Preparation method of microwave radiation enhancement alkali-modified carbon-supported noble metal catalyst for production of cinnamyl alcohol by means of selective hydrogenation

A noble metal catalyst and microwave radiation technology, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, and organic compound preparation, can solve the problem of no microwave-enhanced alkali-modified activated carbon, etc., and achieve easy The effect of control, low cost and simple operation

Active Publication Date: 2019-01-18
SHAANXI NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above-mentioned authorized or published invention patents, all use alkali-modified activated carbon alone or single-microwave-treated activated carbon or alkali-modified activated carbon followed by microwave treatment. There is no technology that combines microwave and alkali modification at the same time, that is, there is no microwave Invention Technology of Enhanced Alkali Modified Activated Carbon

Method used

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  • Preparation method of microwave radiation enhancement alkali-modified carbon-supported noble metal catalyst for production of cinnamyl alcohol by means of selective hydrogenation
  • Preparation method of microwave radiation enhancement alkali-modified carbon-supported noble metal catalyst for production of cinnamyl alcohol by means of selective hydrogenation
  • Preparation method of microwave radiation enhancement alkali-modified carbon-supported noble metal catalyst for production of cinnamyl alcohol by means of selective hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 20.0g of wood activated carbon powder (referred to as AC-1), uniformly stir and disperse it into 200mL KOH aqueous solution with a mass fraction of 25% at a temperature of 90°C, and under the action of microwave radiation with a power of 1.5kW, the original Modified activated carbon for 90min. After the modification is finished, the reaction solution is filtered, the modified activated carbon is washed with deionized water until the pH of the filtrate is neutral, and the filter cake is transferred to a blast drying oven at 110° C. for drying to obtain the modified activated carbon (note for AC-1-W25K).

[0022] Using the impregnation method, add the AC-1-W25K prepared above into distilled water to make a slurry, then add 10g / L aqueous solution of chloroplatinic acid to the slurry according to the platinum loading of 1wt%, keep stirring, and during the stirring process Adjust the pH of the solution to 10.0 with potassium hydroxide aqueous solution, then continue t...

Embodiment 2

[0024] Weigh 20.0g of wood activated carbon powder (referred to as AC-2), uniformly stir and disperse it into 400mL NaOH aqueous solution with a mass fraction of 25% at a temperature of 55°C, and under the action of microwave radiation with a power of 1.5kW, the original Modified activated carbon for 60min. After the modification is finished, the reaction solution is filtered, the modified activated carbon is washed with deionized water until the pH of the filtrate is neutral, and the filter cake is transferred to a blast drying oven at 110° C. for drying to obtain the modified activated carbon (note is AC-2-W25Na).

[0025] Using the impregnation method, add the AC-2-W25Na prepared above into distilled water to make a slurry, and then add 10 g / L of chloroplatinic acid aqueous solution to the slurry according to a platinum loading of 1 wt%, keep stirring, and in the stirring process Adjust the pH of the solution to 10.0 with potassium hydroxide aqueous solution, then continue...

Embodiment 3

[0027] Take by weighing 20.0g apricot shell activated carbon powder (referred to as AC-3), it is uniformly stirred and dispersed into 200mL temperature is that the mass fraction of 75 ℃ is in the NaOH aqueous solution of 15%, and under the microwave radiation effect that power is 1.5kW, Activated carbon was modified in situ for 90 min. After the modification is finished, the reaction solution is filtered, the modified activated carbon is washed with deionized water until the pH of the filtrate is neutral, and the filter cake is transferred to a blast drying oven at 110° C. for drying to obtain the modified activated carbon (note is AC-3-W15Na).

[0028] Using the impregnation method, add the AC-3-W15Na prepared above into distilled water to make a slurry, and then add 10 g / L of chloroplatinic acid aqueous solution to the slurry according to the platinum loading of 1 wt%, keep stirring, and in the stirring process Adjust the pH of the solution to 10.0 with potassium hydroxide ...

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Abstract

The invention discloses a preparation method of a microwave radiation enhancement alkali-modified carbon-supported noble metal catalyst for production of cinnamyl alcohol by means of selective hydrogenation. The method comprises the steps of dispersing activated carbon powder into an alkaline solution at 50-100 DEG C, and carrying out modification treatment on activated carbon for 10-120 min undermicrowave irradiation to obtain modified activated carbon; then, using an impregnation method to prepare the platinum or palladium supported catalyst by taking the modified activated carbon as a carrier. The method adopts microwave radiation enhancement alkali modification, and has a remarkable pore-expanding effect on the activated carbon, thus greatly increasing the proportion of mesopores; furthermore, the types and number of oxygen-containing groups of the activated carbon are increased, and the content of impurities such as silicon and aluminum is greatly reduced. The catalyst prepared by the method is used for catalyzing a reaction for producing the cinnamyl alcohol by means of selective hydrogenation of cinnamyl aldehyde, and the yield of the cinnamyl alcohol is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a preparation method of a microwave radiation-enhanced alkali-modified carbon-supported noble metal catalyst for selective hydrogenation of cinnamyl alcohol. Background technique [0002] The d electrons in the outermost layer of atoms of noble metal elements can easily form covalent bonds with hydrogen atoms or oxygen atoms, thus showing high activity for reduction reactions, oxidation reactions, etc. Therefore, the catalytic reactions involving noble metal catalysts can be carried out under mild conditions and exhibit the advantages of high selectivity and high yield. Among them, carbon-supported noble metal catalysts have been widely used in the chemical industry, medicine and health, food processing and fields of environmental protection. [0003] As a carbon-supported noble metal catalyst, activated carbon has a well-developed pore structure, high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J37/02B01J37/34C07C29/141C07C33/32
CPCB01J23/42B01J23/44B01J37/0201B01J37/346C07C29/141C07C33/32
Inventor 刘昭铁曾利辉张之翔延浩翔曾永康刘忠文
Owner SHAANXI NORMAL UNIV
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