Application of three-dimensional ordered macroporous carbon nitride supported palladium catalyst in catalytic hydrogenation of styrene unsaturated copolymers

A three-dimensional ordered, porous carbon nitride technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effect of not easy to agglomerate, high specific surface area, and strong binding force

Inactive Publication Date: 2020-05-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there is no three-dimensional ordered macroporous carbon nitride (3DOM g-C 3 N 4 ) as a carrier used in the hydrogenation reaction of polymer macromolecules

Method used

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  • Application of three-dimensional ordered macroporous carbon nitride supported palladium catalyst in catalytic hydrogenation of styrene unsaturated copolymers
  • Application of three-dimensional ordered macroporous carbon nitride supported palladium catalyst in catalytic hydrogenation of styrene unsaturated copolymers
  • Application of three-dimensional ordered macroporous carbon nitride supported palladium catalyst in catalytic hydrogenation of styrene unsaturated copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Disperse 10 mL tetraethyl orthosilicate (TEOS) in 50 mL ethanol to obtain solution A; mix 50 mL ethanol, 20 mL deionized water and 10 mL 25-28wt% ammonia solution and stir evenly, and control the stirring speed was 1100 rpm to obtain solution B; quickly added solution A to solution B in a water bath at 40 °C, kept stirring at 1100 rpm for 1 min, then reduced the rotation speed to 600 rpm, and continued the reaction for 2.5 h to obtain uniformly dispersed core SiO 2 Mixed solution of solids; add the mixed solution containing 1 mL TEOS, 5 mL ethanol and 0.2 g PVP dropwise to the above solution under vigorous stirring, continue to stir the reaction at 40 °C for 2 h, and then stand overnight at room temperature , the white solid obtained after centrifugation was washed with deionized water and ethanol, dried in a vacuum oven at 60 °C for 12 h, then transferred to a crucible, and calcined in a muffle furnace at 700 °C for 6 h to obtain a three-dimensional ordered mesoporous ...

Embodiment 2

[0044] The catalyst synthesis steps are the same as in Example 1. Dissolve 2 g of SBS in 80 g of cyclohexane and add 1 g of catalyst Pd / 3DOM g-C 3 N 4 , Catalytic hydrogenation reaction is carried out in the autoclave. The reaction conditions are: temperature 140 °C, hydrogen pressure 3.0 MPa, reaction time 6.0 h. After the reaction, centrifuge, add ethanol coagulation to the glue solution to obtain the product SEBS, and the degree of hydrogenation is listed in Table 1.

Embodiment 3

[0046] The catalyst synthesis steps are the same as in Example 1. Dissolve 3 g of SBS in 80 g of cyclohexane and add 1 g of catalyst Pd / 3DOM g-C 3 N 4 , Catalytic hydrogenation reaction is carried out in the autoclave. The reaction conditions are: temperature 140 °C, hydrogen pressure 3.0 MPa, reaction time 6.0 h. After the reaction, centrifuge, add ethanol coagulation to the glue solution to obtain the product SEBS, and the degree of hydrogenation is listed in Table 1.

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Abstract

The invention discloses application of a three-dimensional ordered macroporous carbon nitride supported palladium catalyst in catalytic hydrogenation of styrene unsaturated copolymers. The preparationmethod comprises the following steps: by taking a three-dimensional ordered mesoporous core-shell structured SiO2 nanosphere as a template and cyanamide as a precursor, three-dimensional ordered macroporous carbon nitride (3DOM g-C3N4) is prepared through a thermal condensation assisted colloidal crystal template method; afterwards, the compound is used as a carrier to prepare a Pd/3DOM g-C3N4 supported catalyst through a chemical reduction method. The obtained catalyst has a three-dimensional porous structure which is orderly arranged; the macroporous cavity is spherical; the defect of diffusion limitation of polymer macromolecules in micropores and mesoporous channels can be overcome; when the catalyst is applied to a heterogeneous catalytic hydrogenation reaction of styrene unsaturatedcopolymers SBR and SBS, a hydrogenated product with high quality and high hydrogenation degree can be obtained, so that the catalyst has important significance for development of heterogeneous catalytic hydrogenation of styrene unsaturated copolymers.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and the field of heterogeneous hydrogenation of styrene unsaturated polymers, and specifically relates to the three-dimensional ordered macroporous supported catalyst in the heterogeneous catalytic hydrogenation of styrene unsaturated copolymers SBR and SBS application. Background technique [0002] Styrenic unsaturated copolymers such as SBS (styrene-butadiene-styrene block copolymer) and SBR (styrene-butadiene rubber), due to the existence of unsaturated double bonds, have very active chemical properties and are resistant to oxygen, ozone and The poor resistance to ultraviolet light degradation limits its performance to a certain extent, and the common method of modification is hydrogenation. [0003] SEBS and HSBR are currently widely used hydrogenation products. SEBS is a saturated type of SBS, or hydrogenated SBS, which is prepared by selectively catalytically hydrogenating unsaturated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J35/10B82Y30/00B82Y40/00C08F8/04C08F297/04C08F236/10
CPCB01J27/24B01J35/1014B01J37/0009B82Y30/00B82Y40/00C08F8/04C08F297/04C08F236/10
Inventor 袁珮郭艳鲍晓军张宏伟岳源源朱海波
Owner FUZHOU UNIV
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