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Ru-Co nanocatalyst and application of Ru-Co nanocatalyst in selective hydrogenation reaction of benzaldehyde compound

A compound, cobalt nanotechnology, applied in the ruthenium-cobalt nanocatalyst and its application in the selective hydrogenation reaction of benzaldehyde compounds, can solve the problems of troublesome preparation process of carbon nanotubes, difficulty in large-scale preparation and production, and achieve convenient reduction , easy to industrial production, good selectivity effect

Inactive Publication Date: 2015-04-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst obtained a good result of vanillyl alcohol selectivity, but the preparation process of carbon nanotubes is troublesome, and it is not easy to prepare and produce on a large scale. Therefore, it is very necessary to prepare a hydrogenation catalyst with high selectivity and has industrial application value.

Method used

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  • Ru-Co nanocatalyst and application of Ru-Co nanocatalyst in selective hydrogenation reaction of benzaldehyde compound
  • Ru-Co nanocatalyst and application of Ru-Co nanocatalyst in selective hydrogenation reaction of benzaldehyde compound
  • Ru-Co nanocatalyst and application of Ru-Co nanocatalyst in selective hydrogenation reaction of benzaldehyde compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing 0.027g ruthenium (III) chloride hydrate (ruthenium content 37%) in the round bottom flask, 20mL water is used as solvent, then add 1.05g cobalt nitrate, after all dissolving, slowly add 0.7g gac (noble metal ruthenium compound (calculated as Ru), the metal cobalt compound (calculated as Co) and the mass ratio of activated carbon is 1:21.3:70.1). After stirring for 3 hours, sodium hydroxide solution was added dropwise to make the pH = 11. After stirring for 12 hours, the solvent was filtered and washed with distilled water until pH = 7. The obtained supported pre-catalyst was vacuum-dried at 60° C. for 12 hours. The dried pre-catalyst was placed in a tube furnace and reduced under hydrogen at 300°C for 4h (heating rate 5°C / min). After naturally cooling down to room temperature, catalyst C1 was obtained.

Embodiment 2

[0021] Weigh 0.004g ruthenium (III) chloride hydrate (37% ruthenium content) in the round bottom flask, 20mL water is used as solvent, then add 0.525g cobalt nitrate, after all dissolving, slowly add 0.7g gac (noble metal ruthenium compound (calculated as Ru), the mass ratio of metal cobalt compound (calculated as Co) and activated carbon is 1:72.0:473.0). After stirring for 4 hours, potassium hydroxide solution was added dropwise to make the pH = 10. After stirring for 6 hours, the solvent was filtered and washed with distilled water until pH = 7.5. The obtained supported pre-catalyst was vacuum-dried at 40° C. for 12 hours. The dried pre-catalyst was placed in a tube furnace and reduced under hydrogen at 200°C for 4h (heating rate 8°C / min). After naturally cooling down to room temperature, catalyst C2 was obtained.

Embodiment 3

[0023] Take by weighing 0.027g ruthenium (III) chloride hydrate (ruthenium content 37%) in the round bottom flask, 20mL water is used as solvent, then add 1.75g ​​cobalt nitrate, after all dissolving, slowly add 3.5g gac (noble metal ruthenium compound (calculated as Ru), the mass ratio of metal cobalt compound (calculated as Co) and activated carbon is 1:35.4:350.4). After stirring for 4 hours, sodium hydroxide solution was added dropwise to make the pH = 9. After stirring for 8 hours, the solvent was filtered and washed with distilled water until pH = 7. The obtained supported pre-catalyst was vacuum-dried at 80° C. for 12 hours. The dried pre-catalyst was placed in a tube furnace and reduced under hydrogen at 300°C for 4h (heating rate 5°C / min). After naturally cooling down to room temperature, catalyst C3 was obtained.

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Abstract

The invention relates to an active carbon loaded Ru-Co nanocatalyst and its application in a selective hydrogenation reaction of a benzaldehyde compound. The Ru-Co nanocatalyst is characterized in that a metallic ruthenium compound and a metallic cobalt compound undergo coprecipitation on an active carbon carrier and then reduction is carried out under a hydrogen atmosphere so as to obtain the Ru-Co nanocatalyst, wherein mass ratio of ruthenium to cobalt to active carbon in the prepared active carbon loaded Ru-Co nanocatalyst is 1: (10-100): (50-500). According to the selective benzaldehyde compound hydrogenation reaction catalyzed by the Ru-Co nanocatalyst, the benzaldehyde compound is converted to obtain corresponding benzyl alcohol. A preparation method of the catalyst is simple; raw materials are cheap and easily available; and the Ru-Co nanocatalyst is suitable for industrial production. In addition, the catalyst shows good activity and selectivity for the hydrogenation reaction of the benzaldehyde compound, and the catalyst is easy to recycle and reuse.

Description

technical field [0001] The invention relates to a catalyst and its application, in particular to a ruthenium-cobalt nanometer catalyst and its application in the selective hydrogenation reaction of benzaldehyde compounds. Background technique [0002] Vanillyl alcohol is an important pharmaceutical intermediate and a raw material for synthesizing some drugs (for example: vanillyl butyl ether, vanillyl alcohol isopropyl ether, etc.), and has a high industrial application prospect. At present, most of its sources are extracted from Gastrodia elata, and some are obtained through the reduction of vanillin. However, from the perspective of the disclosed technical route of vanillin reduction to obtain vanillyl alcohol, the main reducing agent used is still a metal hydride, such as: NaBH 4 (Green Chem.14, 2012, 2289-2293), Zn(BH 4 ) 2 (J.Mex.Chem.Soc.56, 2012, 169-175) and NaBH 3 CN (B. Kor. Chem. Soc. 31, 2010, 2961-2966) and so on. Due to the high price of metal hydrides, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C41/26C07C43/23
CPCY02P20/584
Inventor 黄军汪志
Owner NANJING UNIV OF TECH
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