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Titanium dioxide supported ruthenium catalyst for preparing cyclohexene through benzene selective hydrogenation and preparation method of titanium dioxide supported ruthenium catalyst

A selective, catalyst technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. The effect of saving catalyst cost, promoting desorption, and shortening the process

Active Publication Date: 2019-06-14
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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  • Titanium dioxide supported ruthenium catalyst for preparing cyclohexene through benzene selective hydrogenation and preparation method of titanium dioxide supported ruthenium catalyst
  • Titanium dioxide supported ruthenium catalyst for preparing cyclohexene through benzene selective hydrogenation and preparation method of titanium dioxide supported ruthenium catalyst

Examples

Experimental program
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Effect test

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 the three-necked round-bottomed flask after heat treatment at 680 °C, with a specific surface area of ​​45 m2 / g, most likely anatase TiO with a pore size of 22 nm 2 Then, the Ru salt solution was added dropwise into the three-necked flask, and then 80 mL of deionized water was added to mix evenly, and the mixture was mechanically stirred at a speed of 300 r / min for 3.5 h. Then weigh 0.32 g NaBH 4 And made into a solution with a concentration of 0.4 mol / L, and then added dropwise to the above mixed solution to fully react. After the reaction was completed, the stirring was stopped, and the black precipitate was taken out, followed by centrifugal washing and vacuum drying to obtain Ru / TiO with a Ru loading of 5 wt%. 2 catalyst.

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention discloses a Ru / TiO2 catalyst for preparing cyclohexene through benzene selective hydrogenation and a preparation method of the Ru / TiO2 catalyst. The preparation method comprises the steps that firstly, a precursor of an active component Ru is introduced to the surface of TiO2 through an impregnation method, then a reducing agent is added for full reacting, centrifugal washing and drying are conducted, and thus the Ru / TiO2 catalyst is prepared. The prepared Ru / TiO2 catalyst has the outstanding advantages that the preparation steps are simple, by regulating and controlling the phase and the texture property of a TiO2 carrier, Ru nano particles in the catalyst are evenly distributed on the surface of the TiO2, the Ru particle size is controlled to be about 4 nm, and the Ru / TiO2catalyst is used for a reaction for cyclohexene preparation through selective hydrogenation and 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 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, with huge industrial economic value and broad market prospects. The route of selectively hydrogenating benzene to cyclohexene and then preparing nylon-6 and nylon-66 has attracted wide attention due to its advantages of abundant raw materials, high economic benefits, environmental friendliness and production safety. However, from a thermodynamic point of view, since the standard Gibbs free energy of selective hydrogenation of benzene to cyclohexene becomes -23 kJ / mol, and the complete hydrogenation of benzene to cyclohexane is -98 kJ / mol, thermodynamic ana...

Claims

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Application Information

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Patent Type & Authority Applications(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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