CN106475105B - A kind of double-perovskite type O composite metallic oxide catalyst and the preparation method and application thereof - Google Patents
A kind of double-perovskite type O composite metallic oxide catalyst and the preparation method and application thereof Download PDFInfo
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- 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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- 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
- B01D53/8659—Removing halogens or halogen compounds
- B01D53/8662—Organic halogen compounds
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- 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
- B01J23/83—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 rare earths or actinides
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/206—Organic halogen compounds
- B01D2257/2064—Chlorine
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Abstract
The invention discloses a kind of double-perovskite type O composite metallic oxide catalysts and the preparation method and application thereof, belong to technical field of atmospheric pollution control.The skeleton symbol of the double-perovskite type O composite metallic oxide catalyst is A2B2O6, A are La, Sr or Ce, and B are Mn, Fe, Co, Cu or Ni.The catalyst has excellent heat-resisting quantity, water-resistance and resistance against chlorine, can be applied to effective degradation of CVOCs under industrial high temperature environment.The catalyst reaction temperature be 500-550 DEG C, reaction velocity 20000-30000h‑1, oxygen concentration be 10-20% under the conditions of can be achieved Typical Industrial CVOCs (1,2- dichloroethanes) complete oxidation.The load capacity for passing through modulation transition metal oxide simultaneously, can effectively improve the oxidation efficiency of catalyst, increase substantially reaction product CO2Selectivity.Process for synthetic catalyst involved in the present invention is simple, and the prices of raw materials are cheap, there is good industrial applications prospect.
Description
Technical field
The invention belongs to technical field of atmospheric pollution control, and in particular to a kind of double-perovskite type metal composite oxide is urged
Agent and the preparation method and application thereof.
Background technique
Volatile organic compounds (VOCs), refers to volatile at normal temperatures and pressures, and saturated vapour pressure is more than 70Pa or boiling
O'clock between 50~260 DEG C of non-methane organic compound general name.Wherein, volatile organic contaminant containing chlorine (CVOCs) is
Most common one kind in VOCs mainly includes chlorobenzene, methylene chloride, carbon tetrachloride, dichloroethanes, trichloroethanes etc..1,2- bis-
Chloroethanes (DCE) is a kind of colourless liquid for having chloroform taste, is slightly soluble in water.It is a kind of important chemical raw material, is raw
Produce the intermediate of vinyl chloride, 1,1,1- trichloroethanes, trichloro ethylene and tetrachloro-ethylene；Being also used as industrial products, (metal is de-
Rouge agent) solvent；DCE can be also used for the lead in removal gasoline, clean textile fabric and industrial equipment, and processing animals fat kills
Worm agent and drug etc..It is reported that the DCE of annual 3000000 tons of the mean consumption of China, wherein 90% or more DCE be used to produce
Vinyl chloride (VC).
The discharge of a large amount of CVOCs, not only causes atmosphere quality to decline, but also the CVOCs for entering human body can be destroyed
The immune system of human body has an impact the function of kidney and respiratory system, increases human body (brain, pancreas, lymph, hematopoiesis stomach function regulating
The tissues such as portion and organ) carcinogenic risk.In " planning of key area prevention and control of air pollution " 12th Five-Year Plan " ", it is desirable that carrying out two
It is newly-increased that the control of smoke-dust and volatile organic contaminant (VOCs) is wanted on the basis of sulfur oxide, nitrogen oxides overall control
It asks.2015, Environmental Protection Department issued " Environmental Protection Department issues the comprehensive register of environmental protection ", wherein " high pollution, high environment
In risk " product register, more than the 30 kinds of products for generating a large amount of VOCs are contained.
