CN105413678A - Honeycomb denitration catalyst with water resistance and preparation method therefor - Google Patents
Honeycomb denitration catalyst with water resistance and preparation method therefor Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 40
- 238000000498 ball milling Methods 0.000 claims abstract description 27
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000004381 surface treatment Methods 0.000 claims abstract description 4
- 238000004078 waterproofing Methods 0.000 claims description 29
- 239000002002 slurry Substances 0.000 claims description 25
- 238000001354 calcination Methods 0.000 claims description 21
- 239000011268 mixed slurry Substances 0.000 claims description 20
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 17
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 11
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 9
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 6
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 206010013786 Dry skin Diseases 0.000 claims description 5
- 230000000274 adsorptive effect Effects 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 16
- 239000003546 flue gas Substances 0.000 abstract description 16
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 abstract 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- NWJUARNXABNMDW-UHFFFAOYSA-N tungsten vanadium Chemical compound [W]=[V] NWJUARNXABNMDW-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 208000030303 breathing problems Diseases 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
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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
- B01J23/30—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
The invention relates to a honeycomb denitration catalyst with water resistance and a preparation method therefor and belongs to the flue gas denitration field. The catalyst employs titanium dioxide as a carrier and employs vanadium pentoxide as an active component, auxiliary agents of tungsten trioxide, an organic binding agent and a forming auxiliary agent are added, extrusion molding is carried out, and surface treatment is carried out by utilization of a waterproof agent. The catalyst is simple in preparation steps, the conversion rate of the active component vanadium pentoxide is high, the mechanical strength is high, and the service life is long. Solids are dispersed uniformly through the ball milling technology, the micropore structure of the catalyst is changed, and the bonding force of the waterproof agent sodium methyl silicate and the catalyst is raised. When the catalyst operates in flue gas with a low temperature (260-300 DEG C) and a high water content (the water content is more than 10%), the denitration efficiency still can reach more than 95%, the environment application range of the catalyst is widened, and the service life is 3.5-4.5 years.
Description
Technical field
The present invention relates to a kind of honeycomb type denitrification catalyst and preparation method thereof, particularly relate to a kind of honeycomb type denitrification catalyst with water proofing property and preparation method thereof.
Background technology
Nitrogen oxide (the NO discharged in flue gas
x), not only can cause a series of environmental pollution, as broken ring ozone layer, acid rain, greenhouse effects, photochemical fog etc., and plant growth can be endangered, cause the breathing problem of the mankind.NO
xthe source of discharge is mainly from electric power, heating power production and supply industry.In recent years due to NO
xdischarge the social concern caused day by day remarkable, State Bureau of Environmental Protection is to NO
xreduce discharging and propose stricter requirement, along with country is to NO
xdischarge standard more and more higher, according to " national environmental protection " 12 " planning " requirement, " 12 " period China's nitrogen oxide emission to reduce 10%, by 2015, the discharge capacity of nitrogen oxide reduced to 2046.2 ten thousand tons, therefore current China NO
xputting forward effect reduces discharging extremely urgent.SCR denitration technology, because denitration efficiency is high, good selective, therefore, has nowadays become the mainstream technology of denitrating flue gas.
