Preparation method of hydrogenation catalyst and catalyst

A hydrogenation catalyst and catalyst technology are applied in catalyst activation/preparation, preparation of organic compounds, preparation of carbon-based compounds, etc., which can solve the problems of large consumption of reducing agents and lye, and achieve short reaction time and hydrogenation catalytic activity. High, high dispersion effect

CN106423161AActive Publication Date: 2017-02-22XIANGTAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-22

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Abstract

The invention provides a preparation method of a hydrogenation catalyst. The catalyst is Pd-CeO2 / active-carbon catalyst. The preparation method comprises the following steps: (A) pretreatment for the active carbon; (B) preparation of a CeO2 / active-carbon composite carrier: dissolving cerate in alcohol, mixing the solution with the active carbon treated by acid, using NaOH solution or KOH solution to regulate pH value of the formed solution to 9-13, putting the solution with regulated pH value into a microwave device to carry out microwave radiation reaction, carrying out washing, solid-liquid separation and drying on obtained products to obtain the CeO2 / active-carbon composite carrier; and (C) preparation of the Pd-CeO2 / active-carbon catalyst: dispersing the composite carrier in water, mixing with methanol and chloropalladic acid solution, carrying out photoreduction on the mixed solution under the ultraviolet light, and carrying out solid-liquid separation and drying on the obtained products to obtain the Pd-CeO2 / active-carbon catalyst. The preparation method provided by the invention is simple and is short in production cycle, and the obtained catalyst is good in dispersibility and high in catalytic activity.
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Description

technical field

[0001] The present invention relates to the field of catalyst preparation methods, in particular to a preparation method of a novel nanocomposite hydrogenation catalyst, a hydrogenation catalyst prepared by the method, and the use of the hydrogenation catalyst in the selective hydrogenation of phenol to prepare cyclohexanone application. Background technique

[0002] Cerium dioxide is a rare earth metal oxide with the advantages of cubic phase structure, good dispersion, moderate hardness and good precision, and is widely used in various fields of industry. And because it has good oxygen storage and release performance, and its existence can not only improve the catalytic activity of the catalyst but also improve the thermal stability of the catalyst, so it is used more and more as a catalyst carrier. However, ceria itself has a relatively small specific surface area and poor mechanical strength, so it is not suitable to be directly used as a catalyst carrie...

Examples

Embodiment 1

[0042] Add activated carbon to 10% dilute nitric acid, heat and reflux in a water bath at 60°C for 2 hours, filter, wash with deionized water, and dry at 120°C to obtain acid-treated activated carbon. Take 1.459gCe(NO 3 ) 3 ·6H 2 O was dissolved in 120mL absolute ethanol and stirred until Ce(NO 3 ) 3 ·6H 2 O is completely dissolved, add 5g of activated carbon, continue to stir, adjust the pH to 10 with 0.1mol / L NaOH solution, put the solution into a microwave reactor, and react with 214W for 10s and 10s alternately for 10 minutes, so the microwave irradiation time is 5min, the resulting solution was washed with absolute ethanol and deionized water, filtered, and dried at 120°C to obtain CeO 2 Mass fraction of 10% CeO 2 / AC carrier. Take 0.582gCeO 2 / AC dispersed in 100mL deionized water, add 5mL methanol, 1.5mL chloropalladium acid solution, ultrasonically disperse for 30min, then place the solution under ultraviolet light for 10h, filter the obtained solution, and vac...

Embodiment 2

[0044] With embodiment 1, the difference is that Pd-CeO 2 The mass fraction of Pd in ​​ / AC is 2%, that is, 2%Pd-10%CeO 2 / AC.

Embodiment 3

[0046] With embodiment 1, the difference is that Pd-CeO 2 CeO in / AC 2 The mass fraction is 15%, that is, 3%Pd-15%CeO 2 / AC.