CN108031472A - A kind of Pd-Pt catalyst for purifying organic waste gas and preparation method thereof - Google Patents
A kind of Pd-Pt catalyst for purifying organic waste gas and preparation method thereof Download PDFInfo
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- CN108031472A CN108031472A CN201711325273.3A CN201711325273A CN108031472A CN 108031472 A CN108031472 A CN 108031472A CN 201711325273 A CN201711325273 A CN 201711325273A CN 108031472 A CN108031472 A CN 108031472A
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- waste gas
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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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- 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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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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
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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 present invention relates to a kind of Pd Pt catalyst for purifying organic waste gas and preparation method thereof, which coats Al using cordierite ceramic honeycomb as carrier, using infusion process2O3、CeO2、ZrO2、La2O3With precious metals pd, Pt, the Al of every liter of catalyst coating2O3、CeO2、ZrO2、La2O3Gross mass be 15~50g, the gross mass of Pd, Pt are every liter of 0.5~2.5g of catalyst, and preparation process includes：The pretreatment of carrier, the preparation of coating paste, the coating of coating paste；The present invention has the features such as simple production process, catalyst activity is high, service life is long.
Description
Technical field
The present invention relates to a kind of Pd-Pt catalyst for purifying organic waste gas and preparation method thereof, have particularly suitable for volatility
The purification treatment of machine exhaust emission, belongs to catalyst technical field.
Background technology
In China, volatile organic matter refers under room temperature that saturated vapor pressure is more than under 70Pa, normal pressure boiling point below 260 DEG C
Organic compound, or vapour pressure is more than or equal to 10Pa and has corresponding volatile whole organic compounds under the conditions of 20 DEG C
Thing.Therefore, it can all produce and wave in industries such as petrochemical industry, printing, spraying, doctorization, electronics, furniture processing, house ornamentation, coating material productions
Hair property organic matter, people contact these materials occur headache, nausea phenomena such as, Long Term Contact may damage people liver,
The function of kidney and other organs, seriously affects the health of people, therefore how volatile organic matter is effectively administered, and subtracts
Gently or its influence to environment is eliminated, be a major fields of current Environmental Protection in China work.
The administering method of volatile organic waste gas mainly has absorption method, heating power burning method, catalytic oxidation, low-temperature plasma
Body method etc..Absorption method is directly condensed exhaust gas or by being condensed after sorbing material Adsorption Concentration, and condensate liquid has through separation and recovery
The organic matter of value, is suitable for handling high-concentration organic waste gas, but equipment investment is big, its operating cost is higher.Heating power burns
Method refers to that organic exhaust gas burns under 700~850 DEG C of high temperature, and the combustible in exhaust gas changes into carbon dioxide and vapor, its
Shortcoming is that fuel cost is big, reaction is also easy to produce NOx He bioxin, causes secondary pollution, and there are larger security risk.Urge
Change oxidizing process and refer to that under the action of catalyst the catalysis oxidation at 250~400 DEG C of the organic exhaust gas in tail gas changes into dioxy
Change carbon, vapor etc., the technology purification efficiency is high, and reaction temperature is than heating power burning method Di Ji Baidu, and application field is wider, shortcoming
It is that catalyst is expensive and easy poisoning, equipment investment are larger.Low temperature plasma method is using during dielectric barrier discharge
What is produced contains high chemically active particle, the pollutant in such as electronics, ion, free radical and excited state molecule, with exhaust gas
Qualitative response, is eventually converted into low molecular compound, CO2And H2The materials such as O, so as to achieve the purpose that to purify exhaust gas, its main feature is that throwing
Money saves, but organic matter purification efficiency is low.
It is increasingly stringent with national environmental protection regulation, enterprise for organic matter in organic exhaust gas purification efficiency increasingly
Height, due to the advantages that catalytic oxidation organic matter purification efficiency is high, non-secondary pollution, is increasingly paid close attention to be subject to user, is applied
Scope is also more and more wider.
Catalyst for organic waste-gas purification can divide honeycombed catalyst and pellet type catalyst according to shape, according to
Active component can be divided into non-precious metal catalyst, noble metal catalyst, noble metal base metal composite catalyst.Graininess is urged
Agent is generally using aluminium oxide as carrier, and load Pd, Pt, Cu, Mn isoreactivity component is prepared, which is generally soaked using carrier
The method steeped in active component solution is prepared, its technique is simple, and shortcoming is due to that active component solution was typically all
Amount, loss of active component can be caused in manufacturing process.Honeycombed catalyst is generally with cordierite ceramic honeycomb or regular gold
It is carrier to belong to base honeycomb, and Supported alumina, co-catalyst and active component Pd, Pt, Rh, Cu, Mn etc. are prepared, making step
General first coating alumina, cerium zirconium sosoloid etc. are used as transition zone on carrier, active component are then coated with, the drawback is that oxygen
Change aluminium, cerium zirconium sosoloid etc. to be not easy to be uniformly dispersed, catalyst surface is easy to fall off, influences the performance of catalyst.
