CN109999893A - A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst - Google Patents
A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst Download PDFInfo
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- CN109999893A CN109999893A CN201910264712.7A CN201910264712A CN109999893A CN 109999893 A CN109999893 A CN 109999893A CN 201910264712 A CN201910264712 A CN 201910264712A CN 109999893 A CN109999893 A CN 109999893A
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- B01J29/00—Catalysts comprising molecular sieves
- B01J29/03—Catalysts comprising molecular sieves not having base-exchange properties
- B01J29/0308—Mesoporous materials not having base exchange properties, e.g. Si-MCM-41
- B01J29/0316—Mesoporous materials not having base exchange properties, e.g. Si-MCM-41 containing iron group metals, noble metals or copper
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- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/041—Mesoporous materials having base exchange properties, e.g. Si/Al-MCM-41
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- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
- B01J29/10—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
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- B01J29/00—Catalysts comprising molecular sieves
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- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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- 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
- C07C5/10—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by hydrogenation of aromatic six-membered rings
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- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/14—The ring being saturated
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Abstract
The invention belongs to prepared from benzene and hydrogen cyclohexyl benzene catalyst technical fields, disclose a kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst.Template in S1, removing molecular sieve；The molecular sieve is H beta-molecular sieve, HY molecular sieve or HMCM-41 molecular sieve；The load of S2, active component: palladium acetate is added in anhydrous methanol by S2.1, at room temperature while stirring, persistently stirs 5 ~ 15 min after palladium acetate is added；S2.2, molecular sieve obtained by step S1 is added in stirring liquid obtained by step S2.1, continues 30 ~ 45 min of stirring；S3, suspension obtained by step S2 is centrifuged, washing and depositing object, until neutral；It is final catalyst after S4, the sediment drying at room temperature washed, grinding.Catalyst of the present invention is reducing agent due to using Pd as active constituent, anhydrous methanol, improves the yield of product cyclohexyl benzene, and the yield of cyclohexyl benzene achieves preferable technical effect up to 32.8%.
Description
Technical field
The invention belongs to prepared from benzene and hydrogen cyclohexyl benzene catalyst technical fields, and in particular to a kind of prepared from benzene and hydrogen cyclohexyl
The preparation method of benzene catalyst.
Background technique
Cyclohexyl benzene can make high boiling solvent with 240.12 DEG C of higher boiling as a kind of important industrial chemicals, or
As liquid crystal material intermediate, it is also possible to make the additive of lithium battery secondary cell organic electrolyte.In addition, passing through cyclohexyl benzene
Hydroperoxidation reaction can prepare phenol and cyclohexanone, phenol product is a kind of essential industry chemistry with numerous applications
Product, it is also the starting material of several staple products such as novolak resin, caprolactam and alkyl phenol.
The preparation method of cyclohexyl benzene: benzene and cyclohexene alkylation process, biphenyl hydrogenation method, benzene direct hydrogenation alkylation process.
Preceding two lines yield is high, but is limited by raw material sources, and large-scale industrial production is not suitable for.The alkylation of benzene direct hydrogenation
Legal system cyclohexyl benzene has many advantages, such as that benzene feedstock abundance, simple process, at low cost, production process is environmentally friendly is suitble to extensive work
Industry metaplasia produces.But it is domestic at present research and produce in catalyst used in the process route performance it is not ideal enough, cause
The problems such as selectivity is lower and cyclohexyl benzene yield is lower.
At present both at home and abroad focus mostly on the catalyst research of prepared from benzene and hydrogen cyclohexyl benzene in double function of Metal Supported molecular sieve
In the preparation of energy catalyst, expand to a series of researchs such as mode of loading, metal species, molecular sieve type, hydroconversion conditions.
The problem of capturing mainly is needed to have Metal Supported is uneven, hydrogen reduction high temperature is reunited to lead to metal in the field at present
A series of problems, such as grain is excessive, to the controls of hydrogenation conditions, it would be highly desirable to study a kind of method to solve above-mentioned described ask
Topic.
