CN109289889A - The modified Pt base ammoxidation catalyst and preparation method thereof of itrogenous organic substance electronic auxiliary - Google Patents
The modified Pt base ammoxidation catalyst and preparation method thereof of itrogenous organic substance electronic auxiliary Download PDFInfo
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- CN109289889A CN109289889A CN201811117649.6A CN201811117649A CN109289889A CN 109289889 A CN109289889 A CN 109289889A CN 201811117649 A CN201811117649 A CN 201811117649A CN 109289889 A CN109289889 A CN 109289889A
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9436—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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Abstract
The present invention provides a kind of Pt base ammoxidation catalyst and preparation method thereof that itrogenous organic substance electronic auxiliary is modified, molar ratio according to the Pt in itrogenous organic substance and Pt presoma is (1~5): 1, it takes presoma and prepares presoma Pt solution, presoma Pt solution and itrogenous organic substance solution are mixed, at room temperature hybrid reaction；Reaction solution obtained by step is impregnated on carrier material according to equi-volume impregnating, roasts 1~5h at 300 DEG C~600 DEG C after dry to obtain the final product.The present invention improves Pt base catalyst n H3The low temperature active of-SCO solves the NH of low temperature leakage in heavy-duty diesel oil tail gas3Problem.
Description
Technical field
The invention belongs to diesel car tail gas refining catalyst field, in particular to a kind of Pt base diesel car tail gas refining ammonia oxygen
Change catalyst (NH3-SCO)。
Background technique
As the development of diesel vehicle technology and national policy are supported, in recent years China's diesel vehicle market portion by
Cumulative to add, vehicle guaranteeding organic quantity also increases year by year, and a large amount of motor vehicle exhaust emissions cause the same of certain environmental pollution into atmosphere
When, certain threat is also caused to human health.
NH3As a kind of irritating toxic gas, sucking is excessive to cause certain injury to human respiratory, together
When will lead to a series of complication.As haze is increasingly severe, people are higher and higher to air quality requirements.Emission regulation pair
NH3Discharge be made that specific regulation, clear stipulaties NH in Europe VI3Emission limit be 10ppm, ammoxidation catalyst (NH3-
SCO) it is used as special purifying tail gas of diesel vehicles NH3Catalyst in exhaust gas from diesel vehicle after-treatment system in occupation of important position
It sets.
Ammoxidation catalyst is located at diesel vehicle NH3The rear end of SCR catalyst, for handling NH3Selective Catalytic Reduction of NOx
(NH3- SCR) NH that leaks at low temperature of catalyst rear end3.Since ammoxidation catalyst only accounts in diesel vehicle after-treatment device
According to minimum area, therefore it is required that ammoxidation catalyst has high activity to ammoxidation under high-speed, low temperature, while to select
Property generates non-hazardous N2, low by-product generates.
The prior art indicate that noble metal catalyst (such as Pt, Pd, Rh, Ru, Ag) and multicomponent noble metal combination (such as
Pt-Rh or Pt-Pd-Rh) there is efficient low temperature ammoxidation activity, but since noble metal is expensive, large-scale application by
To limitation, therefore high activity low precious metal content catalyst need to be developed.Due to NH3In NH3Leakage temperature in-SCR is lower, catalysis
The low temperature active of agent still needs to further increase.
Summary of the invention
It is an object of that present invention to provide a kind of modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary and its systems
Preparation Method, to improve Pt base catalyst n H3The low temperature active of-SCO solves the NH of low temperature leakage in heavy-duty diesel oil tail gas3It asks
Topic.
The preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary provided by the invention, including with
Lower step:
(1) it is (1~5) according to the molar ratio of the Pt in itrogenous organic substance and Pt presoma: 1, before taking presoma and preparing
Body Pt solution is driven, presoma Pt solution and itrogenous organic substance solution are mixed, at room temperature hybrid reaction；
(2) reaction solution obtained by step (1) is impregnated on carrier material according to equi-volume impregnating, at 60~120 DEG C
Dry 10~12h；
(3) 1~5h is roasted at 300 DEG C~600 DEG C of mixture by step (2) after dry, obtains itrogenous organic substance electronics
The Pt base ammoxidation catalyst of additive modification.
Further, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared in step (1) is 0.5
~1.5%.