The denitration technology mainly SCR of power plant, SCR denitration technology refers under high-temperature, NO
xand NH
3under catalyst action, nontoxic nitrogen and water can be generated.But existing SCR reactor is arranged between economizer and air preheater, belong to high dirt and high-sulfur layout, in flue gas, moisture content is high; When the moisture content of flue gas is greater than 10%, in use owing to destroying catalytic mechanical intensity and suppressing catalyst activity to make denitration efficiency be reduced to 80 ~ 85% by 90 ~ 95%, and affect the service life of catalyst, make be reduced to 2 ~ 2.5 years by 3 ~ 3.5 years the service life of catalyst.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, provide a kind of honeycomb type denitrification catalyst with water proofing property and preparation method thereof, concrete technical scheme is as follows:
A kind of honeycomb type denitrification catalyst with water proofing property and preparation method thereof, described catalyst take titanium dioxide as carrier, take vanadic anhydride as active component, surface treatment is carried out with waterproofing agent after adding auxiliary agent tungstic acid, organic binder bond and shaping assistant extrusion molding, described vanadic anhydride is 1.8 ~ 2.5% compared to the percentage by weight of titanium dioxide, and described catalyst is prepared by following steps:
Step 1: by weight, get 80 ~ 90 parts of titanium dioxide, 5 ~ 10 parts of tungstic acids, put into ball mill, then in ball mill, to add after 42.5 ~ 50 parts of water and 17 ~ 20 parts of ammoniacal liquor ball milling 1 ~ 2 hour, the drum speed of ball mill is 20r/min, namely obtains titanium dioxide slurries;
Step 2: when the moisture in titanium dioxide slurries is greater than 30%, continue ball milling again 1 ~ 2 hour until when moisture in titanium dioxide slurries is less than or equal to 30%, in titanium dioxide slurries, add the glass fibre of 120 ~ 150 weight portion 2wt% ammonium metavanadate aqueous solutions, 12 ~ 16 weight portions, ball milling 1 ~ 2 hour mixed slurry;
Step 3: when the moisture in mixed slurry is greater than 27%, continue ball milling again 1 ~ 2 hour until when moisture in mixed slurry is less than or equal to 27%, the water of 65 ~ 75 weight portions, the ammoniacal liquor of 26 ~ 30 weight portions is added in mixed slurry, in ball mill, add the polyethylene glycol oxide of 5.3 ~ 5.8 weight portions and the carboxymethyl cellulose of 6.5 ~ 6.9 weight portions again, ball milling 1.5 ~ 2 hours pug;
Step 4: by pug by calcining in Muffle furnace after small-sized extruder for shaping, namely obtain semi-finished product;
Step 5: the honeycomb type denitrification catalyst described in namely obtaining for 12 hours 250 DEG C of dryings after the semi-finished product after calcining put into waterproofing agent adsorptive 1 ~ 2h with water proofing property.
As the improvement of technique scheme, in described step 1, the mass ratio of titanium dioxide and tungstic acid is (9 ~ 16): 1.
As the improvement of technique scheme, the gross weight of titanium dioxide and tungstic acid in ball mill in described step 1: the weight of water: the weight=10:5:2 of ammoniacal liquor.
As the improvement of technique scheme, the mass fraction of the ammoniacal liquor in described step 1 is 25% ~ 28%, and the mass fraction of the ammoniacal liquor in step 3 is 25% ~ 28%.
As the improvement of technique scheme, the mass fraction in described step 2 be 2% the temperature of ammonium metavanadate aqueous solution when adding titanium dioxide slurries be 75 ~ 85 DEG C.
As the improvement of technique scheme, the calcining heat in described step 4 is 550 DEG C, and calcination time is 165 minutes.
As the improvement of technique scheme, the waterproofing agent in described step 5 be by sodium methyl silicate and water according to sodium methyl silicate: the dilution proportion of water=1:14 is made, and the solid contents of sodium methyl silicate is 30%.