The Treatment process of CVOCs can be divided into absorption method and edman degradation Edman.Absorption method is by pressurizeing, cooling down, and adsorbent absorbs,
The physics modes such as adsorbent get up the CVOCs Fraction collection in industrial waste gas, to realize the process of recycling, such as condense
Method, absorption method and absorption process etc..Edman degradation Edman mainly include photocatalytic method, plasma method, biological treatment, catalysis oxidation
The chemistry such as method or biological means.In view of technical costs problem, high concentration CVOCs takes absorption method to handle, the use of low concentration
Edman degradation Edman processing.Highly selective (the desired product CO of catalytic oxidation2、H2O、Cl2And HCl) it can greatly reduce the product of CVOCs
Toxicity reaches the smallest environmental disruption.The research and development of inexpensive high thermal stability and chlorine resistance material are industrial CVOCs high
Imitate one of the bottleneck problem of control.Chlorine species in CVOCs decomposition product are easily distributed with the active group on most of catalyst
Raw reaction destroys active phase, reduces catalyst activity.Flue-gas temperature in the industrial productions such as metallurgy, chemical industry, building materials is higher than 300
DEG C, (industrial heat accumulating type catalytic combustion method (RCO) operation temperature is often beyond 500 DEG C), Typical precious metal catalyst or transition are golden
Category oxide catalyst is run under this hot environment for a long time easily leads to sintering of catalyst and inactivation.
Summary of the invention
In order to overcome the problems of the above-mentioned prior art, the purpose of the present invention is to provide a kind of double-perovskite type is compound
Metal oxide catalyst and the preparation method and application thereof, the catalyst have in excellent high temperature resistant, water resistant impact and anti-chlorine
Toxicity energy；The preparation method is easy to operate, and raw material is easy to get, and is suitble to large-scale production；The catalyst can be applied to industrial smoke
The efficient oxidation of middle CVOCs removes.
The present invention is to be achieved through the following technical solutions:
A kind of double-perovskite type O composite metallic oxide catalyst, the double-perovskite type O composite metallic oxide catalyst
Skeleton symbol is A2B2O6, A are La, Sr or Ce, and B are Mn, Fe, Co, Cu or Ni.
On the surface of the double-perovskite type O composite metallic oxide catalyst, progress transition metal oxide is loaded modified,
The load capacity of transition metal oxide is the oxo transition metal of double-perovskite type O composite metallic oxide catalyst quality and load
The 5~20% of compound quality summation.
The transition metal oxide is CrOx、MnOxOr CuOx。
The invention also discloses the method for preparing above-mentioned double-perovskite type O composite metallic oxide catalyst, including it is following
Step:
1) mol ratio of skeleton symbol is pressed, the nitrate or acetate for taking metallic element are dissolved at room temperature as precursor
In water, agitating solution to clear state；
2) press citric acid: solution made from step 1) is added in citric acid by the molar ratio of total metal ion number=1~2:1
In, agitating solution to clear state；
3) by solution made from step 2), heating water bath, magnetic agitation to solution are in gel state at 70~90 DEG C；
4) sample made from step 3) dried to 12 at 80~120 DEG C~for 24 hours after, roast 2 at 500~600 DEG C~
4h obtains double-perovskite type O composite metallic oxide catalyst then in 1100-1200 DEG C of 2~4h of roasting.
It further include that loaded modified operation is carried out to obtained double-perovskite type O composite metallic oxide catalyst, specifically such as
Under: double-perovskite type O composite metallic oxide catalyst is impregnated in the chromic nitrate or copper nitrate solution of 0.5~1.5mol/L,
After 10-30min is stirred at room temperature, at 80~120 DEG C dry 12~for 24 hours, then at 500~600 DEG C roast 4~5h, obtain
Loaded modified double-perovskite type O composite metallic oxide catalyst.
The invention also discloses above-mentioned double-perovskite type O composite metallic oxide catalysts to decline in industrial high temperature environment
Application in solution volatile organic compounds containing chlorine CVOCs.
At 500~600 DEG C, reaction velocity 20000-30000h-1, under the conditions of oxygen concentration is 10-20%, it is described double
Ca-Ti ore type O composite metallic oxide catalyst catalysis oxidation 1, the efficiency of 2- dichloroethanes reaches 100%.
Under 500~550 DEG C and 2%~5% existence condition of steam, the double-perovskite type O composite metallic oxide catalyst
With stable chlorine resistance, heat-resisting quantity and water-resistance.
