CN110508290A - High dispersive palladium/cobalt hydroxide catalyst and its preparation method and application - Google Patents
High dispersive palladium/cobalt hydroxide catalyst and its preparation method and application Download PDFInfo
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- CN110508290A CN110508290A CN201910814713.4A CN201910814713A CN110508290A CN 110508290 A CN110508290 A CN 110508290A CN 201910814713 A CN201910814713 A CN 201910814713A CN 110508290 A CN110508290 A CN 110508290A
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/8906—Iron and noble metals
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0205—Impregnation in several steps
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0213—Preparation of the impregnating solution
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/088—Decomposition of a metal salt
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/02—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation
- C07C5/08—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation of carbon-to-carbon triple bonds
- C07C5/09—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation of carbon-to-carbon triple bonds to carbon-to-carbon double bonds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
- C07C2523/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper
- C07C2523/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of the iron group metals or copper combined with noble metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The present invention provides a kind of high-dispersion Pd/Co (OH)2Catalyst and the preparation method and application thereof, the present invention have prepared the higher Co of specific surface area (OH) by simple method first2Carrier, palladium maceration extract is then then supported on Co (OH) so that carrier surface has more defect sites by operations such as calcinings2On carrier, performance preferably high-dispersion Pd/Co (OH) has been prepared2Catalyst；High-dispersion Pd/Co (OH) of the invention2The application and preparation of catalyst not only has many advantages, such as high catalytic activity and high ethylene selectivity, while it is high also to have excellent stability and atom utilization in selective hydrogenation of acetylene reaction.
Description
(1) technical field
The present invention relates to a kind of high-dispersion Pd/Co (OH)2Catalyst and preparation method thereof, and in selective hydrogenation of acetylene
Application in reaction.
(2) background technique
Ethylene is one of most important chemical products in world wide, is widely used in synthetic plastic, rubber, fibre
The every field such as dimension, medicine, pesticide and dyestuff.Industrial ethylene mainly passes through the cracking of the raw materials such as naphtha and diesel oil and is made,
But the acetylene of about 0.3%-3% is often generated during preparing ethylene gas；These trace acetylenes can poison downstream
The Ziegler-Natta catalyst of polyethylene process can not only reduce the activity and service life of catalyst, and also can be serious
Influence the product quality of polyethylene process.Therefore, removing trace acetylene in unstripped gas has important industrial significance.
The method of industrial common removing acetylene is selection hydrogenation method, with pollution-free, low energy consumption, technical process is simple
The advantages that and be widely used.However, although the palladium-based catalyst of industrial tradition possesses preferably catalytic activity, still
But there is poor ethylene selectivity, it may occur that excessive hydrogenation generates ethane and oligomerization generation green oil occurs either to shadow
Ring the service life of catalyst.Then ethylene selectivity of the palladium-based catalyst in acetylene hydrogenation reaction is for ethylene industry
It is vital, it is therefore desirable to catalyst is modified, prevent ethylene from excessive hydrogenation occurs and generate ethane, to further mention
The selectivity of high ethylene.
The carrier surface of synthesis has defect sites more abundant, so as to higher in conjunction with metal phase.And surface
- OH functional group abundant can effectively be anchored metallic atom, to make metallic atom high dispersive on the surface of the carrier.Synthesis
The acidity of the more typical aluminium oxide of carrier, defect sites is weaker, further improves the selectivity and stability of catalyst.
Based on background above, the invention proposes a kind of high-dispersion Pd/Co (OH)2The preparation of catalyst, to improve palladium base
Selectivity of the catalyst in acetylene hydrogenation reaction.
(3) summary of the invention
The present invention provides a kind of high-dispersion Pd/Co (OH)2Catalyst and preparation method thereof, and add in selective acetylene
Application in hydrogen reaction.Preparation method simple process of the present invention, catalyst obtained can largely improve selective acetylene
Ethylene selectivity in hydrogenation reaction.