Further, step (1) is described takes presoma Pt solution for Pt (NO3)2, H2PtCl6,K2PtCl4, Pt (acac)2
At least one of.
Further, step (1) itrogenous organic substance be selected from triethylamine, imidazoles, ethylenediamine, ethylenediamine tetra-acetic acid, three
At least one of methylamine.
Further, step (1) reaction time is 30-60min；
Further, during step (2) incipient impregnation, 20-40min is stirred, 12-24h is then allowed to stand.
Further, step (2) carrier material is silica-alumina supports.
Further, step (2) drying is to obtain itrogenous organic substance electronic auxiliary in 60~120 DEG C of dry 10~12h and change
The Pt base ammoxidation catalyst powder of property.
The modified Pt base ammoxidation catalyst powder of itrogenous organic substance electronic auxiliary of the present invention, when use, preferably prepare
Integral formula catalyst, the method is as follows:
(1) Pt base ammoxidation catalyst powder and binder, acidity tune that gained itrogenous organic substance electronic auxiliary is modified
Section agent, water, which are uniformly mixed, is made coating slurries, and control slurry solid content is 30%~40%；
(2) by gained coating slurries be uniformly coated on cordierite honeycomb ceramic matrix, control catalyst fines
Upper carrying capacity on cordierite is 130~180g/L；
(3) matrix after coating is gradually warming up to 60~120 DEG C by room temperature to be dried, then at 300 DEG C~700 DEG C
Roast 1~5h.
Further, the bonding agent is one of boehmite, acetic acid zirconium or silica solution, and additive amount is catalysis
The 2%~4% of agent powder quality.
Further, the acidity regulator is citric acid or acetic acid, and additive amount is 3~5 to be to adjust slurry pH value
It is quasi-.
Further, the porosity of preferred Corning company of the model U.S. production of the cordierite honeycomb ceramic is 400
Mesh/m2Ceramic honeycomb.
The modified Pt base ammoxidation catalyst of itrogenous organic substance provided by the invention, (N representative contains catalyst Pt/SiAl-N
Nitrogen organic) it is coated on cordierite honeycomb ceramic matrix and is prepared into integral catalyzer, catalyst is placed on bavin when use
Oily tail gas after-treatment device NH3The rear end-SCR, can be shown in diesel vehicle use temperature range after high-temperature process compared with
Stable performance.
Compared with prior art, the method for the invention is used as by adding itrogenous organic substance in precursor solution to electricity
Sub- auxiliary agent, the state of Pt, active component Pt in modulation precursor solution0It is great on catalyst activity influence, it adds nitrogenous organic
Pt after object0Species total amount increased significantly, and dispersion degree increases, so that catalyst activity is improved, NH3The initiation temperature of conversion is obvious
It reduces, the catalytic performance of ammoxidation catalyst can be increased substantially.
Detailed description of the invention
Fig. 1 is NH in embodiment 23Conversion vary with temperature figure.
Fig. 2 is the CO-FITR figure of catalyst prepared by embodiment 2.
Fig. 3 is the XRD diagram of catalyst prepared by embodiment 2.
Fig. 4 is the TEM figure of catalyst prepared by embodiment 2.
Fig. 5 is the active assessment device of catalyst prepared by embodiment 2.
Specific embodiment
The present invention will be further described with specific embodiment with reference to the accompanying drawing.
In implementing below, the hole of preferred Corning company of the model U.S. production of cordierite honeycomb ceramic matrix
Gap rate is 400 mesh/m2Ceramic honeycomb.
Embodiment 1
(1) according to itrogenous organic substance triethylamine and Pt presoma Pt (NO3)2In Pt molar ratio be 5:1, measure Pt before
Body is driven, presoma Pt solution is prepared, presoma Pt solution and itrogenous organic substance solution are mixed, mixed at room temperature, stirring is anti-
Answer 30min；Also, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared is 1%；
(2) by reaction solution obtained by step (1) according to isometric (waiting water pore volumes) impregnation to silica-alumina supports material
On, 30min is stirred in dipping process, 12h is stood, then in 120 DEG C of dry 12h；
(3) the 600 DEG C of roasting 3h in Muffle furnace of the mixture by step (2) after dry, obtain itrogenous organic substance electronics and help
The modified Pt base ammoxidation catalyst powder of agent.
