Preparation method and application of carbon-coated nano copper-zinc-aluminum catalyst

A catalyst and nano-copper technology, applied in the field of catalysis, can solve the problems of loss of active components, low mechanical strength, long processing time, etc., to reduce the side reactions of esterification and etherification, improve selectivity and stability, and reduce catalyst activity. high effect

Inactive Publication Date: 2018-12-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The catalyst disclosed in CN104258869A is copper-zinc-aluminum-tin-alkaline earth metal, its hydrogenation reaction temperature is 120-140°C, and the reaction pressure is 3-5MPa, the catalyst reduction is reduction in the mixed gas of nitrogen and hydrogen, but hydrogenation The space velocity of the reaction is low
CN1294570A discloses a kind of copper base catalyst, with TiO 2 It is an inorganic carrier, used for catalytic hydrogenation of carboxyl compounds, and its tableting is at 300-600 ° C, which consumes a lot of energy and takes a long time to process
However, the synthesis of hydroxypivalaldehyde takes formaldehyde and isobutyraldehyde as raw materials at present, and organic amines (trimethylamine or triethylamine are catalysts) are used as catalysts. The active component copper and organic amines form complexes that cause the activity of hydrogenation catalysts. The main reason for the loss of components
Copper-based catalysts prepared by traditional precipitation methods have low mechanical strength, easy loss of active components, and low dispersion.
Therefore, traditional copper-based catalysts have problems such as easy deactivation and rapid decline in activity.
[0008] To sum up, the market prospect of neopentyl glycol is broad, and the supply of neopentyl glycol in China exceeds the demand, and the sodium formate method is basically used in China to prepare neopentyl glycol. Under the influence of hydrogen catalyst, the condensation hydrogenation route develops slowly

Method used

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  • Preparation method and application of carbon-coated nano copper-zinc-aluminum catalyst
  • Preparation method and application of carbon-coated nano copper-zinc-aluminum catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Catalyst preparation:

[0043] (1) Mix copper nitrate, zinc nitrate, and aluminum nitrate in a molar ratio of 1:1:0.5, then add acetylene carbon black by 25wt% of the total mass of the metal compound, and then ethanol by mass ratio: (carbon-based material+metal compound )=5:1 adding ethanol, stirring and mixing for 24h to obtain a slurry;

[0044] (2) heating the slurry obtained in step (1) to 80° C. and stirring for 1 h, evaporating ethanol until the mixture becomes a paste, and then drying at 70° C. for 24 h to obtain a carbon-coated nano-copper-zinc-aluminum catalyst precursor;

[0045] (3) Carbonize 40g of the precursor obtained in step (2) under the protection of nitrogen at a rate of 50ml / min, raise the temperature to 400°C at a rate of 5°C / min, and keep the temperature constant for 4 hours, and then take it out after the temperature naturally drops below 80°C. Obtain carbonized compound;

[0046] (4) Mix the carbonized compound in step (3) with concentrated hyd...

Embodiment 2

[0052] Catalyst preparation:

[0053] (1) Mix copper nitrate, zinc nitrate, and aluminum nitrate in a molar ratio of 2:1:0.5, then add 25wt% of the total mass of the metal compound and add acetylene carbon black, then ethanol by mass ratio: (carbon-based material+metal compound )=5:1 adding ethanol, stirring and mixing for 24h to obtain a slurry;

[0054] (2) Heat the slurry obtained in step (1) to 80° C. and stir for 1 h, evaporate the ethanol in step (1) until the mixture becomes a paste, and dry at 70° C. for 24 h to obtain carbon-coated nano-copper zinc-aluminum catalyst. Precursor;

[0055] (3) Carbonize 40g of the mixture in step (2) under the protection of nitrogen at a rate of 50ml / min, raise the temperature to 400°C at a rate of 5°C / min, and keep the temperature constant for 4h, then take it out after the temperature naturally drops below 80°C to obtain carbonization compound;

[0056] (4) Mix the carbonized compound in step (3) with 37wt% concentrated hydrochloric...

Embodiment 3

[0061] Catalyst preparation:

[0062] (1) Mix copper nitrate, zinc nitrate, and aluminum nitrate in a molar ratio of 1:1:0.5, then add 25wt% of the total mass of the metal compound and add acetylene carbon black, then ethanol by mass ratio: (carbon-based material+metal compound )=5:1 Add ethanol, stir and mix for 24h, then place in 80°C water bath to obtain slurry;

[0063] (2) Heat the slurry obtained in step (1) to 80° C. and stir for 1 h, evaporate the ethanol in step (1) until the mixture becomes a paste, and dry at 70° C. for 24 h to obtain carbon-coated nano-copper zinc-aluminum catalyst. Precursor;

[0064] (3) Carbonize 40g of the precursor in step (2) under the protection of nitrogen at a rate of 50ml / min, raise the temperature to 600°C at 5°C / min, and keep the temperature constant for 4h, and then take it out after the temperature naturally drops below 80°C to obtain Carbonized compound;

[0065] (4) Mix the carbonized compound in step (3) with 37% concentrated hy...

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Abstract

The invention relates to a preparation method and application of a carbon-coated nano copper-zinc-aluminum catalyst. The method comprises the following steps: mixing a carbon-based material with a metal compound, adding ethanol, and stirring to obtain slurry; drying for 20-28 hours to obtain a precursor of a carbon-coated material; heating at 200-700 DEG C to obtain a carbonized compound; and thenadding the carbonized compound to concentrated hydrochloric acid to obtain an activated carbonization compound; and calcining under nitrogen protection to obtain a carbon-coated nano copper-based catalyst. The preparation method is used for preparing neopentyl glycol by hydrogenating hydroxypivalaldehyde, and has the advantages of high activity and loss resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a method for preparing a carbon-coated nano-copper-zinc-aluminum catalyst for preparing neopentyl glycol by hydrogenating hydroxypivalaldehyde. Background technique [0002] As a chemical raw material with a wide range of uses, neopentyl glycol can be used to produce polyester resin, polyurethane, etc., and can also be used to produce polyester powder coatings, polyurethane foam, surfactants, synthetic plasticizers, and printing inks , insulating materials, polymerization inhibitors, aviation lubricating oil additives and many other products. It is widely used in the fields of automobile, textile, medicine, paint and petroleum, and can also be used for selective separation of cycloalkyl hydrocarbons and aromatics, and has a broad market prospect. [0003] The industrial production routes of neopentyl glycol include isobutyraldehyde route and halogenated propanol ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/10B01J37/08C07C29/141C07C31/20
CPCB01J23/80B01J37/082B01J37/10C07C29/141C07C31/20
Inventor 王荷芳孙洋洋吕建华刘继东
Owner HEBEI UNIV OF TECH
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