Application of nickel-based catalyst with high-specific-surface-area hydrophilic activated carbon as carrier in catalytic hydrogenation hydrolysis

A high specific surface area, nickel-based catalyst technology, used in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrolysis preparations, etc., can solve the problems of improving atomic utilization, difficulty, etc. The effect of high selectivity, high yield and high specific surface area

Active Publication Date: 2021-07-09
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported nickel-activated carbon catalysts are mainly used for the hydrogenolysis of lignin and model compounds, and it is difficult to improve the atom utilization rate through hydrolysis reactions.

Method used

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  • Application of nickel-based catalyst with high-specific-surface-area hydrophilic activated carbon as carrier in catalytic hydrogenation hydrolysis
  • Application of nickel-based catalyst with high-specific-surface-area hydrophilic activated carbon as carrier in catalytic hydrogenation hydrolysis
  • Application of nickel-based catalyst with high-specific-surface-area hydrophilic activated carbon as carrier in catalytic hydrogenation hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0025] Embodiment: preparation catalyst Ni / AC-2

[0026] 1.65g nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) put into beaker, add 5mL deionized water. After stirring until it is completely dissolved, add 3 g of high specific surface area hydrophilic activated carbon (AC-2) carrier into the above solution, and continue stirring to ensure a high degree of dispersion. Then the mixed solution was vacuum impregnated in a vacuum box for 24 h. The impregnated mixture was dried at 105°C for 12h, then calcined in an argon (Ar) atmosphere at 450°C for 3h at a gas flow rate of 70mL / min, followed by hydrogen (H at 450°C) 2 ) atmosphere for 3 hours, and the gas flow rate is also 70mL / min. After the reduction, the gas flow rate is 70mL / min under an argon (Ar) atmosphere, cooled to room temperature, and sealed for storage. The obtained Ni / AC catalyst was named Ni / AC-2.

Embodiment 2

[0040] Embodiment 2: the catalytic reaction of diphenyl ether (DPE)

[0041] (1) Put 100mg of reaction substrate diphenyl ether, 50mg of catalyst and 20mL of isopropanol together into a 100mL stainless steel autoclave, seal and pass through hydrogen to remove the residual air in the reactor;

[0042] (2) Continuously feed hydrogen at room temperature to pressurize the reactor to 1MPa, then raise the temperature to the required reaction temperature of 180°C, and stir the reaction for 120min at a vigorous stirring speed of 800rpm;

[0043] (3) After the reaction, the reaction system was naturally cooled to room temperature and the pressure was released, the catalyst was removed by filtration, and the obtained organic phase was analyzed by GC-MS and GC.

[0044]Activated carbon samples AC-1, AC-2 and the Ni / AC-1 catalyst prepared by the comparative example were respectively subjected to the catalytic reaction of diphenyl ether, the reaction conditions were the same as in Example ...

Embodiment 3

[0050] The Ni / AC-2 catalyst prepared in Step 1 was used to catalyze the reaction of diphenyl ether. The reaction conditions were the same as in Example 2 except that the temperature was 160° C. and the reaction time was kept different, and the product was analyzed at the same time.

[0051] Such as Figure 6 Shown, by Ni / AC-2 catalyst catalyzed diphenyl ether C-O bond cracking effect with reaction time change result, in the reaction process, strengthen the hydrophilicity of catalyst, can obtain the hydrolysis reaction product of more than 20%, improved hydrolysis Efficiency also significantly improves the selectivity of cyclohexanol in the product.

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Abstract

The invention discloses application of a nickel-based catalyst with high-specific-surface-area hydrophilic activated carbon as a carrier in catalytic hydrogenation hydrolysis, a nickel source is used as a precursor, the high-specific-surface-area and strong-hydrophilicity activated carbon is used as the carrier, and the high-activity nickel-based catalyst Ni / AC is synthesized by adopting an impregnation method; and the prepared nickel-based catalyst also has high specific surface area and high catalyst activity, can efficiently catalyze diphenyl ether hydrogenation and hydrolysis under mild conditions when isopropanol is used as a solvent, has a conversion rate of 100%, high selectivity and high yield, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to the application of a nickel-based catalyst, in particular to the application of a nickel-based catalyst with a high specific surface area hydrophilic activated carbon as a carrier in catalytic hydrogenation and hydrolysis. Background technique [0002] For the chemical industry, lignin contains a large number of natural phenolic biopolymers, which can be used to produce high value-added liquid fuels and other intermediate sustainable chemicals. A large number of C-O bonds exist in the molecular structure of lignin, mainly including α-O-4, β-O-4 and 4-O-5, therefore, the selective cracking of C-O bonds is the key to realize the directional depolymerization of lignin one of the steps. Among these C-O bonds, the 4-O-5 bond has the highest energy and is the most stable. Although the cleavage of C–O bonds in lignin building blocks is well known, less research has been done on the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/10C07C29/10C07C35/08
CPCB01J23/755B01J35/1004C07C29/10C07C35/08
Inventor 曹景沛江玮赵小燕解金旋赵亮张创
Owner CHINA UNIV OF MINING & TECH
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