Advantageous Effects of the present invention: described catalyst is carrier with titanium dioxide, take vanadic anhydride as active component, carries out surface treatment with waterproofing agent after adding auxiliary agent tungstic acid, organic binder bond and shaping assistant extrusion molding.Adopt glass fibre that ammonium metavanadate is uniformly dispersed in manufacturing process, improve conversion ratio and the activity of vanadic anhydride; Organic binder bond carboxymethyl cellulose, auxiliary agent polyethylene glycol oxide improves the plasticity of pug; In pug, add tungstic acid and by calcining after extrusion molding, improving the mechanical strength of catalyst, extending its service life.This catalyst surface attached to the water-repellent layer that one deck has sodium methyl silicate, sodium methyl silicate is a kind of high temperature resistant waterproof agent, baking temperature is 200 DEG C ~ 450 DEG C, ensure shaping after catalyst at 200 DEG C ~ 450 DEG C, still can keep excellent waterproof efficacy, there is excellent water-resistance, improve the service life of catalyst, and sodium methyl silicate low price.This catalyst making step is simple, adopts ball grinding technique to be to make the microcellular structure that solid dispersal is even, change catalyst, being convenient to sodium methyl silicate and being adsorbed on the surface of catalyst, increase the adhesion between sodium methyl silicate and catalyst; When ball milling, the change in concentration of ammoniacal liquor directly affects the uniformity of microcellular structure.When this catalyst runs under the flue gas of lower temperature (260 ~ 300 DEG C), high-moisture percentage (moisture content is greater than 10%), the denitration efficiency of catalyst still can reach more than 95%, and the environment scope of application of catalyst is widened, and reaches 3.5 ~ 4.5 years service life.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
embodiment 1
(1) take 80Kg titanium dioxide, 5Kg tungstic acid, put into ball mill, then in ball mill, add 42.5Kg water and 17Kg mass fraction be ball milling 1 hour after 25% ~ 28% ammoniacal liquor, the drum speed of ball mill is 20r/min, namely obtains titanium dioxide slurries;
(2) when the moisture in titanium dioxide slurries is greater than 30%, continue ball milling again 1 ~ 2 hour until when moisture in titanium dioxide slurries is less than or equal to 30%, in titanium dioxide slurries, add 120Kg mass fraction is the ammonium metavanadate aqueous solution of 2%, the glass fibre of 12Kg, ball milling 1 hour mixed slurry, wherein mass fraction is the temperature of ammonium metavanadate aqueous solution when adding titanium dioxide slurries of 2% is 75 DEG C;
(3) when the moisture in mixed slurry is greater than 27%, continue ball milling again 1 ~ 2 hour until when moisture in mixed slurry is less than or equal to 27%, in mixed slurry, add the water of 65Kg, 26Kg mass fraction is the ammoniacal liquor of 25% ~ 28%, in ball mill, add polyethylene glycol oxide and the 6.5Kg carboxymethyl cellulose of 5.3Kg again, ball milling 1.5 hours pug;
(4) by pug by calcining in Muffle furnace after small-sized extruder for shaping, namely obtain semi-finished product, wherein calcining heat is 550 DEG C, and calcination time is 165 minutes;
(5) by sodium methyl silicate and water according to sodium methyl silicate: the dilution proportion of water=1:14 makes waterproofing agent, and wherein the solid contents of sodium methyl silicate is 30%; There is described within 12 hours, namely obtaining 250 DEG C of dryings after semi-finished product after calcining put into waterproofing agent adsorptive 1h the honeycomb type denitrification catalyst of water proofing property.
The mensuration of denitration efficiency:
At the temperature of 350 DEG C, will pass into containing the nitric oxide production simulated flue gas of 600ppm in the above-mentioned vanadium tungsten denitrating catalyst prepared, wherein the moisture content of flue gas is 15%, and the speed that flue gas passes into is 8000h
-1, collect tail gas, the denitration efficiency recording this denitrating catalyst is 96.8%.
