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Palladium-carbon catalyst as well as preparation method and application thereof

A carbon catalyst and activator technology, applied in catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of complex operation, low conversion rate, long incubation time, etc., and achieve mild reaction conditions and good stability. , the effect of easy operation

Active Publication Date: 2022-03-11
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bacterial reduction method generally uses Acetobacter xylinum to reduce vanillin to vanillyl alcohol. This method is complicated to operate, takes a long time to cultivate, and the conversion rate is relatively low.
The lignin oxidative degradation method uses copper sulfate as a catalyst and 1-butyl-3-methylimidazolium triazolium salt as a solvent to oxidatively degrade lignin into vanillyl alcohol. This method requires relatively high temperature and pressure, and the yield of vanillyl alcohol and less selective

Method used

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  • Palladium-carbon catalyst as well as preparation method and application thereof
  • Palladium-carbon catalyst as well as preparation method and application thereof
  • Palladium-carbon catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0046] The preparation method of palladium-carbon catalyst, comprises the steps:

[0047] Palladium nanoparticles are loaded on an activated carbon carrier and then calcined to obtain a palladium-carbon catalyst;

[0048] The preparation of the activated carbon carrier includes: the fermentation residue is roasted to obtain biochar, and the biochar is activated and roasted to obtain the activated carbon carrier; the fermentation residue is mainly produced by joint anaerobic fermentation of kitchen waste and anaerobic sludge. have to.

[0049]The preparation method of the palladium-carbon catalyst of the present invention makes full use of the carbon and nitrogen elements in the fermentation residue of kitchen waste to prepare a nitrogen-containing porous activated carbon carrier with a high specific surface area; the activated carbon carrier contains more pyridine nitrogen, which can play a role in dispersion and The role of anchoring palladium particles, and the adsorption p...

Embodiment 1～12

[0092]Embodiment provides the preparation method of palladium-carbon catalyst, comprises the steps:

[0093] (1) Preparation of activated carbon carrier: Kitchen waste and anaerobic sludge are crushed separately and the TSS is adjusted to 20g / L respectively, and then the treated food waste and anaerobic sludge are mixed according to the mass ratio of 9:1, and carbonic acid The pH value was adjusted by sodium hydrogen to 8, and the anaerobic fermentation was carried out at room temperature for 8 days. After the anaerobic fermentation, the fermented slag was obtained by washing and centrifuging for many times, and the yield of the fermented slag was 42.8%. Then put the fermentation slag in a tube furnace and roast it under a nitrogen atmosphere to obtain biochar; soak the obtained biochar and KOH aqueous solution at a certain mass ratio for 12 hours, then dry it, and place the dried biochar in a tube furnace, Calcined under nitrogen atmosphere, washed with water to neutrality an...

Embodiment 13

[0103] This example provides 12 groups of methods for preparing vanillyl alcohol by catalytic hydrogenation of vanillin, the only difference being that the palladium-carbon catalyst is different. The method for preparing vanillyl alcohol by the catalytic hydrogenation of vanillin of the present embodiment comprises the following steps:

[0104] Take 2 mmol of vanillin, 20 mL of water and 10 mg of palladium-carbon catalyst, mix them uniformly, and react at 30°C under a hydrogen atmosphere of 0.7 MPa for 90 minutes. Wherein, the palladium-carbon catalysts used in the methods of the first group to the twelfth group are the palladium-carbon catalysts prepared in Examples 1-12 respectively.

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Abstract

The invention relates to the technical field of palladium-carbon catalysts, in particular to a palladium-carbon catalyst as well as a preparation method and application thereof. The preparation method of the palladium-carbon catalyst comprises the following steps: loading palladium nanoparticles on an activated carbon carrier, and roasting to obtain the palladium-carbon catalyst, the preparation method of the activated carbon carrier comprises the following steps: roasting fermentation residues to obtain biochar, and activating and roasting the biochar to obtain the activated carbon carrier; the fermentation residues are mainly prepared from kitchen waste and anaerobic sludge through joint anaerobic fermentation. The nitrogen-containing porous activated carbon carrier with a high specific surface area is prepared by fully utilizing carbon and nitrogen elements in the kitchen waste fermentation residues; the active carbon carrier contains more pyridine nitrogen, can play a role in dispersing and anchoring palladium particles, has better aldehyde group adsorption performance than a benzene ring, and has better vanillin adsorption performance than vanillyl alcohol, so that the prepared palladium-carbon catalyst can efficiently reduce vanillin into vanillyl alcohol under mild conditions.

Description

technical field [0001] The invention relates to the technical field of palladium-carbon catalysts, in particular to a palladium-carbon catalyst and its preparation method and application. Background technique [0002] Vanillyl alcohol, that is, 4-hydroxy-3-methoxybenzyl alcohol, has a unique fragrance and is an important food flavoring agent, which can be used for flavoring and fixing of food and cosmetics. At the same time, vanillyl alcohol, as a component of Gastrodia elata tubers, has certain sedative and choleretic effects. The existing vanillyl alcohol preparation methods are mainly bacterial reduction method and lignin oxidation degradation method. The bacterial reduction method generally uses Acetobacter xylinum to reduce vanillin to vanillyl alcohol. This method is complicated to operate, takes a long time to cultivate, and the conversion rate is relatively low. The lignin oxidative degradation method uses copper sulfate as a catalyst and 1-butyl-3-methylimidazoliu...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J27/24B01J32/00B01J35/10B01J37/36B01J37/08B01J37/16C07C41/26C07C43/23
CPCB01J23/44B01J27/24B01J37/36B01J37/082B01J37/16B01J37/08C07C41/26B01J35/23B01J35/618C07C43/23
Inventor 蒋智成郭兴杰张文华黄鑫石碧
Owner SICHUAN UNIV
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