Summary of the invention
The purpose of the present invention is intended to provide a kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst, steps are as follows:
Template in S1, removing molecular sieve；The molecular sieve is H beta-molecular sieve, HY molecular sieve or HMCM-41 molecular sieve；
The load of S2, active component:
Palladium acetate, is added in anhydrous methanol by S2.1, at room temperature while stirring, persistently stirs 5 ~ 15 after palladium acetate is added
min；
S2.2, molecular sieve obtained by step S1 is added in stirring liquid obtained by step S2.1, continues 30 ~ 45 min of stirring；
In terms of mass volume ratio, palladium acetate: molecular sieve obtained by step S1: anhydrous methanol=(0.0063 ~ 0.0317) g: 1 g: 8 ~ 40
mL；
S3, suspension obtained by step S2 is centrifuged, washing and depositing object, until neutral；
It is final catalyst after S4, the sediment drying at room temperature washed, grinding.
Preferably, in step S1, by molecular sieve in 500 ~ 550 DEG C of 4 ~ 6 h of roasting, the template in molecular sieve is removed.
Preferably, in step S1, the H beta-molecular sieve is the H beta-molecular sieve that silica alumina ratio is 30 ~ 300.
Preferably, it in step S3, is first washed twice with water, again with methanol washed once.
Methanol not only can be as the solvent of dissolution presoma in the present invention, but also can work as reducing agent；Catalyst is due to using
Pd is active constituent, anhydrous methanol is reducing agent, improves the yield of product cyclohexyl benzene, in 200 DEG C of reaction temperature, benzene
Under conditions of pressing 4.0 Mpa than 44, hydrogen with catalyst quality, react 80 min of duration, the yield of cyclohexyl benzene up to 32.8%,
Achieve preferable technical effect.
Detailed description of the invention
Fig. 1: the TEM figure of embodiment 1 and the catalyst of reference examples 1-2 preparation :(a)-(b) is the TEM of embodiment 1,
(c) it is the TEM of reference examples 1, (d) is the TEM of reference examples 2.
Specific embodiment
Technical solution of the present invention is further discussed in detail with reference to embodiments, but protection scope of the present invention
It is not limited thereto.
Embodiment 1
Determine that content of metal is 0.9 wt%, the i.e. corresponding 0.009 g Pd of 1 g molecular sieve, according to Pd content 47.3 in palladium acetate
% show that corresponding palladium acetate quality is 0.01903 g.
A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst, steps are as follows:
S1, the template by the H beta-molecular sieve of silica alumina ratio 30 in 500 DEG C of 6 h of roasting, removing molecular sieve；
The load of S2, active component:
S2.1,25 mL anhydrous methanols are poured into beaker, water-bath controls 25 DEG C of room temperature, is slowly added in whipping process
0.01903g palladium acetate continues to stir 5 min；
S2.2, H beta-molecular sieve obtained by 1 g step S1 is added in stirring liquid obtained by step S2.1, continues to stir 30 min；
S3, it suspension obtained by step S2 is moved in centrifuge tube is centrifuged, remove supernatant, sediment first uses secondary water (to pass through
Second of distilled water) it washes twice, again with methanol washed once；
S4, the sediment washed are placed in drying in 30 DEG C of vacuum oven, are final catalyst after grinding.
Embodiment 2
Difference from example 1 is that: the silica alumina ratio of the H beta-molecular sieve is 50, other with embodiment 1.
Embodiment 3
Difference from example 1 is that: the silica alumina ratio of the H beta-molecular sieve is 80, other with embodiment 1.
Embodiment 4
Difference from example 1 is that: the silica alumina ratio of the H beta-molecular sieve is 150, other with embodiment 1.
Embodiment 5
Difference from example 1 is that: the silica alumina ratio of the H beta-molecular sieve is 300, other with embodiment 1.
