method for preparing catalyst
Also include preliminary extrusion step in step (6), the preliminary extrusion step is：Plastic mud material of the step (5) after old is added to pre-
Extruder, first passes through prefiltering net and removes large granular materials, and then the pug after filtering is squeezed by double helix pre-extruded machine
Go out Formation cross-section for foursquare plastic mud material base, then the plastic mud material base is placed in the extruder.
5. the particle type low-temperature SCR catalyst according to any one of claim 2 to 4, it is characterised in that the step (6)
The sectional area of obtained bar shaped pug is cloverleaf pattern, its a diameter of 1.6~3.2mm.
6. a kind of preparation method of particle type low-temperature SCR catalyst as claimed in claim 1, it is characterised in that：The preparation
Method comprises the following steps：
(1) batch weighing：The each component of the catalyst is carried out into precise in mass ratio, respectively storage, it is stand-by；
(2) with liquid：Step (1) is weighed ammonium metavanadate, coagent, dispersant and the water for obtaining to be configured in a heated condition
Ammonium metavanadate solution, it is stand-by；
(3) mix：Step (1) is weighed the anatase titanium dioxide that obtains, pore creating material, binding agent, shaping assistant, structure to help
Agent, lubricant composition are added in high speed mixer, are first pre-mixed 0.5~2h, are subsequently adding the ammonium metavanadate solution, then
The mixed at high speed of 1~5h is carried out, block moulded pottery not yet put in a kiln to bake is formed；
(4) mediate：The block moulded pottery not yet put in a kiln to bake that step (3) is obtained is added in kneader and is strongly mediated, control mediate temperature 50~
100 DEG C, kneading time is 2~6h, forms plastic mud material；
(5) it is old：By step, (4 plastic mud materials for obtaining are positioned over old 24~48h in 10~30 DEG C of environment；
(6) extrusion molding：Plastic mud material of the step (5) after old is extruded by extruder and is in strip pug；
(7) dry：24~48h is spontaneously dried at the bar shaped pug that step (6) is obtained first is placed in into 10~30 DEG C；It is placed in 60 again~
4~10h is dried in 120 DEG C of drying room；
(8) it is calcined：The dried bar shaped pug of step (7) is transferred in roaster immediately, sintering temperature slowly rises to 550~
650 DEG C, 5~15h is calcined, is calcined after terminating the natural cooling in stove, obtain final product the particle type low-temperature SCR catalyst.
7. the preparation method of particle type low-temperature SCR catalyst according to claim 6, it is characterised in that the step (2)
It is middle step (1) weighed into the ammonium metavanadate, coagent, dispersant and the part water that obtain be configured to concentration in a heated condition be
5%~25% ammonium metavanadate solution, remaining water is added in the premixing of the step (3).
8. the preparation method of particle type low-temperature SCR catalyst according to claim 6, it is characterised in that the step (6)
In also include preliminary extrusion step, the preliminary extrusion step is：Plastic mud material of the step (5) after old is added to pre-extruded machine,
First pass through prefiltering net to remove large granular materials, be then extruded into the pug after filtering by double helix pre-extruded machine cutting
Face is foursquare plastic mud material base, then the plastic mud material base is placed in the extruder.
9. the preparation method of the particle type low-temperature SCR catalyst according to claim 7 or 8, it is characterised in that the step
(6) sectional area of bar shaped pug obtained in is cloverleaf pattern, its a diameter of 1.6~3.2mm.
10. the preparation method of particle type low-temperature SCR catalyst according to claim 5, it is characterised in that the drying room
Temperature is controlled using electrical heating method with roaster.
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