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A titanium dioxide-supported ruthenium catalyst for the selective hydrogenation of benzene to cyclohexene and its preparation method

A selectivity and catalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of agglomeration deactivation, large amount of precious metal Ru, etc.

Active Publication Date: 2021-04-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By simplifying the preparation process, regulating and optimizing the properties of the support, regulating the phase and texture properties of the titania support, the Ru nanoparticles in the catalyst are evenly distributed on the TiO 2 On the surface, the particle size of the active metal component Ru particles is controlled at about 4 nm, and the performance and stability of the catalyst are improved, which solves the problem of large amount of precious metal Ru used in traditional non-supported catalysts and is easy to agglomerate and deactivate. It is used for benzene selectivity The reaction of hydrogenation to cyclohexene has the advantages of high conversion rate and good selectivity of cyclohexene

Method used

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  • A titanium dioxide-supported ruthenium catalyst for the selective hydrogenation of benzene to cyclohexene and its preparation method
  • A titanium dioxide-supported ruthenium catalyst for the selective hydrogenation of benzene to cyclohexene and its preparation method

Examples

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Embodiment 1

[0026] Weigh 0.61 g RuCl 3 ·3H 2 O and made into a solution with a concentration of 0.40 mol / L, and then added 4.0 g of a three-neck round-bottomed flask that had been heat-treated at 680°C and had a specific surface area of ​​45 m2 / g, anatase TiO with a most probable pore diameter of 22 nm 2 Carrier, then Ru salt solution was added dropwise into a three-neck flask, and then 80 mL of deionized water was added to mix well, and mechanically stirred at a speed of 300 r / min for 3.5 h. Then weigh 0.32 g NaBH 4 And make a solution with a concentration of 0.4 mol / L, and then add it dropwise to the above mixed solution to fully react. After the reaction was complete, the agitation was stopped, and the black precipitate was taken out, then washed by centrifugation and dried in vacuum to obtain Ru / TiO with a Ru loading of 5 wt%. 2 catalyst.

Embodiment 2

[0028] Except that the carrier mentioned in Example 1 is replaced by one that has been heat-treated at 650°C, the specific surface area is 48 m 2 / g, anatase TiO with a most probable pore diameter of 21 nm 2 Except for the carrier, the rest of the synthesis details are consistent with Example 1.

Embodiment 3

[0030] Except that the carrier mentioned in Example 1 is replaced by one that has been heat-treated at 600°C, the specific surface area is 55 m 2 / g, anatase TiO with a most probable pore size of 18 nm 2 Except for the carrier, the rest of the synthesis details are consistent with Example 1.

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Abstract

The invention discloses a Ru / TiO used for the selective hydrogenation of benzene to cyclohexene 2 Catalyst and method for its preparation. Firstly, the precursor of active component Ru was introduced into TiO by impregnation method. 2 surface, then add reducing agent to fully react, centrifuge wash and dry to obtain Ru / TiO 2 catalyst. The outstanding advantages of the catalyst prepared by the present invention are: the preparation steps are simple, and the Ru nanoparticles in the catalyst are evenly distributed on the TiO by regulating the phase and texture properties of the titanium dioxide carrier. 2 On the surface, the Ru particle size is controlled at about 4 nm, and it is used in the selective hydrogenation of benzene to cyclohexene, which has the advantages of high conversion rate and good cyclohexene selectivity.

Description

technical field [0001] The invention relates to a catalyst for catalyzing the selective hydrogenation of benzene to prepare cyclohexene and a preparation method thereof, belonging to the field of novel catalysts and the preparation thereof. Background technique [0002] Cyclohexene is an important organic intermediate, which is widely used in the production of adipic acid, nylon-6, nylon-66, polyamide and other fine chemicals, and has huge industrial economic value and broad market prospects. The route of selective hydrogenation of benzene to cyclohexene and then to nylon-6 and nylon-66 has attracted wide attention because of its advantages of sufficient raw materials, high economic benefits, environmental friendliness and production safety. However, from a thermodynamic point of view, since the standard Gibbs free energy of the selective hydrogenation of benzene to cyclohexene becomes -23 kJ / mol, the complete hydrogenation of benzene to cyclohexane is -98 kJ / mol. The hydro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J37/02B01J37/16B01J35/10C07C5/11C07C13/20
CPCY02P20/52
Inventor 詹瑛瑛周创金凡陈崇启江莉龙
Owner FUZHOU UNIV
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