Compared with prior art, the invention has the following beneficial technical effects:
Double-perovskite type O composite metallic oxide catalyst disclosed by the invention, skeleton symbol A2B2O6, wherein A can be alkali
Soil or rare earth metal (La, Sr, Ce), B can be transition metal element (Mn, Fe, Co, Cu, Ni).The catalyst has excellent
Heat-resisting quantity, water-resistance and resistance against chlorine, successive reaction 700min rear catalyst activity and selectivity is without being decreased obviously.It can answer
Effective degradation for CVOCs under industrial high temperature environment.Further, carrying transition metal oxidation is carried out in the catalyst surface
Object (CrOx、MnOx、CuOx) optimization modification, by the load capacity of modulation transition metal oxide, it can effectively improve catalyst
Oxidation efficiency increases substantially reaction product CO2Selectivity.
Meanwhile double-perovskite type O composite metallic oxide catalyst synthetic method disclosed in this invention is simple, raw material
It is cheap, there is good industrial applications prospect.
Double-perovskite type O composite metallic oxide catalyst disclosed by the invention can be efficiently applied to industrial high temperature environment
The lower degradation CVOCs of volatile organic compounds containing chlorine, reaction temperature be 500-550 DEG C, reaction velocity 20000-30000h-1, oxygen concentration 10-20%, the efficiency of catalysis oxidation 1,2- dichloroethanes reaches 100%.And at high temperature (500-550 DEG C)
Under steam (2-5%) existence condition, excellent stability can be kept for a long time.
Detailed description of the invention
Fig. 1 is double-perovskite type catalyst La of the invention2CuNiO6, LaCeFeCoO6, LaSrMnCoO6, 10CuOx/
LaSrMnCoO6And 10CrOx/LaSrMnCoO6Active testing curve；
Fig. 2 is double-perovskite type catalyst 10CrOx/LaSrMnCoO in the present invention6Stability test curve
(700min)。
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Embodiment 1
Firstly, it is presoma that 2:1:1, which weighs lanthanum nitrate, copper acetate and nickel nitrate, in molar ratio, room-temperature dissolution is gone in 10mL
In ionized water, agitating solution to clear state；Then, according to citric acid: total metal ion number (molar ratio)=1.5, by lemon
Acid is added in above-mentioned solution, agitating solution to clear state；Later, by acquired solution, the water-bath at 70 DEG C, magnetic agitation is to molten
Liquid is in gel state；Then, gel is dried for 24 hours at 100 DEG C；Obtained solid is finally roasted into 4h at 500 DEG C, 1100
DEG C roasting 4h, be down to room temperature, gained catalyst is denoted as La2CuNiO6。
Catalysis reaction carries out in fixed bed, takes the La of 0.5g2CuNiO6, (DCE) is made as probe gas with 1,2- dichloroethanes
The concentration of body, reactant is controlled in 400ppm, reaction velocity 24000h-1, oxygen concentration 20%, reaction is in each temperature spot
40min is kept, reaction product is analyzed through gas-chromatography and on-line mass spectroscopy.The experimental results showed that 200 DEG C, 250 DEG C, 300 DEG C,
At 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C and 550 DEG C, transformation efficiency is respectively 0%, 8%, 10%, 30%, 32%, 41%,
50% and 56% or so.
Embodiment 2
Firstly, it is presoma, room-temperature dissolution that 1:1:1:1, which weighs lanthanum nitrate, cerous nitrate, ferric nitrate and cobalt nitrate, in molar ratio
In 10mL deionized water, agitating solution to clear state；Then, according to citric acid: total metal ion number (molar ratio)=
1.5, citric acid is added in above-mentioned solution, agitating solution to clear state；Later, by acquired solution, the water-bath at 70 DEG C, magnetic
Power is stirred to solution in gel state；Then, gel is dried for 24 hours at 100 DEG C；Finally obtained solid is roasted at 500 DEG C
It burns 4h and is down to room temperature, gained catalyst is denoted as LaCeFeCoO in 1100 DEG C of roasting 4h6；
Catalysis reaction carries out in fixed bed, takes the LaCeFeCoO of 0.5g6, equally using DCE as probe gas, reaction
Condition and embodiment 1 are identical, the experimental results showed that, at 200 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C and
At 550 DEG C, the changing effect of catalyst is respectively 0%, 9%, 13%, 32%, 35%, 43%, 53%, 62% or so.