Reference examples 1-- tradition incipient impregnation method
Determine that content of metal is 0.9 wt%, i.e. the corresponding 0.009 g Pd of 1 g molecular sieve is hydrated according to four ammino palladium chlorides one
40.4 % of Pd content in object show that the corresponding four amminos palladium chloride monohydrate quality of 1g molecular sieve is 0.0223 g.
A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst, steps are as follows:
S1, pretreatment
S1.1, the template by the H beta-molecular sieve of silica alumina ratio 30 in 500 DEG C of 6 h of roasting, removing molecular sieve；
S1.2, it surveys water absorption: taking H beta-molecular sieve obtained by 1 g step S1.1, constantly instillation secondary water is just saturated wet to molecular sieve
The state of profit determines that the corresponding water absorption of 1 g H beta-molecular sieve is 1 mL；
S1.3, by 0.0223 g Pd (NH3)4Cl2·H2O is put into 1 mL secondary water, prepares precursor salt solution；
The load of S2, active component:
S2.1, H beta-molecular sieve obtained by 1 g step S1.1 is added in crucible；
S2.2, the 0.1 resulting precursor salt solution of mL step S1.3 is drawn with liquid-transfering gun, be slowly dropped into crucible, glass bar stirs
It mixes, is put on oscillator and vibrates, so that precursor salt solution is uniformly dispersed in molecular sieve；
S2.3, S2.2 step is repeated, until the resulting 1 mL precursor salt solution of step S1.3 drips off, by repeatedly stirring and shaking
It swings, makes precursor salt solution uniform load over a molecular sieve；
S3, the sample loaded is placed in in 60 DEG C of vacuum oven dry, grinding；
S4, powder obtained by step S3 is placed in tube furnace, in 315 DEG C, nitrogen and hydrogen mixture (nitrogen and hydrogen, volume ratio 9: 1)
Reductase 12 h is under atmosphere to get final catalyst.
Reference examples 2--NaBH4Strong reductant chemical reduction method
Determine that content of metal is 0.9 wt%, the i.e. corresponding 0.01062 g Pd of 1.18 g molecular sieves, according to four ammino palladium chlorides one
40.4 % of Pd content in hydrate show that the corresponding four amminos palladium chloride monohydrate quality of 1.18 g molecular sieves is 0.0263
g。
A kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst, steps are as follows:
S1, pretreatment
S1.1, the template by the H beta-molecular sieve of silica alumina ratio 30 in 500 DEG C of 6 h of roasting, removing molecular sieve；
S1.2, the Pd (NH by 0.0263 g3)4Cl2·H2O is put into 20 mL secondary waters, is made into the forerunner of 0.005 mol/L
Body salting liquid, it is spare；
The load of S2, active component
S2.1,4.5 mg PVP(strong reductants are direct plungeed into solution, metal coking can be made very serious, so using
PVP works as stabilizer) it is added in the precursor salt solution that 20 mL S1.2 are prepared, 0.5 h is stirred at 0 DEG C, is then added 200
The NaBH of 0.1 mol/L of μ l4Aqueous solution；
PH is adjusted to 10 by S2.2, the NaOH aqueous solution for being gradually dropped 0.1 mol/L under stiring；
S2.3, H beta-molecular sieve obtained by 1.18 g step S1.1 is added into mixed solution, stirs 45min；
S3, it suspension obtained by step S2.3 is moved in centrifuge tube is centrifuged, remove supernatant, the secondary water washing three of sediment
It is secondary；
S4, the sediment washed are placed in drying in 30 DEG C of vacuum oven, are final catalyst after grinding.
Product structure characterization
The TEM figure of embodiment 1 and reference examples 1-2 gained catalyst is shown in Fig. 1, it is known that: metal in catalyst prepared by embodiment 1
Particle is smaller and dispersion is obvious very uniformly；Metallic particles is larger in catalyst prepared by reference examples 1, bad dispersibility, reference examples 2
Although metallic particles dispersibility is preferably in the catalyst of preparation but size is uneven.