Integral catalyzer is made:
(1) by the boehmite of the modified catalyst powder of gained itrogenous organic substance and catalyst powder quality 3% and
Water is uniformly mixed and coating slurries is made, and controls solid content 38%, and adjustment slurry pH value is 4 after acetic acid is added；
(2) gained catalyst pulp is uniformly coated on cordierite honeycomb ceramics matrix, controls the upper of catalyst
Carrying capacity 160g/L；
(3) by the matrix after coating by 60 DEG C of dry 12h, then 550 DEG C of roastings in Muffle furnace in air atmosphere
3h obtains the integral vehicular tai-gas clean-up catalyst with porous structure.
Comparative example 1
In addition to not adding itrogenous organic substance electronic auxiliary in Catalyst precursor solutions, using side same as Example 1
Comparative catalyst is prepared in method.
Embodiment 2
(1) according to itrogenous organic substance ethylenediamine and Pt presoma Pt (NO3)2In Pt molar ratio be 3:1, measure Pt before
Body is driven, presoma Pt solution is prepared, presoma Pt solution and itrogenous organic substance solution are mixed, mixed at room temperature, stirring is anti-
Answer 30min；Also, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared is 1%；
(2) by reaction solution obtained by step (1) according to isometric (waiting water pore volumes) impregnation to silica-alumina supports material
On, 40min is stirred in dipping process, 12h is stood, then in 100 DEG C of dry 12h；
(3) the 600 DEG C of roasting 3h in Muffle furnace of the mixture by step (2) after dry, obtain itrogenous organic substance electronics and help
The modified Pt base ammoxidation catalyst powder of agent.
Integral catalyzer is made:
(1) by the boehmite of the modified catalyst powder of gained itrogenous organic substance and catalyst powder quality 3% and
Water is uniformly mixed and coating slurries is made, and controls solid content 38%, and adjustment slurry pH value is 4 after acetic acid is added；
(2) gained catalyst pulp is uniformly coated on cordierite honeycomb ceramics matrix, controls the upper of catalyst
Carrying capacity 160g/L；
(3) by the matrix after coating by 60 DEG C of dry 12h, then 550 DEG C of roasting 3h in Muffle furnace, are obtained with porous
The integral vehicular tai-gas clean-up catalyst of structure.
Embodiment 3
(1) according to itrogenous organic substance ethylenediamine and Pt presoma Pt (NO3)2In Pt molar ratio be 5:1, measure Pt before
Body is driven, presoma Pt solution is prepared, presoma Pt solution and itrogenous organic substance solution are mixed, mixed at room temperature, stirring is anti-
Answer 60min；Also, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared is 1.5%；
(2) by reaction solution obtained by step (1) according to isometric (waiting water pore volumes) impregnation to silica-alumina supports material
On, 40min is stirred in dipping process, 12h is stood, then in 100 DEG C of dry 12h；
(3) the 600 DEG C of roasting 3h in Muffle furnace of the mixture by step (2) after dry, obtain itrogenous organic substance electronics and help
The modified Pt base ammoxidation catalyst powder of agent.
Integral catalyzer is made:
(1) by the boehmite of the modified catalyst powder of gained itrogenous organic substance and catalyst powder quality 3% and
Water is uniformly mixed and coating slurries is made, and controls solid content 38%, and adjustment slurry pH value is 4 after acetic acid is added；
(2) gained catalyst pulp is uniformly coated on cordierite honeycomb ceramics matrix, controls the upper of catalyst
Carrying capacity 160g/L；
(3) by the matrix after coating by 60 DEG C of dry 12h, then 550 DEG C of roasting 3h in Muffle furnace, are obtained with porous
The integral vehicular tai-gas clean-up catalyst of structure.
Embodiment 4
(1) according to itrogenous organic substance ethylenediamine tetra-acetic acid and Pt presoma H2PtCl6In Pt molar ratio be 1:1, measure
Pt presoma prepares presoma Pt solution, and presoma Pt solution and itrogenous organic substance solution are mixed, mixes, stirs at room temperature
Mix reaction 50min；Also, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared is 0.5%；
(2) by reaction solution obtained by step (1) according to isometric (waiting water pore volumes) impregnation to silica-alumina supports material
On, 40min is stirred in dipping process, 12h is stood, then in 100 DEG C of dry 12h；
(3) the 600 DEG C of roasting 3h in Muffle furnace of the mixture by step (2) after dry, obtain itrogenous organic substance electronics and help
The modified Pt base ammoxidation catalyst powder of agent.
