CN108722432A - Low-temperature SCR catalyst and preparation method thereof in a kind of high activity - Google Patents
Low-temperature SCR catalyst and preparation method thereof in a kind of high activity Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 58
- 230000000694 effects Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 229910003158 γ-Al2O3 Inorganic materials 0.000 claims abstract description 15
- 238000001354 calcination Methods 0.000 claims abstract description 13
- 238000001802 infusion Methods 0.000 claims abstract description 9
- 230000002045 lasting effect Effects 0.000 claims abstract description 9
- 238000007598 dipping method Methods 0.000 claims abstract description 8
- 229910001960 metal nitrate Inorganic materials 0.000 claims abstract description 8
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910003320 CeOx Inorganic materials 0.000 claims abstract description 3
- 229910015189 FeOx Inorganic materials 0.000 claims abstract description 3
- 229910016978 MnOx Inorganic materials 0.000 claims abstract description 3
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 claims description 21
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 7
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 101150116295 CAT2 gene Proteins 0.000 description 3
- 101100392078 Caenorhabditis elegans cat-4 gene Proteins 0.000 description 3
- 101100326920 Caenorhabditis elegans ctl-1 gene Proteins 0.000 description 3
- 101100494773 Caenorhabditis elegans ctl-2 gene Proteins 0.000 description 3
- 101100112369 Fasciola hepatica Cat-1 gene Proteins 0.000 description 3
- 101100005271 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cat-1 gene Proteins 0.000 description 3
- 101100005280 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) cat-3 gene Proteins 0.000 description 3
- 101100126846 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) katG gene Proteins 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910002492 Ce(NO3)3·6H2O Inorganic materials 0.000 description 2
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WKXHZKXPFJNBIY-UHFFFAOYSA-N titanium tungsten vanadium Chemical compound [Ti][W][V] WKXHZKXPFJNBIY-UHFFFAOYSA-N 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
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
-
- 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
- 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
-
- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of preparation methods of new efficient middle low temperature SCR denitration catalyst, and the catalyst is with γ-Al2O3For carrier, using FeOx or CeOx and MnOx as catalyst, the load capacity of the catalyst is in 5%-15%.It uses following steps to prepare：(1) by γ-Al2O3Powder infusion persistently stirs 2 hours in metal-nitrate solutions under room temperature, completes dipping；(2) lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated；(3) product will be evaporated to continue drying out under conditions of 105-115 DEG C 11-13 hours, complete drying；(4) desciccate is continued to calcining 4-6 hours under the conditions of 490-510 DEG C.The catalyst activity is high, it can be achieved that 95% or more denitration efficiency at a temperature of 150-250 DEG C.The preparation method of this catalyst changes crystal form and the distribution of metal oxide by adjusting the proportioning of ferromanganese cerium, improves catalyst surface chemisorption oxygen content, enhances internal crystal framework oxygen mobility, to which the activity of catalyst greatly improved.
Description
Technical field
The invention belongs to catalyst technical field, specific design one kind removing nitrogen oxidation for industrial tail gas by ammonia catalytic reduction process
The preparation method of object catalyst.
Background technology
Nitrogen oxides is the important composition of multiple industry pollutant emissions such as electric power, steel, non-ferrous metal, building materials, petrochemical industry
Maximum part, wherein accounting example are NO, usually 95% or more.NO all has serious danger to health and natural environment
Evil.In September, 2017, Chinese Ministry of Environmental Protection issues《Coal-burning power plant's minimum discharge smoke gas treatment engineering legislation》(exposure draft),
It is distinctly claimed and reaches minimum discharge standard in the core control zone of drug in some provinces, i.e., under 6% benchmark oxygen content, realize flue dust
≤5mg/Nm3、SO2≤35mg/Nm3, nitrogen oxides≤50mg/Nm3.Requirement standard of the country for discharged nitrous oxides is more next
It is severeer.
Tail gas nitrogen oxide removing sulfuldioxide can be divided into wet method and dry method two major classes：Wet denitration includes mainly oxidative absorption method, goes back
Former absorption process, alkali absorption method etc.；Dry method is primarily referred to as all kinds of catalytic eliminating methods, plasma removal method etc..Wherein SCR technology
It is current most ripe denitration technology, which uses ammonia as reducing agent, under the action of catalyst, nitrogen oxides is reduced into
Water and nitrogen.Current most widely used vanadium tungsten titanium System Catalyst technology maturation, but there are the higher (300- of running temperature
400 DEG C) the problem of.
Novel high-activity denitrating catalyst mainly improves the catalytic performance of (150-250 DEG C) under cryogenic conditions in catalyst.By
The condition limitation of partial tail gas discharge, the middle cryogenic property of catalyst is better, and the operating cost of SCR reactors is lower.Therefore, it opens
It is extremely urgent to send out low-temperature denitration catalyst in high activity.