The content of the invention
The technical problem to be solved in the present invention is the deficiency for existing catalyst for purifying organic waste gas and preparation method thereof,
Catalyst for purifying organic waste gas of a kind of simple production process, activity height, service life length and preparation method thereof is provided.
The present invention coats Al using cordierite ceramic honeycomb as carrier, using infusion process2O3、CeO2、ZrO2、La2O3With it is expensive
Metal Pd, Pt, the Al of every liter of catalyst coating2O3、CeO2、ZrO2、La2O3Gross mass be 15~50g, the gross mass of Pd, Pt
For every liter of 0.5~2.5g of catalyst.
The preparation method of catalyst of the present invention, three steps of its preparation process point：
(1) pretreatment of carrier：
When small with the compressed air purging cordierite ceramic honeycomb 0.1~1 of 0.1~0.3MPa, to remove carrier surface
Dust, purge it is clean after it is spare.
(2) preparation of coating paste：
Alumina sol according to a certain ratio, cerous nitrate, zirconium nitrate, lanthanum acetate, deionized water are put into tank diameter, used
Blender stirs evenly, then toward nitric acid is added in solution, pH is between 2~3 for adjustment, and solution A is made；By nitre according to a certain ratio
Sour palladium, platinum nitrate, deionized water are put into tank diameter, are stirred evenly with blender, then toward nitric acid is added in solution, adjustment pH exists
Between 2~3, B solution is made.
(3) coating of coating paste：
Step (1) pretreated cordierite ceramic honeycomb is impregnated into solution A made from step (2), 5~, 20s
After take out, blown away with compressed air in duct and the unnecessary solution of carrier outer wall, stand 1~2 it is small when after be put into baking oven, pass through
120 DEG C of dry 1~2h, then temperature programming is to 550 DEG C, and 3h is kept the temperature, taken out after carrier cooling, then carrier impregnation to step
(2) in B solution made from, taken out after 5~20s, blown away with compressed air in duct with the unnecessary solution of carrier outer wall, stand 1
~2 it is small when after be put into baking oven, through 120 DEG C of dry 1~2h, then temperature programming is to 550 DEG C, and keeps the temperature 3h, is taken out after cooling, i.e.,
Catalyst is made.
A kind of preparation method of above-mentioned Pd-Pt catalyst for purifying organic waste gas, it is characterised in that the alumina sol
The mass content of middle aluminium oxide is 9.8~10.2%.
A kind of Pd-Pt catalyst for purifying organic waste gas provided by the present invention and preparation method thereof, the advantage is that：Prepare
Technique is simple, catalyst activity is high, service life length, and the catalytic purification particularly suitable for organic exhaust gas is administered.
Embodiment
Embodiment 1
10 liters of cordierite ceramic honeycombs are taken, its appearance and size is 100 × 100 × 50mm, and number of aperture is 200/in2,
When small with the compressed air purging cordierite ceramic honeycomb 0.1~1 of 0.1~0.3MPa, to remove the dust of carrier surface, blow
Sweep clean rear spare.Alumina sol 1500g is weighed (by Al2O3Be calculated as 150g), cerous nitrate 545.4g is (by CeO2It is calculated as
216g), zirconium nitrate 188.1g (presses ZrO2Be calculated as 54g), lanthanum acetate 71.4g is (by La2O3Be calculated as 30g), deionized water 300g
It is put into tank diameter, is stirred evenly with blender, then toward nitric acid is added in solution, pH is between 2~3 for adjustment, and solution A is made；
Palladium nitrate solution 60g (being calculated as 9g by Pd), platinum nitrate solution 30g (being calculated as 3g by Pt) are weighed, deionized water 2310g is put into
In tank diameter, stirred evenly with blender, then toward nitric acid is added in solution, pH is between 2~3 for adjustment, and B solution is made.Pre-
Cordierite ceramic honeycomb after processing is impregnated into obtained solution A, is taken out after 5~20s, is blown away with compressed air in duct
The unnecessary solution with carrier outer wall, stand 1~2 it is small when after be put into baking oven, through 120 DEG C of dry 1~2h, then temperature programming is extremely
550 DEG C, and 3h is kept the temperature, taken out after carrier cooling；Then carrier impregnation is taken out into obtained B solution after 5~20s, with pressure
Contracting air is blown away in duct and the unnecessary solution of carrier outer wall, stand 1~2 it is small when after be put into baking oven, through 120 DEG C dry 1~
2h, then temperature programming is to 550 DEG C, and 3h is kept the temperature, taken out after cooling, that is, catalyst is made.Remaining A, B coating paste and system
The catalyst obtained is weighed respectively, and the Al coated in every liter of catalyst is calculated2O3、CeO2、ZrO2、La2O3Gross mass be
The gross mass of 18g, Pd, Pt are every liter of catalyst 0.8g.Mould is used as after being mixed respectively by the use of ethyl acetate, dimethylbenzene, acetone air
Intend gas, in air speed 15000h-1, the performance of catalyst has been investigated, catalyst activity evaluation result is shown in Table 1.