Technical scheme is as follows:
A kind of high-dispersion Pd/Co (OH)2Catalyst is prepared as follows to obtain:
(1) it prepares palladium maceration extract: palladium compound is dissolved in solvent, palladium maceration extract is made；
In the palladium maceration extract, concentration of the palladium compound in terms of palladium is 0.001-0.01g/mL；
The palladium compound is palladium acetate, palladium acetylacetonate, dichloro diamino palladium, tetrachloro-palladium acid ammonium, chlorine palladium acid sodium or nitric acid
Four ammino palladiums, preferably palladium acetate；
The solvent can be water, hydrochloric acid, ethyl alcohol, acetone etc., the present invention does not have this depending on the type of palladium compound
There is particular/special requirement；
(2)Co(OH)2The synthesis of carrier: cobalt chloride hexahydrate, precipitating reagent are dissolved in deionized water, stir 0.5h, so
After be added propylene oxide, stir 0.5~5h under room temperature (20~30 DEG C), Precipitation, be placed at 80 DEG C dry 12h, Gu
Body product is washed with methanol and deionized water, and 8~12h is dried at 110 DEG C, is finally putting into Muffle furnace, at 350~700 DEG C
2-6h is roasted, Co (OH) is obtained2Carrier；
The ratio between amount of substance of the cobalt chloride hexahydrate, precipitating reagent, propylene oxide be 1:1~5:1~10, preferably 1:2:
10；
The precipitating reagent is lauryl sodium sulfate, hexa, ammonium nitrate, ammonium fluoride or ammonium chloride, preferably chlorine
Change ammonium；
(3) high-dispersion Pd/Co (OH)2The preparation of catalyst: by Co (OH)2Carrier is immersed in palladium maceration extract, and dispersion is equal
It is even, 9-12h is impregnated at room temperature, and the dry 9-12h at 110-130 DEG C, is subsequently placed into tube furnace, at 300-700 DEG C later
6-10h is calcined, high-dispersion Pd/Co (OH) is obtained2Catalyst；
In the present invention, after the cobalt hydroxide in step (3) is immersed in palladium maceration extract and impregnates 9-12h, system can be placed in
In microwave reactor, the microwave 20-80min at 110-130 DEG C can further promote dispersion of the metal component on carrier, so
Sample is put into 110~130 DEG C of baking ovens dry 9~12h again afterwards, calcining obtains final catalyst later.
In gained catalyst of the invention, the quality based on carrier, load capacity of the palladium compound in terms of palladium is 0.01-
0.5wt%, preferably 0.01-0.1wt%, more preferable 0.01-0.03wt%.
In the preparation method of catalyst of the present invention, palladium compound is regarded as whole loads, those skilled in the art
The additional amount of load capacity the selection palladium compound and carrier that can according to need.
High-dispersion Pd/Co (OH) of the present invention2Catalyst can be applied in acetylene hydrogenation reaction.Specifically, described answer
Method are as follows:
Before selective hydrogenation of acetylene reaction, need first to restore the catalyst with hydrogen, reduction temperature is
130-230 DEG C, time 1-4h；The catalyst after reduction is used for selective hydrogenation of acetylene reaction, reaction condition are as follows: temperature again
60-210 DEG C (preferably 60-150 DEG C), pressure 0.1-1MPa (preferably 0.1-0.3MPa, more preferable normal pressure), air speed 1000-
10000h-1(preferably 4000-8000h-1)；
In the selective hydrogenation of acetylene reaction, the gas composition for reacting initial is (volume fraction): 0.33%C2H2、
0.66%H2, 33.3%C2H4, surplus N2。
Compared with prior art, the beneficial effects of the present invention are:
(1) high-dispersion Pd/Co (OH) of the invention2The preparation of catalyst is to prepare by simple method first
The higher Co of specific surface area (OH)2Carrier, then by calcining etc. operations so that carrier surface has more defect sites.
Then palladium maceration extract is supported on Co (OH)2On carrier, performance preferably high-dispersion Pd/Co (OH) has been prepared2Catalyst.One
Aspect, palladium obtain higher dispersion degree on carrier, this is advantageous acetylene hydrogenation reaction；On the other hand, this carrier
The acidity on surface is lower compared with aluminium oxide, that is to say, that this carrier surface is substantially without middle strong acid site, in acetylene
Less green oil can be generated in hydrogenation reaction, so that the high-dispersion Pd/Co (OH) prepared2Catalyst has higher stabilization
Property；Finally, high-dispersion Pd/Co (OH)2Catalyst surface contains a large amount of hydroxyl group, and this hydroxyl group can more preferably be stablized
Anchoring palladium presence, so that the further high dispersive of palladium be made to be present on catalyst.In addition the anchoring between hydroxyl and palladium be with
Existing for chemical species, hydroxyl can provide electronics transfer to palladium active site, so that electron rich state is presented in palladium activated centre, from
And obtain high ethylene selectivity.