Embodiment 3
Firstly, it is presoma, room-temperature dissolution that 1:1:1:1, which weighs lanthanum nitrate, strontium nitrate, manganese acetate and cobalt nitrate, in molar ratio
In 10mL deionized water, agitating solution to clear state；Then, according to citric acid: total metal ion number (molar ratio)=
1.5, citric acid is added in above-mentioned solution, agitating solution to clear state；Later, by acquired solution, the water-bath at 70 DEG C, magnetic
Power is stirred to solution in gel state；Then, gel is dried for 24 hours at 100 DEG C；Finally obtained solid is roasted at 550 DEG C
It burns 4h and is down to room temperature, gained catalyst is denoted as LaSrMnCoO in 1100 DEG C of roasting 4h6；
Catalysis reaction carries out in fixed bed, takes the LaSrMnCoO of 0.5g6, equally using DCE as probe gas, reaction
Condition and embodiment 1 are identical, the experimental results showed that, at 200 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C and
At 550 DEG C, the changing effect of catalyst is respectively 0%, 10%, 13%, 35%, 38%, 46%, 55% and 68% or so,
CO at 550 DEG C2Selectivity can reach 40% or more, HCl selectivity be 23% or so.
Embodiment 4
The copper nitrate solution of 5mL0.8mol/L is taken first, and the LaSrMnCoO prepared in 2g embodiment 3 is added6, room temperature stirs
Mix 30min；Then, by gained sample in 80 DEG C of drying 12h；Finally, by resulting solid in Muffle furnace 500 DEG C of roasting 4h,
It is down to room temperature, gained catalyst is denoted as 10CuOx/LaSrMnCoO6。
Using DCE as probe gas, 0.5g10CuO is takenx/LaSrMnCoO6, other conditions and embodiment 1 are identical, live
Property test, temperature be 200 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C, 550 DEG C under the conditions of, conversion ratio is
8%, 12%, 38%, 50%, 86%, 92%, 96% and 100%, CO under the conditions of 550 DEG C2Selectivity reach 68% a left side
The right side, the selectivity 50% or so of HCl, it will be apparent that improve CO2With the selectivity of HCl.
Embodiment 5
The chromium nitrate solution of 5mL 0.8mol/L is taken first, and the LaSrMnCoO prepared in 2g embodiment 3 is added6, room temperature stirs
Mix 30min；Then, by gained sample in 80 DEG C of drying 12h；Finally, by resulting solid in Muffle furnace 500 DEG C of roasting 4h,
It is down to room temperature, gained catalyst is denoted as 10CrOx/LaSrMnCoO6。
Using DCE as probe gas, the 10CrOx/LaSrMnCoO of 0.5g is taken6, other conditions and embodiment 1 are identical, into
Row active testing, under the conditions of temperature is 200 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C, conversion ratio is
9%, 18%, 40%, 70%, 90%, 98% and 100% or so, CO under the conditions of 550 DEG C2Selectivity reach 70% or so,
The selectivity of HCl is 56% or so, it will be apparent that improves CO2With the selectivity of HCl.
Double-perovskite type catalyst La made from above each embodiment2CuNiO6, LaCeFeCoO6, LaSrMnCoO6,
10CuOx/LaSrMnCoO6And 10CrOx/LaSrMnCoO6Active testing curve is referring to Fig. 1.
Embodiment 6
The stability test of catalyst is maintained and is carried out at 550 DEG C, and the other conditions of reaction is selected to remain unchanged (with implementation
Example 1 is identical), 10CrOx/LaSrMnCoO6Show excellent stability.Referring to fig. 2, reaction is after 250min, catalysis
Agent activity can still keep 97% or so, and later, reaction proceeds to 700min or so, and catalyst activity remains to 80% or so, table
Excellent high temperature resistant and anti-chlorine stability are revealed.
Embodiment 7
The water resistance test of catalyst carries out in fixed bed, catalyst choice 10CrOx/LaSrMnCoO6Reaction temperature
Degree is maintained at 550 DEG C, other test conditions are same as Example 1, and steam blows into reactor by constant temperature Bubbling method, pass through quality
Flowmeter controls the content of steam, and the content of steam is 2-5% or so, and by 120min, catalyst activity is decreased obviously, and keeps
95% or so；Steam activation recovering is closed to 98% or so, later, increases the content of steam, reactivity drops to 90%
Left and right；Close steam, the activation recovering of catalyst to 93% or so.