Invention content
The purpose of the present invention is developing a kind of preparation method of new efficient middle low temperature SCR denitration catalyst, make it in middle low temperature
There is good catalytic activity under (150-250 DEG C), can realize effective removing of nitrogen oxides in industrial tail gas.
To achieve the above object, the present invention uses following technical scheme：
Low-temperature SCR catalyst in a kind of high activity, the catalyst is with γ-Al2O3For carrier, with FeOx or CeOx and
MnOx is catalyst, and the load capacity of the catalyst is in 5%-15%.
The preparation method of low-temperature SCR catalyst, specifically includes following steps in a kind of high activity：
(1) it impregnates：By γ-Al2O3Powder infusion persistently stirs 2 hours in metal-nitrate solutions under room temperature, completes leaching
Stain；
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated；
(3) dry：Product will be evaporated to continue drying out under conditions of 105-115 DEG C 11-13 hours, complete drying；
(4) it calcines：Desciccate is continued to calcining 4-6 hours under the conditions of 490-510 DEG C；
Metal nitrate in the step (1) is the mixture or manganese nitrate and nitric acid of manganese nitrate or ferric nitrate and manganese nitrate
The mixture or ferric nitrate of cerium, the mixture of manganese nitrate and cerous nitrate.
γ-Al in the step (1)2O3The mesh number of powder is 150-250.
Metal nitrate in the step (1) is one or more of ferric nitrate, manganese nitrate, cerous nitrate.
Solvent in the step (1) in metal-nitrate solutions is distilled water or deionized water.
In order to which the later stage is preferably molded, desciccate should be in free-flowing in the step (3).
Evaporated temperature in the step (3) is 110 DEG C, and drying time is 12 hours, and the calcination temperature in the step (4) is
500 DEG C, calcination time is 5 hours.
Beneficial effects of the present invention：The present invention develops low temperature SCR denitration catalyst in a kind of novel high-activity, is urged using this
Agent carries out SCR denitration reaction, is 6000-14000h in air speed-1, 150-250 DEG C of temperature, nitrogen oxide in tail gas concentration
100-400mg/m3Under the conditions of can be achieved 95% or more denitration efficiency.The preparation method of this catalyst is by adjusting ferromanganese cerium
Proportioning change crystal form and the distribution of metal oxide, improve catalyst surface chemisorption oxygen content, enhance inside
Lattice oxygen mobility, to which the activity of catalyst greatly improved.Catalyst is with γ-Al simultaneously2O3For carrier, with ferric nitrate, nitre
Sour manganese and cerous nitrate are catalyst, low in raw material price, and production cost is low.
Description of the drawings
Fig. 1 is the SEM figures of low temperature SCR denitration catalyst in high activity prepared by embodiment 1.
Fig. 2 is the SEM figures of low temperature SCR denitration catalyst in high activity prepared by embodiment 2.
Fig. 3 is the SEM figures of low temperature SCR denitration catalyst in high activity prepared by embodiment 3.
Fig. 4 is the SEM figures of low temperature SCR denitration catalyst in high activity prepared by embodiment 4.
Specific implementation mode
Below by specific embodiment, the present invention will be further described.
Embodiment 1
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take the 200 mesh γ-Al of 100g2O3The manganese nitrate solution of powder, 28mL mass fractions 50% is dissolved in 300mL
In water.By γ-Al2O3Powder infusion persistently stirs 2 hours in manganese nitrate aqueous solution under room temperature, completes dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 110 DEG C 12 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 5 hours under the conditions of 500 DEG C, it is Cat-1, manganese oxide that catalyst number, which is made,
Load capacity is 9.5%.
Embodiment 2
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take 100 grams of 200 mesh γ-Al2O3Powder, the manganese nitrate solution of 28mL mass fractions 50%, 4.04 grams of Fe
(NO3)3·9H2O is dissolved in 300mL water.By γ-Al2O3It is small that powder infusion persistently stirs 2 in manganese nitrate aqueous solution, under room temperature
When, complete dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 110 DEG C 12 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 5 hours under the conditions of 500 DEG C, it is Cat-2, manganese oxide that catalyst number, which is made,
It is 10.7% with iron oxide load capacity.
Embodiment 3
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take 100 grams of 200 mesh γ-Al2O3Powder, the manganese nitrate solution of 28mL mass fractions 50%, 8.68 grams of Ce
(NO3)3·6H2O is dissolved in 300mL water.By γ-Al2O3It is small that powder infusion persistently stirs 2 in manganese nitrate aqueous solution, under room temperature
When, complete dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 110 DEG C 12 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 5 hours under the conditions of 500 DEG C, it is Cat-3, manganese oxide that catalyst number, which is made,
It is 12.2% with cerium oxide load capacity.