Embodiment 2
With the same preparation method of embodiment 1, the gross mass of institute's difference Pd, Pt in every liter of catalyst in preparation
For every liter of catalyst 2.0g., catalyst activity appreciation condition is same as Example 1, and catalyst activity evaluation result is shown in Table 2.
Embodiment 3
With the same preparation method of embodiment 1, institute's difference is solution A coating twice, every liter of catalysis is calculated
The Al coated in agent2O3、CeO2、ZrO2、La2O3Gross mass be 40g.Catalyst activity appreciation condition is same as Example 1, urges
Agent Activity evaluation is shown in Table 3.
Embodiment 4
With the same preparation method of embodiment 1, institute's difference is solution A coating twice, every liter of catalysis is calculated
The Al coated in agent2O3、CeO2、ZrO2、La2O3Gross mass be 40g, and the gross mass of Pd, Pt are every in every liter of catalyst
Rise catalyst 2.0g.Catalyst activity appreciation condition is same as Example 1, and catalyst activity evaluation result is shown in Table 4.
It can be seen from the above that the catalyst of the present invention is urged for the organic exhaust gas high conversion rate of simulation, excellent catalytic effect, embodiment 4
Change performance and be better than other two, the present invention has the characteristics that technique is simple, the catalyst activity of preparation is high.
Claims (3)
- A kind of 1. Pd-Pt catalyst for purifying organic waste gas, it is characterised in that：The catalyst is using cordierite ceramic honeycomb as load Body, Al is coated using infusion process2O3、CeO2、ZrO2、La2O3With precious metals pd, Pt, the Al of every liter of catalyst coating2O3、CeO2、 ZrO2、La2O3Gross mass be 15~50g, the gross mass of Pd, Pt are every liter of 0.5~2.5g of catalyst.
- A kind of 2. preparation method of Pd-Pt catalyst for purifying organic waste gas according to claim 1, it is characterised in that system Standby step includes：(1) pretreatment of carrierWhen small with the compressed air purging cordierite ceramic honeycomb 0.1~1 of 0.1~0.3MPa, to remove the ash of carrier surface Dirt, purges clean rear spare；(2) preparation of coating pasteAlumina sol according to a certain ratio, cerous nitrate, zirconium nitrate, lanthanum acetate, deionized water are put into tank diameter, with stirring Device stirs evenly, then toward nitric acid is added in solution, pH is between 2~3 for adjustment, and solution A is made；By nitric acid according to a certain ratio Palladium, platinum nitrate, deionized water are put into tank diameter, are stirred evenly with blender, then toward nitric acid is added in solution, pH is 2 for adjustment Between~3, B solution is made；(3) coating of coating pasteStep (1) pretreated cordierite ceramic honeycomb is impregnated into solution A made from step (2), is taken after 5~20s Go out, blown away with compressed air in duct and the unnecessary solution of carrier outer wall, stand 1~2 it is small when after be put into baking oven, through 120 DEG C 1~2h, then temperature programming are dried to 550 DEG C, and keeps the temperature 3h, takes out after carrier cooling, then carrier impregnation to step (2) is made In the B solution obtained, taken out after 5~20s, blown away with compressed air in duct and the unnecessary solution of carrier outer wall, standing 1~2 are small When after be put into baking oven, through 120 DEG C of dry 1~2h, then temperature programming is to 550 DEG C, and keeps the temperature 3h, takes out, that is, is made after cooling Catalyst.
- 3. the preparation method of a kind of Pd-Pt catalyst for purifying organic waste gas according to claim 2, it is characterised in that described Alumina sol in aluminium oxide mass percentage be 9.8~10.2%.
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Cited By (4)
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| CN108816224A (en) * | 2018-06-26 | 2018-11-16 | 中国天辰工程有限公司 | A kind of catalyst and preparation method handling the exhaust gas in the roasting of sial phosphorus molecular sieve |
| CN110116500A (en) * | 2019-05-05 | 2019-08-13 | 陕西理工大学 | A kind of purification reaction room and its air cleaning unit |
| CN110876944A (en) * | 2019-12-09 | 2020-03-13 | 大连瑞克科技有限公司 | Catalyst for catalytic combustion and preparation method thereof |
| CN112138658A (en) * | 2020-09-30 | 2020-12-29 | 南京工程学院 | Preparation method of integral catalyst for tank tail gas purification |
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| CN110876944A (en) * | 2019-12-09 | 2020-03-13 | 大连瑞克科技有限公司 | Catalyst for catalytic combustion and preparation method thereof |
| CN112138658A (en) * | 2020-09-30 | 2020-12-29 | 南京工程学院 | Preparation method of integral catalyst for tank tail gas purification |
| CN112138658B (en) * | 2020-09-30 | 2023-09-15 | 南京工程学院 | Preparation method of integral catalyst for purifying tank tail gas |
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