In conclusion catalyst disclosed by the invention has excellent heat-resisting quantity, water-resistance and resistance against chlorine, Ke Yiying
Effective degradation for CVOCs under industrial high temperature environment.The catalyst is reaction temperature is 500-550 DEG C, reaction velocity is
20000-30000h-1, oxygen concentration be 10-20% under the conditions of can be achieved Typical Industrial CVOCs (1,2- dichloroethanes) it is complete
Oxidation.The load capacity for passing through modulation transition metal oxide simultaneously, can effectively improve the oxidation efficiency of catalyst, significantly mention
High reaction product CO2Selectivity.The catalysis material has good thermal stability and water resistant impact capacity, successive reaction
700min rear catalyst activity and selectivity is without being decreased obviously.Meanwhile process for synthetic catalyst involved in the present invention is simple, former material
Expect cheap, there is good industrial applications prospect.
Claims (5)
1. a kind of loaded modified double-perovskite type O composite metallic oxide catalyst, which is characterized in that double-perovskite type is compound
The skeleton symbol of metal oxide catalyst is A2B2O6, A are La, Sr or Ce, and B are Mn, Fe, Co, Cu or Ni；In double calcium
The surface progress transition metal oxide of titanium ore type O composite metallic oxide catalyst is loaded modified, and transition metal oxide is born
Carrying capacity be the transition metal oxide quality summation of double-perovskite type O composite metallic oxide catalyst quality and load 5~
20%；The transition metal oxide is CrOx、MnOxOr CuOx；
The double-perovskite type O composite metallic oxide catalyst is made by following methods:
1) mol ratio of skeleton symbol is pressed, the nitrate or acetate for taking metallic element are dissolved in the water at room temperature as presoma,
Agitating solution is to clear state；
2) press citric acid: citric acid is added in solution made from step 1), stirs by the molar ratio of total metal ion number=1~2:1
Solution is mixed to clear state；
3) by solution made from step 2), heating water bath, magnetic agitation to solution are in gel state at 70~90 DEG C；
4) sample made from step 3) dried to 12 at 80~120 DEG C~for 24 hours after, 2~4h is roasted at 500~600 DEG C, so
Afterwards in 1100-1200 DEG C of 2~4h of roasting, double-perovskite type O composite metallic oxide catalyst is obtained.
2. the method for preparing loaded modified double-perovskite type O composite metallic oxide catalyst described in claim 1, special
Sign is, comprising the following steps:
1) mol ratio of skeleton symbol is pressed, the nitrate or acetate for taking metallic element are dissolved in the water at room temperature as presoma,
Agitating solution is to clear state；
2) press citric acid: citric acid is added in solution made from step 1), stirs by the molar ratio of total metal ion number=1~2:1
Solution is mixed to clear state；
3) by solution made from step 2), heating water bath, magnetic agitation to solution are in gel state at 70~90 DEG C；
4) sample made from step 3) dried to 12 at 80~120 DEG C~for 24 hours after, 2~4h is roasted at 500~600 DEG C, so
Afterwards in 1100-1200 DEG C of 2~4h of roasting, double-perovskite type O composite metallic oxide catalyst is obtained；
Double-perovskite type O composite metallic oxide catalyst is impregnated in the chromic nitrate or copper nitrate solution of 0.5~1.5mol/L
In, after 10-30min is stirred at room temperature, at 80~120 DEG C dry 12~for 24 hours, then at 500~600 DEG C roast 4~5h, obtain
To loaded modified double-perovskite type O composite metallic oxide catalyst.
3. loaded modified double-perovskite type O composite metallic oxide catalyst described in claim 1 is under industrial high temperature environment
Application in the degradation CVOCs of volatile organic compounds containing chlorine.
4. application as claimed in claim 3, which is characterized in that at 500~600 DEG C, reaction velocity 20000-30000h-1, under the conditions of oxygen concentration is 10-20%, the loaded modified double-perovskite type O composite metallic oxide catalyst is catalyzed oxygen
The efficiency for changing 1,2- dichloroethanes reaches 100%.
5. application as claimed in claim 3, which is characterized in that under 500~550 DEG C and 2%~5% existence condition of steam,
The loaded modified double-perovskite type O composite metallic oxide catalyst has stable chlorine resistance, heat-resisting quantity and water-resistance.
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