Embodiment 4
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take 100 grams of 200 mesh γ-Al2O3Powder, the manganese nitrate solution of 28mL mass fractions 50%, 2.83 grams of Fe
(NO3)3·9H2O, 6.51 grams of Ce (NO3)3·6H2O is dissolved in 300mL water.By γ-Al2O3Powder infusion is in manganese nitrate aqueous solution
In, it is persistently stirred under room temperature 2 hours, completes dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 110 DEG C 12 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 5 hours under the conditions of 500 DEG C, it is Cat-4 that catalyst number, which is made, oxidation
Manganese, iron oxide and cerium oxide load capacity are 12.4%.
Embodiment 5
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take the 150 mesh γ-Al of 100g2O3The manganese nitrate solution of powder, 18mL mass fractions 50% is dissolved in 300mL
In water.By γ-Al2O3Powder infusion persistently stirs 2 hours in manganese nitrate aqueous solution under room temperature, completes dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 105 DEG C 11 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 4 hours under the conditions of 490 DEG C, catalyst is made, manganese oxide load amount is
5%.
Embodiment 6
In the present embodiment in high activity low temperature SCR denitration catalyst preparation method, steps are as follows：
(1) it impregnates：Take the 250 mesh γ-Al of 100g2O3The manganese nitrate solution of powder, 28mL mass fractions 50% is dissolved in 300mL
In water.By γ-Al2O3Powder infusion persistently stirs 2 hours in manganese nitrate aqueous solution under room temperature, completes dipping.
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated.
(3) dry：Product will be evaporated to continue drying out under conditions of 115 DEG C 13 hours, complete drying.
(4) it calcines：Desciccate is continued to calcining 6 hours under the conditions of 510 DEG C, obtains catalyst, manganese oxide load amount is
9.8%.
It is 6000-14000h in air speed-1, under the conditions of 150-250 DEG C of temperature, SCR reactions are carried out, wherein NO is a concentration of in tail gas
400mg/m3.The catalyst prepared in embodiment 1-4 is respectively adopted.The results are shown in Table 1 for evaluation experimental.
1 SCR denitration experimental evaluation result of table
| Catalyst | Reaction temperature DEG C | Air speed h-1 | NO concentration mg/m after reaction3 |
| Cat-1 | 175 | 6000 | 50 |
| Cat-2 | 175 | 8000 | 30 |
| Cat-3 | 150 | 12000 | 25 |
| Cat-4 | 150 | 14000 | 20 |
From the results shown in Table 1, be added to catalyst Cat-2, Cat-3 after two kinds of elements of Fe and Ce are modified and
Cat-4, catalytic performance are significantly improved than the Cat-1 before modification, under conditions of same Mn load capacity, in temperature
Degree is lower, in the case of air speed is higher, realizes higher removal of nitrogen oxide rate.
The basic principles and main features and advantages of the present invention of the present invention, the technology people of the industry has been shown and described above
Member is not it should be appreciated that the present invention receives the limitation of above-described embodiment, and the above embodiments and description only describe this hairs
Bright principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variations
It all fall within the protetion scope of the claimed invention with improvement.
Claims (6)
1. low-temperature SCR catalyst in a kind of high activity, which is characterized in that the catalyst is with γ-Al2O3For carrier, with FeOx or
CeOx and MnOx is catalyst, and the load capacity of the catalyst is in 5%-15%.
2. the preparation method of low-temperature SCR catalyst in a kind of high activity described in claim 1, which is characterized in that steps are as follows：
(1) it impregnates：By γ-Al2O3Powder infusion persistently stirs 2 hours in metal-nitrate solutions under room temperature, completes dipping；
(2) it is evaporated：It is lasting to stir by step (1) products obtained therefrom under 100 DEG C of water bath conditions, until being evaporated；
(3) dry：Product will be evaporated to continue drying out under conditions of 105-115 DEG C 11-13 hours, complete drying；
(4) it calcines：Desciccate is continued to calcining 4-6 hours under the conditions of 490-510 DEG C；
Metal nitrate in the step (1) is the mixture or manganese nitrate and nitric acid of manganese nitrate or ferric nitrate and manganese nitrate
The mixture or ferric nitrate of cerium, the mixture of manganese nitrate and cerous nitrate.
3. the preparation method of low-temperature SCR catalyst in high activity according to claim 2, which is characterized in that the step
(1) γ-Al in2O3The mesh number of powder is 150-250.
4. the preparation method of low-temperature SCR catalyst in high activity according to claim 3, which is characterized in that the step
(1) solvent in metal-nitrate solutions is distilled water or deionized water.
5. the preparation method of low-temperature SCR catalyst in high activity according to claim 4, which is characterized in that the step
(3) desciccate should be in free-flowing in.
6. the preparation method of low-temperature SCR catalyst in high activity according to claim 5, which is characterized in that the step
(3) evaporated temperature in is 110 DEG C, and drying time is 12 hours, and the calcination temperature in the step (4) is 500 DEG C, when calcining
Between be 5 hours.
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| CN113786852B (en) * | 2021-09-29 | 2023-11-24 | 上海电力大学 | Low-temperature SCR denitration catalyst taking SiC as carrier, and preparation method and application thereof |
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