Activity rating
50 mL benzene and 1 g catalyst are put into 300 mL autoclaves, in 850 r/min of stirring rate, 200 DEG C, hydrogen
It presses and continuously stirs 80 min of reaction under the conditions of 4 Mpa.It is formed using chromatographic product, fid detector, by peak area
Than the relative amount that correction calculates hexamethylene, cyclohexyl benzene and benzene, the selection of the conversion ratio, cyclohexyl benzene of different moments benzene is calculated
Property and yield.
The reactivity data of catalyst are shown in Table 1.As shown in Table 1: the data result of embodiment 1 and reference examples 1-2 shows,
Under conditions of identical silica alumina ratio and load capacity, the method for the present invention and traditional incipient impregnation method, strong reductant restoring method
Compare, either from the selectivity of benzene conversion ratio or cyclohexyl benzene, performance all it is good very much；The data of embodiment 1-5
It, can be with the results show that downward trend is all presented in the conversion ratio of benzene and the selectivity of cyclohexyl benzene with the increase of silica alumina ratio
Show that acid intensity plays an important role in the reaction, and acid smaller, performance is poorer.
Claims (4)
1. a kind of preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst, which is characterized in that steps are as follows:
Template in S1, removing molecular sieve；The molecular sieve is H beta-molecular sieve, HY molecular sieve or HMCM-41 molecular sieve；
The load of S2, active component:
Palladium acetate, is added in anhydrous methanol by S2.1, at room temperature while stirring, persistently stirs 5 ~ 15 after palladium acetate is added
min；
S2.2, molecular sieve obtained by step S1 is added in stirring liquid obtained by step S2.1, continues 30 ~ 45 min of stirring；
In terms of mass volume ratio, palladium acetate: molecular sieve obtained by step S1: anhydrous methanol=(0.0063 ~ 0.0317) g: 1 g: 8 ~ 40
mL；
S3, suspension obtained by step S2 is centrifuged, washing and depositing object, until neutral；
It is final catalyst after S4, the sediment drying at room temperature washed, grinding.
2. the preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst as described in claim 1, it is characterised in that: step S1
In, by molecular sieve in 500 ~ 550 DEG C of 4 ~ 6 h of roasting, remove the template in molecular sieve.
3. the preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst as described in claim 1, it is characterised in that: step S1
In, the H beta-molecular sieve is the H beta-molecular sieve that silica alumina ratio is 30 ~ 300.
4. the preparation method of prepared from benzene and hydrogen cyclohexyl benzene catalyst as described in claim 1, it is characterised in that: step S3
In, it is first washed twice with water, again with methanol washed once.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559922A (en) * | 2021-08-13 | 2021-10-29 | 郑州大学 | Bimetallic catalyst for preparing cyclohexylbenzene by benzene hydrogenation and preparation method and application thereof |
| CN113663722A (en) * | 2021-09-01 | 2021-11-19 | 郑州大学 | Catalyst for preparing cyclohexylbenzene by benzene hydroalkylation and preparation method and application thereof |
| WO2023072041A1 (en) * | 2021-10-26 | 2023-05-04 | 中国石油化工股份有限公司 | Hydrogenation-acid catalysis bifunctional catalyst, and preparation method therefor and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113559922A (en) * | 2021-08-13 | 2021-10-29 | 郑州大学 | Bimetallic catalyst for preparing cyclohexylbenzene by benzene hydrogenation and preparation method and application thereof |
| CN113663722A (en) * | 2021-09-01 | 2021-11-19 | 郑州大学 | Catalyst for preparing cyclohexylbenzene by benzene hydroalkylation and preparation method and application thereof |
| WO2023072041A1 (en) * | 2021-10-26 | 2023-05-04 | 中国石油化工股份有限公司 | Hydrogenation-acid catalysis bifunctional catalyst, and preparation method therefor and application thereof |
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Application publication date: 20190712 |