Novel modified Raney nickel catalyst, its preparation method and application

A technology of Raney nickel and catalyst, applied in the reaction of glucose hydrogenation to prepare sorbitol, the field of preparation of new modified Raney nickel catalyst material, can solve the problems of low catalytic efficiency, environmental pollution, etc., and achieve high activity, The effect of low cost and large active specific surface area

Inactive Publication Date: 2014-01-01
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method for preparing Raney nickel is to extract the prepared nickel-aluminum alloy with a certain concentration of alkali solution, then wash and remove the alkali to obtain porous Raney nickel particles, known as various Raney nickel particles of W1-W8. Nickel catalysts are mainly due to the difference in alloy addition conditions, alkali concentration, extraction time and temperature, and washing conditions, but the catalysts prepared in this way have the problems of low catalytic efficiency and serious environmental pollution.

Method used

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  • Novel modified Raney nickel catalyst, its preparation method and application
  • Novel modified Raney nickel catalyst, its preparation method and application
  • Novel modified Raney nickel catalyst, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Weigh a certain amount of Ni-Al alloy with a particle size of 80-100 mesh and a Ni content of about 40-50wt% at room temperature, and slowly add it to 6mol / L NaOH solution in an ice-water bath. The ratio of the number of milliliters is 1:10, and the temperature is stirred at 343K for 4 hours. The whole process is carried out under the protection of nitrogen to prevent oxidation of the sample, and a reflux device is used to prevent changes in the concentration of the NaOH solution. After the reaction, the supernatant was removed, and the black particles were repeatedly washed with deionized water to neutrality, and then washed with absolute ethanol to remove water, and stored in absolute ethanol; take 0.5g of Raney nickel particles at room temperature at 293 Place it in 10mL of deionized water at -298K, the ratio of the weight of Raney nickel in grams to the volume of water in milliliters is 1:20, slowly add 2mL of 0.1mol / L Na 2 MoO 4 Solution (containing Mo0.0192 gram)...

Embodiment 2

[0028] Adopt the same method as embodiment 1 to prepare novel Raney nickel catalyst, difference is, molybdate contains molybdenum gram number and ratio of Raney nickel weight gram number is 0.03, dropwise finishes and continues to stir 10min, ultrasonic probe power is 30W or 80W. Some structural parameters of the catalysts prepared under these conditions are listed in Table 3.

[0029] Table 3 Structural parameters of the new modified Raney nickel obtained under different ultrasonic treatment times

[0030]

[0031] The above catalyst is used to hydrogenate sorbitol from glucose, and the initial pressure of the hydrogenation reaction is P H2 =1.2MPa, the reaction temperature was controlled at 383K, and the reaction was carried out in a 200mL stainless steel autoclave. Initially, 0.5g of the new Raney nickel catalyst and 40mL of glucose solution (40%wt%) were added, and the reaction time was 2h. The results are shown in Table 4.

[0032] The glucose hydrogenation activity ...

Embodiment 3

[0036] Adopt the method identical with embodiment 1 to prepare framework nickel-phosphorus catalyst, difference is, molybdate contains molybdenum gram number and Raney nickel weight gram number ratio is 0.10, dropwise finishes and continues to stir 30min, and ultrasonic probe power is 30W or 80W. Some structural parameters of the catalysts prepared under these conditions are listed in Table 5.

[0037] Table 5 Structural parameters of the new modified Raney nickel obtained under different ultrasonic treatment times

[0038]

[0039] The above catalyst is used to hydrogenate sorbitol from glucose, and the initial pressure of the hydrogenation reaction is P H2 =1.2MPa, the reaction temperature was controlled at 383K, and the reaction was carried out in a 200mL stainless steel autoclave. Initially, 0.5g of the new Raney nickel catalyst and 40mL of glucose solution (40%wt%) were added, and the reaction time was 2h. The results are shown in Table 6.

[0040] The glucose hydrogen...

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Abstract

The invention discloses a novel modified Raney nickel catalyst, its preparation method and application. In the invention, an ultrasonic technology is applied in a process of dipping Raney nickel in a modifying agent. Substantive improvement is made to the modified Raney nickel technology, and the technology is essentially different from the ultrasonic cleaning after general catalyst preparation. The method involved in the invention has the advantages of simple process, low cost, and no adding of any environmental pollution. The prepared novel modified Raney nickel catalyst has greater active specific surface area, average pore size and pore volume compared with the Raney nickel that does not undergo ultrasonic treatment and the Raney nickel that undergoes molybdate dipping modification under the same conditions, and the content of oxide and impurities on the surface and in the catalyst itself is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a preparation method of a novel modified Raney nickel catalyst material and its application in the reaction of glucose hydrogenation to prepare sorbitol. Background technique [0002] Raney catalyst is a traditional reduction catalyst widely used in catalytic hydrogenation and dehalogenation reactions of olefins, aldehydes, ketones, nitro groups, nitrile groups and aromatic compounds, among which Raney nickel with metallic nickel as the active center It is the most widely used, accounting for more than 80% of all Raney metal catalysts, and the amount used in the important chemical reaction of glucose hydrogenation to sorbitol is as many as several thousand tons per year. The traditional method for preparing Raney nickel is to extract the prepared nickel-aluminum alloy with a certain concentration of alkali solution, then wash and remove the alkali to obtain porous Raney n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J25/02C07B31/00C07C31/26C07C29/141
Inventor 孟琦李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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