Integral catalyzer is made:
(1) by the boehmite of the modified catalyst powder of gained itrogenous organic substance and catalyst powder quality 3% and
Water is uniformly mixed and coating slurries is made, and controls solid content 38%, and adjustment slurry pH value is 4 after acetic acid is added；
(2) gained catalyst pulp is uniformly coated on cordierite honeycomb ceramics matrix, controls the upper of catalyst
Carrying capacity 160g/L；
(3) by the matrix after coating by 60 DEG C of dry 12h, then 550 DEG C of roasting 3h in Muffle furnace, are obtained with porous
The integral vehicular tai-gas clean-up catalyst of structure.
Embodiment 5
(1) according to itrogenous organic substance ethylenediamine tetra-acetic acid and Pt presoma H2PtCl6In Pt molar ratio be 1:1, measure
Pt presoma prepares presoma Pt solution, and presoma Pt solution and itrogenous organic substance solution are mixed, mixes, stirs at room temperature
Mix reaction 50min；Also, the mass content that the amount of Pt presoma meets Pt in the catalyst finally prepared is 1%；
(2) by reaction solution obtained by step (1) according to isometric (waiting water pore volumes) impregnation to silica-alumina supports material
On, 40min is stirred in dipping process, 12h is stood, then in 100 DEG C of dry 12h；
(3) the 600 DEG C of roasting 3h in Muffle furnace of the mixture by step (2) after dry, obtain itrogenous organic substance electronics and help
The modified Pt base ammoxidation catalyst powder of agent.
Integral catalyzer is made:
(1) by the boehmite of the modified catalyst powder of gained itrogenous organic substance and catalyst powder quality 3% and
Water is uniformly mixed and coating slurries is made, and controls solid content 38%, and adjustment slurry pH value is 4 after acetic acid is added；
(2) gained catalyst pulp is uniformly coated on cordierite honeycomb ceramics matrix, controls the upper of catalyst
Carrying capacity 160g/L；
(3) by the matrix after coating by 60 DEG C of dry 12h, then 550 DEG C of roasting 3h in Muffle furnace, are obtained with porous
The integral vehicular tai-gas clean-up catalyst of structure.
Low temperature active test
1 gained integral catalyzer of embodiment is subjected to catalytic activity investigation, as a comparison with 1 catalyst of comparative example.
Experiment condition: it is carried out in the fixed microreactor continuously flowed of multichannel of laboratory self assembly, activity rating
Device is as shown in figure 5, the exhaust gas from diesel vehicle composition and experiment condition of simulation are shown in Table 1.
The fixed microreactor continuously flowed of the multichannel, by multichannel air inlet pipeline 1, be mounted on every air inlet pipeline
On quality stream measuring device 2, gas mixing pipe road 3, reacting furnace 5, tubular reactor and gas analyzer composition 6, multichannel air inlet pipeline is simultaneously
Connection is connected to gas mixing pipe road, and tubular reactor is entered after mixing, and catalyst 4 is placed in the middle part of tubular reactor, tubular reactor position
In the burner hearth of reacting furnace, it is ensured that be heated evenly in the middle part of tubular type inductor, mixed gas turns in tubular reactor catalyst
After change, into gas analyzer.
Before test, first by integral catalyzer in reaction gas (simulation exhaust gas from diesel vehicle) 500 DEG C of processing 1h, make to be catalyzed
Agent is stablized, and then carries out cooling transient test, in order to prevent NH3Absorption is vented effective heating tape package, and is controlled with temperature controller
Its temperature is at 100 DEG C.Unconverted NO, N2O, NO2Using fourier infrared gas analyzer (Thermol Fisher
Scientific it) is tested.