(2) high-dispersion Pd/Co (OH) of the invention2The preparation method of catalyst, simple process.
(3) high-dispersion Pd/Co (OH) of the invention2The application and preparation of catalyst is in selective hydrogenation of acetylene reaction, no
Only there is high catalytic activity and high ethylene selectivity, while it is excellent also to have excellent stability and atom utilization height etc.
Point.
(4) specific embodiment
Below by specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited in
This.
In following embodiment, Co (OH)2Carrier synthesizes as follows:
The precipitating reagent ammonium chloride of the cobalt chloride hexahydrate of 0.01mol, 0.02mol are placed in small beaker, are added a certain amount of
Deionized water to dissolve, stir 0.5h, 0.1mol propylene oxide be then added, stirs 5h at room temperature, Precipitation, postposition
Dry 12h, solid product are washed 3-5 times with methanol and deionized water, dry overnight at 110 DEG C, be finally putting into horse at 80 DEG C
Not in furnace, 6h is roasted at 600 DEG C, obtains Co (OH)2Carrier.
Embodiment 1-5
It weighs a certain amount of palladium acetate to be dissolved in concentrated hydrochloric acid, be transferred in volumetric flask, a certain amount of deionized water is added
To corresponding scale, the mass concentration that palladium is made is the chlorine palladium acid solution of 0.001g/mL.According to load capacity listed by table 2 and its match
Than the chlorine palladium acid solution of metering and a certain amount of deionized water being mixed, after mixing evenly, equably by high dispersive Co (OH)2
(specific surface area is about 150-250m to carrier2/ g) it pours into maceration extract, ultrasound makes it be uniformly dispersed.By the Co (OH) of wetting2It carries
Body is in room temperature immersion 12h, and the dry 12h at 110 DEG C, and after taking out sample, sample is forged under the conditions of 350~700 DEG C
After burning calcining 6h, high-dispersion Pd/Co (OH) is obtained2Catalyst.
Co (OH) in embodiment 42Carrier texture Nature comparison before and after loading Pd is shown in Table 1:
Table 1 loads carrier texture Nature comparison before and after Pd
Embodiment 6
Referring to the operation of embodiment 5, it is 60m that difference, which is only that carrier changes specific surface area into,2The aluminium oxide of/g is made simple
Pd/Al2O3Catalyst.
Embodiment 7
Referring to the operation of embodiment 5, it is 420m that difference, which is only that carrier changes specific surface area into,2Letter is made in the aluminium oxide of/g
Single Pd/Al2O3Catalyst.
Embodiment 8
High-dispersion Pd/Co (OH) prepared by embodiment 22Catalyst in microwave reactor in 100 DEG C of reaction 80min,
Obtain finished catalyst.
Embodiment 9
High-dispersion Pd/Co (OH) prepared by embodiment 52Catalyst in microwave reactor in 120 DEG C of reaction 60min,
Obtain finished catalyst.
Catalyst obtained carries out catalyst activity and selective evaluation according to following method:
0.3g catalyst is placed in small-sized quartz tube reactor, quartz ampoule is placed in the heating mantle of controllable temperature, In
Before selective hydrogenation of acetylene reaction evaluating, catalyst is needed in pure H21h is restored in atmosphere at 180 DEG C, reduction gas velocity is
10mL/min；After reduction, by being reacted at temperature shown in table 2.Reaction gas group becomes (volume fraction): 0.33% acetylene,
The flow velocity of 33.3% ethylene, 0.66% hydrogen, surplus nitrogen, reaction gas is 50mL/min, and reaction pressure is normal pressure.Reaction gas goes out
Mouth connects gas-chromatography on-line checking, and the evaluation result of catalyst see the table below shown in 2.
2 high-dispersion Pds of table/Co (OH)2The selective hydrogenation of acetylene reaction evaluating result of catalyst
Embodiment 10-15
Referring to the preparation method of the catalyst of embodiment 1-5, the load capacity of palladium maceration extract is shown in Table 3, prepares high-dispersion Pd/Co
(OH)2Catalyst.
The evaluation method of catalyst activity and selectivity is same as above, and changes simultaneously the calcination temperature for preparing catalyst and acetylene adds
Reaction temperature in hydrogen reaction, the evaluation result of catalyst see the table below shown in 3.
