Benzene selective hydrogenation carried ruthenium based catalyst and its preparation

A technology for selective hydrogenation and ruthenium catalyst, applied in the chemical industry, can solve the problems of increasing the difficulty of industrial operation, energy consumption, unsuitability and other problems

Inactive Publication Date: 2003-06-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of general supported ruthenium-based catalysts often requires long-term roasting and high-temperature reduction processes, which inevitably increases the difficulty and energy consumption of industrial operations.
At the same time, existing experimental studies have confirmed that hydrophobic substances are not suitable for carriers, while hydrophilic carriers are good carrier materials.

Method used

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  • Benzene selective hydrogenation carried ruthenium based catalyst and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0017] Put 40mL of 2.0mol / L ZrOCl 2 The solution and 40mL of 3.0mol / L ammonia were added dropwise to RuCl at 50℃ with constant temperature stirring. 3 In solution (containing Ru1.6×10 -4 g / mL), the dropping rate is 1.0ml / min. After the addition is complete, continue to stir at constant temperature for 40 minutes, leave it at room temperature overnight, and centrifuge to wash it until there is no chloride ion. The reduction treatment of the catalyst is carried out in an autoclave. The washed catalyst, 100mL water, 4.0g ZnSO 4 ·7H 2 O was put into a 500 mL autoclave and replaced with hydrogen 3 times to remove the air in the autoclave. The reduction treatment conditions are as follows: the hydrogen pressure is 4.28MPa, the stirring speed is 1000r / min, the reduction temperature is 180°C, and the reduction time is 40min. Example 2: Ru-Zn / ZrO 2 ·XH 2 Preparation of O catalyst

[0018] ZrOCl 2 The solution and ammonia are added dropwise to RuCl with constant temperature stirring at 50℃ ...

Embodiment 3

[0020] Slowly drop a sufficient amount of ammonia (6M) into an appropriate amount of RuCl stirred at a constant temperature of 50°C 3 In the mixed solution with aluminum nitrate, the pH of the final mixed solution is 9.2. After the addition is completed, continue to stir and hydrolyze for 40 minutes.

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Abstract

A Ru-base catalyst for selective hydrogenation of benzene to prepare cyclohexene is prepared from Ru, carrier (metal oxide), modifier M chosen from Cr, Mo, W, Fe, Co, Cu and La, and salt solution N through introducing hydrogen gas to aqueous solution to reduce Ru(OH)3 and M, and centrifugal washing to remove impurity ions. Its advantages are high activity and selectivity, and easy storage.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry, and is a novel catalyst used for selective hydrogenation of benzene to produce cyclohexene and a preparation method thereof. Background technique [0002] Cyclohexene is an important organic synthesis intermediate, which can be widely used in the production of medicines, pesticides, agrochemicals, feed additives, polyesters and other fine chemicals. In particular, cyclohexanone and adipic acid, the deep-processed products of cyclohexene, are intermediates widely used in the synthesis of polyamide fibers. The traditional methods for producing cyclohexene, such as cyclohexanol dehydration, halogenated cyclohexane dehydrohalogenation and Birch reduction, have the disadvantages of complex production process and high cost, so that cyclohexene is only used for lysine High value-added fine chemical products such as cyclohexene oxide, etc., cannot be used in the production of cyclohexanol, adipic ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/56B01J23/89B01J37/03C07C5/11C07C13/20
CPCY02P20/52Y02P20/582
Inventor 乔明华王建强范康年
Owner FUDAN UNIV
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