Simulated exhaust gas condition such as table 1:
Table 1: simulated exhaust gas condition
| Simulated exhaust gas component | Simulated exhaust gas composition |
| NH3 | 200ppm |
| N2 | Balance Air |
| CO2 | 8% |
| O2 | 10% |
| H2O | 5% |
| Air speed | 100000h-1 |
Test result as shown in Figure 1, it can be seen that be added to itrogenous organic substance electronic auxiliary integral catalyzer tool
There is more preferable catalytic activity.NH3Initiation temperature T50(NH3Temperature of conversion ratio when reaching 50%) reduce 12 DEG C.It is nitrogenous to have
N atom in machine object has lone pair electrons pair, can be used as electron auxiliary agent and is added in precursor solution, improves Pt to a certain extent
The cloud density of surrounding, while the itrogenous organic substance has certain alkalinity and reproducibility, can make to exist in system more
Active component Pt0, increase dispersion degree, to improve NH3The low temperature active of-SCO.
Fig. 2 to Fig. 4 is respectively CO-FTIR, XRD and TEM figure of catalyst, in conjunction with picture it is found that nitrogenous having being added to
After machine object electronic auxiliary, active specy Pt possesses smaller particle size, smaller crystallite dimension, while possessing bigger point
Divergence, these results have certain facilitation for the catalytic activity of catalyst, to improve NH3The low temperature of-SCO is living
Property.
Claims (8)
1. the preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary, which is characterized in that including following
Step:
(1) it is (1~5) according to the molar ratio of the Pt in itrogenous organic substance and Pt presoma: 1, it takes presoma and prepares presoma
Pt solution mixes presoma Pt solution and itrogenous organic substance solution, at room temperature hybrid reaction；
(2) reaction solution obtained by step (1) is impregnated on carrier material according to equi-volume impregnating, it is dry at 60~120 DEG C
10~12h；
(3) 1~5h is roasted at 300 DEG C~600 DEG C of mixture by step (2) after dry, obtains itrogenous organic substance electronic auxiliary
Modified Pt base ammoxidation catalyst.
2. the preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary according to claim 1,
It is characterized in that, it is 0.5~1.5% that the amount of Pt presoma, which meets the mass content of Pt in the catalyst finally prepared, in step (1).
3. the preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary according to claim 1,
It is characterized in that, step (1) is described to take presoma Pt solution for Pt (NO3)2, H2PtCl6,K2PtCl4, Pt (acac)2In at least
It is a kind of.
4. the preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary according to claim 1,
It is characterized in that, step (1) itrogenous organic substance is selected from triethylamine, imidazoles, ethylenediamine, ethylenediamine tetra-acetic acid, in trimethylamine
It is at least one.
5. the preparation method of the modified Pt base ammoxidation catalyst of itrogenous organic substance electronic auxiliary according to claim 1,
It is characterized in that, step (1) reaction time is 30-60min.
6. the modified Pt base ammoxidation catalysis of itrogenous organic substance electronic auxiliary described in any claim in -5 according to claim 1
The preparation method of agent, which is characterized in that during step (2) incipient impregnation, stir 20-40min, be then allowed to stand 12-24h.
7. the modified Pt base ammoxidation catalysis of itrogenous organic substance electronic auxiliary described in any claim in -5 according to claim 1
The preparation method of agent, which is characterized in that step (2) carrier material is silica-alumina supports.
8. the modified Pt base ammoxidation catalysis of itrogenous organic substance electronic auxiliary described in any claim in -5 according to claim 1
The preparation method of agent, which is characterized in that step (3) drying is to obtain itrogenous organic substance electronics at 60~120 DEG C dry 10~12
The Pt base ammoxidation catalyst powder of additive modification.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5154089A (en) * | 1974-11-06 | 1976-05-12 | Hitachi Maxell | |
| JPS5154091A (en) * | 1974-11-06 | 1976-05-12 | Hitachi Maxell | |
| CN102513130A (en) * | 2011-12-05 | 2012-06-27 | 广东工业大学 | Preparation method and application of integral combustion catalyst for platinum-based honeycomb iron-chrome-aluminium wire mesh |
-
2018
- 2018-09-21 CN CN201811117649.6A patent/CN109289889B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5154089A (en) * | 1974-11-06 | 1976-05-12 | Hitachi Maxell | |
| JPS5154091A (en) * | 1974-11-06 | 1976-05-12 | Hitachi Maxell | |
| CN102513130A (en) * | 2011-12-05 | 2012-06-27 | 广东工业大学 | Preparation method and application of integral combustion catalyst for platinum-based honeycomb iron-chrome-aluminium wire mesh |
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