3 high-dispersion Pds of table/Co (OH)2The selective hydrogenation of acetylene reaction evaluating result of catalyst
Claims (7)
1. a kind of high-dispersion Pd/Co (OH)2Catalyst, which is characterized in that be prepared as follows to obtain:
(1) it prepares palladium maceration extract: palladium compound is dissolved in solvent, palladium maceration extract is made；
The palladium compound is palladium acetate, palladium acetylacetonate, dichloro diamino palladium, four ammonia of tetrachloro-palladium acid ammonium, chlorine palladium acid sodium or nitric acid
Close palladium；
(2)Co(OH)2The synthesis of carrier: cobalt chloride hexahydrate, precipitating reagent are dissolved in deionized water, 0.5h is stirred, is then added
Propylene oxide, stirs 0.5~5h at room temperature, Precipitation, be placed at 80 DEG C dry 12h, solid product methanol and go
Ion water washing dries 8~12h at 110 DEG C, is finally putting into Muffle furnace, roasts 2-6h at 350~700 DEG C, obtain Co
(OH)2Carrier；
The ratio between amount of substance of the cobalt chloride hexahydrate, precipitating reagent, propylene oxide is 1:1~5:1~10；
The precipitating reagent is lauryl sodium sulfate, hexa, ammonium nitrate, ammonium fluoride or ammonium chloride；
(3) high-dispersion Pd/Co (OH)2The preparation of catalyst: by Co (OH)2Carrier is immersed in palladium maceration extract, is uniformly dispersed, room
Temperature is lower to impregnate 9-12h, and the dry 9-12h at 110-130 DEG C, is subsequently placed into tube furnace, calcines 6- at 300-700 DEG C later
10h obtains high-dispersion Pd/Co (OH)2Catalyst.
2. high-dispersion Pd/Co (OH) as described in claim 12Catalyst, which is characterized in that in step (1), the palladium maceration extract
In, concentration of the palladium compound in terms of palladium is 0.001-0.01g/mL.
3. high-dispersion Pd/Co (OH) as described in claim 12Catalyst, which is characterized in that in step (2), the six hydrations chlorine
Changing the ratio between amount of substance of cobalt, precipitating reagent, propylene oxide is 1:2:10.
4. high-dispersion Pd/Co (OH) as described in claim 12Catalyst, which is characterized in that the cobalt hydroxide submergence in step (3)
In palladium maceration extract and after impregnating 9-12h, system is placed in microwave reactor, the microwave 20-80min at 110-130 DEG C, then
Sample is put into 110~130 DEG C of baking ovens dry 9~12h again, calcining obtains final catalyst later.
5. high-dispersion Pd/Co (OH) as described in claim 12Catalyst, which is characterized in that in the catalyst, based on carrier
Quality, load capacity of the palladium compound in terms of palladium is 0.01-0.5wt%.
6. high-dispersion Pd/Co (OH) as described in claim 12Catalyst is applied in acetylene hydrogenation reaction.
7. application as claimed in claim 6, which is characterized in that the method for the application are as follows:
Selective hydrogenation of acetylene reaction before, first the catalyst is restored with hydrogen, reduction temperature be 130-230 DEG C,
Time is 1-4h；The catalyst after reduction is used for selective hydrogenation of acetylene reaction, reaction condition again are as follows: 60-210 DEG C of temperature,
Pressure 0.1-1MPa, air speed 1000-10000h-1；
In the selective hydrogenation of acetylene reaction, initial gas composition is reacted are as follows: 0.33%C2H2, 0.66%H2, 33.3%
C2H4, surplus N2。
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Cited By (2)
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| CN113231077A (en) * | 2021-05-12 | 2021-08-10 | 昆明理工大学 | Preparation method and application of defect-rich carrier interface reduction anchoring precious metal catalyst |
| CN115970709A (en) * | 2022-12-30 | 2023-04-18 | 厦门大学 | Pd-based catalyst, preparation method thereof and application thereof in aldehyde oxidation esterification reaction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231077A (en) * | 2021-05-12 | 2021-08-10 | 昆明理工大学 | Preparation method and application of defect-rich carrier interface reduction anchoring precious metal catalyst |
| CN115970709A (en) * | 2022-12-30 | 2023-04-18 | 厦门大学 | Pd-based catalyst, preparation method thereof and application thereof in aldehyde oxidation esterification reaction |
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