embodiment 2
(1) 84Kg titanium dioxide, 7Kg tungstic acid is taken, put into ball mill, in ball mill, add 45.5Kg water and 18.2Kg mass fraction is again ball milling 1.5 hours after 25% ~ 28% ammoniacal liquor, and the drum speed of ball mill is 20r/min, namely obtains titanium dioxide slurries;
(2) when the moisture in titanium dioxide slurries is greater than 30%, continue ball milling again 1 ~ 2 hour until when moisture in titanium dioxide slurries is less than or equal to 30%, in titanium dioxide slurries, add 135Kg mass fraction is the ammonium metavanadate aqueous solution of 2%, the glass fibre of 15Kg, ball milling 1.5 hours mixed slurry, wherein mass fraction is the temperature of ammonium metavanadate aqueous solution when adding titanium dioxide slurries of 2% is 81 DEG C;
(3) when the moisture in mixed slurry is greater than 27%, continue ball milling again 1 ~ 2 hour until when moisture in mixed slurry is less than or equal to 27%, in mixed slurry, add the water of 70Kg, 28Kg mass fraction is the ammoniacal liquor of 25% ~ 28%, in ball mill, add polyethylene glycol oxide and the 6.8Kg carboxymethyl cellulose of 5.6Kg again, ball milling 100 minutes pug;
(4) by pug by calcining in Muffle furnace after small-sized extruder for shaping, namely obtain semi-finished product, wherein calcining heat is 550 DEG C, and calcination time is 165 minutes;
(5) by sodium methyl silicate and water according to sodium methyl silicate: the dilution proportion of water=1:14 makes waterproofing agent, and wherein the solid contents of sodium methyl silicate is 30%; Semi-finished product after calcining put into waterproofing agent adsorptive within 12 hours, namely obtain 250 DEG C of dryings after 1.5 hours described in there is the honeycomb type denitrification catalyst of water proofing property.
The mensuration of denitration efficiency:
At the temperature of 290 DEG C, will pass into containing the nitric oxide production simulated flue gas of 600ppm in the above-mentioned vanadium tungsten denitrating catalyst prepared, wherein the moisture content of flue gas is 15%, and the speed that flue gas passes into is 8000h
-1, collect tail gas, the denitration efficiency recording this denitrating catalyst is 97.7%.
embodiment 3
(1) take 90Kg titanium dioxide, 10Kg tungstic acid, put into ball mill, then in ball mill, add 50Kg water and 20Kg mass fraction be ball milling 2 hours after 25% ~ 28% ammoniacal liquor, the drum speed of ball mill is 20r/min, namely obtains titanium dioxide slurries;
(2) when the moisture in titanium dioxide slurries is greater than 30%, continue ball milling again 1 ~ 2 hour until when moisture in titanium dioxide slurries is less than or equal to 30%, in titanium dioxide slurries, add 150Kg mass fraction is the ammonium metavanadate aqueous solution of 2%, the glass fibre of 16Kg, ball milling 2 hours mixed slurry, wherein mass fraction is the temperature of ammonium metavanadate aqueous solution when adding titanium dioxide slurries of 2% is 85 DEG C;
(3) when the moisture in mixed slurry is greater than 27%, continue ball milling again 1 ~ 2 hour until when moisture in mixed slurry is less than or equal to 27%, in mixed slurry, add the water of 75Kg, 30Kg mass fraction is the ammoniacal liquor of 25% ~ 28%, in ball mill, add polyethylene glycol oxide and the 6.9Kg carboxymethyl cellulose of 5.8Kg again, ball milling 2 hours pug;
(4) by pug by calcining in Muffle furnace after small-sized extruder for shaping, namely obtain semi-finished product, wherein calcining heat is 550 DEG C, and calcination time is 165 minutes;
(5) by sodium methyl silicate and water according to sodium methyl silicate: the dilution proportion of water=1:14 makes waterproofing agent, and wherein the solid contents of sodium methyl silicate is 30%; There is described within 12 hours, namely obtaining 250 DEG C of dryings after semi-finished product after calcining put into waterproofing agent adsorptive 2h the honeycomb type denitrification catalyst of water proofing property.
The mensuration of denitration efficiency:
At the temperature of 260 DEG C, will pass into containing the nitric oxide production simulated flue gas of 600ppm in the above-mentioned vanadium tungsten denitrating catalyst prepared, wherein the moisture content of flue gas is 15%, and the speed that flue gas passes into is 8000h
-1, collect tail gas, the denitration efficiency recording this denitrating catalyst is 95.9%.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. honeycomb type denitrification catalyst with water proofing property and preparation method thereof, it is characterized in that, described catalyst take titanium dioxide as carrier, take vanadic anhydride as active component, surface treatment is carried out with waterproofing agent after adding auxiliary agent tungstic acid, organic binder bond and shaping assistant extrusion molding, described vanadic anhydride is 1.8 ~ 2.5% compared to the percentage by weight of titanium dioxide, and described catalyst is prepared by following steps:
Step 1: by weight, get 80 ~ 90 parts of titanium dioxide, 5 ~ 10 parts of tungstic acids, put into ball mill, then in ball mill, to add after 42.5 ~ 50 parts of water and 17 ~ 20 parts of ammoniacal liquor ball milling 1 ~ 2 hour, the drum speed of ball mill is 20r/min, namely obtains titanium dioxide slurries;
Step 2: when the moisture in titanium dioxide slurries is greater than 30%, continue ball milling again 1 ~ 2 hour until when moisture in titanium dioxide slurries is less than or equal to 30%, in titanium dioxide slurries, add 120 ~ 150 weight portion mass fractions is the ammonium metavanadate aqueous solution of 2%, the glass fibre of 12 ~ 16 weight portions, ball milling 1 ~ 2 hour mixed slurry;
Step 3: when the moisture in mixed slurry is greater than 27%, continue ball milling again 1 ~ 2 hour until when moisture in mixed slurry is less than or equal to 27%, the water of 65 ~ 75 weight portions, the ammoniacal liquor of 26 ~ 30 weight portions is added in mixed slurry, in ball mill, add the polyethylene glycol oxide of 5.3 ~ 5.8 weight portions and the carboxymethyl cellulose of 6.5 ~ 6.9 weight portions again, ball milling 1.5 ~ 2 hours pug;
Step 4: by pug by calcining in Muffle furnace after small-sized extruder for shaping, namely obtain semi-finished product;
Step 5: the honeycomb type denitrification catalyst described in namely obtaining for 12 hours 250 DEG C of dryings after the semi-finished product after calcining put into waterproofing agent adsorptive 1 ~ 2h with water proofing property.
2. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, is characterized in that: in described step 1, the mass ratio of titanium dioxide and tungstic acid is (9 ~ 16): 1.
3. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, is characterized in that: the gross weight of titanium dioxide and tungstic acid in ball mill in described step 1: the weight of water: the weight=10:5:2 of ammoniacal liquor.
4. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, is characterized in that: the mass fraction of the ammoniacal liquor in described step 1 is 25% ~ 28%, and the mass fraction of the ammoniacal liquor in step 3 is 25% ~ 28%.
5. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, is characterized in that: the mass fraction in described step 2 be 2% the temperature of ammonium metavanadate aqueous solution when adding titanium dioxide slurries be 75 ~ 85 DEG C.
6. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, is characterized in that: the calcining heat in described step 4 is 550 DEG C, and calcination time is 165 minutes.
7. a kind of honeycomb type denitrification catalyst with water proofing property according to claim 1 and preparation method thereof, it is characterized in that: the waterproofing agent in described step 5 be by sodium methyl silicate and water according to sodium methyl silicate: the dilution proportion of water=1:14 is made, and the solid contents of sodium methyl silicate is 30%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106311301A (en) * | 2016-08-19 | 2017-01-11 | 安徽元琛环保科技股份有限公司 | Super-wear-resistant cellular denitration catalyst and preparation method thereof |
| CN106391065A (en) * | 2016-08-19 | 2017-02-15 | 安徽元琛环保科技股份有限公司 | A wide-temperature type honeycomb denitration catalyst and a preparing method thereof |
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| CN112717921A (en) * | 2020-09-01 | 2021-04-30 | 江苏峰业科技环保集团股份有限公司 | SCR denitration catalyst and preparation process thereof |
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