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Carbon-loaded gold atom cluster catalyst and application thereof in catalytic oxidation of glucose

A technology of atomic clusters and catalysts, which is applied in the field of carbon-supported gold atomic cluster catalysts and its application in the catalytic oxidation of glucose, can solve the problems of poor reusability of nano-gold catalysts, difficulties in scale-up production, and complicated preparation processes, and achieve broad industrial Application prospect, high stability and good reactivity

Active Publication Date: 2017-11-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to the carbon-supported gold catalyst prepared by the colloidal method, the preparation process of mesoporous carbon and titanium-silicon molecular sieves is complicated, and it is difficult to scale up production, and there is no data on the reuse of the above two catalysts.
However, the alumina-supported nano-gold catalyst has disadvantages such as poor reusability.

Method used

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  • Carbon-loaded gold atom cluster catalyst and application thereof in catalytic oxidation of glucose
  • Carbon-loaded gold atom cluster catalyst and application thereof in catalytic oxidation of glucose
  • Carbon-loaded gold atom cluster catalyst and application thereof in catalytic oxidation of glucose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Catalyst preparation process: Weigh a certain amount of chloroauric acid into the flask, and add tetrahydrofuran solvent. Then add an appropriate amount of TOABr. After stirring for 1-10 minutes, add an appropriate amount of mercaptan or triphenylphosphine. Then stir for 10-30 minutes and add an appropriate amount of NaBH 4 (dissolved in ice water). Stir for 5-10 hours to stop the reaction. The product was washed with n-hexane and dichloromethane, and the precipitated solid was extracted with dichloromethane to obtain a gold atom cluster catalyst (AuNC) protected by thiol or triphenylphosphine. Weigh a certain amount of gold clusters dissolved in dichloromethane, then add an appropriate amount of activated carbon , Activated carbon is acidified before use, and stirred at room temperature for 7-8 hours. After the stirring was stopped, the samples were centrifuged and dried in a vacuum oven. Finally, the carbon-supported gold atom clusters are calcined at 120° C.-3...

Embodiment 2

[0035] Catalytic conversion experiment: the gold atom cluster catalyst prepared in Example 1 was used as the catalyst. The concentration of glucose is 5%, the molar ratio of glucose and gold in the catalyst is 1000:1, oxygen is continuously introduced under stirring conditions, and the reaction temperature is kept at 60°C. During the reaction, NaOH solution is continuously added dropwise to keep the pH of the solution = 9.5 . Constant temperature reaction until the pH of the reaction system does not change, the reaction ends. Stand still after the reaction, wash and precipitate the catalyst for future use. The product was analyzed by HPLC, and the selectivity of sodium gluconate was 99%.

Embodiment 3

[0037] Catalytic conversion experiment: 1% AuNC / AC prepared in Example 1 was used as a catalyst, and the 1% AuNC / AC catalyst was subjected to air calcination at temperatures of 80°C, 120°C, 150°C, and 300°C. Carry out the glucose oxidation reaction after the treatment, keep the molar ratio of glucose and gold at 1000:1, feed oxygen continuously under the condition of constant stirring, keep the reaction temperature at 60°C, add NaOH solution dropwise during the reaction, keep the pH of the solution= 9.5. Constant temperature reaction until the pH of the reaction system does not change, the reaction ends. Stand still after the reaction, wash and precipitate the catalyst for later use, the effect of the treatment temperature of 1% AuNC / AC on its glucose oxidation reaction activity surface 1 (reaction time 15min).

[0038] surface 1

[0039] Processing temperature Glucose conversion rate% Sodium gluconate selectivity% other% unprocessed 65 98.3 1.7...

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Abstract

The invention provides a carbon-loaded gold atom cluster catalyst and an application thereof in catalytic oxidation of glucose. The catalyst is an activated carbon-loaded gold atom cluster (AuNC) catalyst. The method comprises the following steps: with mercaptan or triphenyl phosphine as a ligand, preparing a gold atom cluster by means of an NaBH4 reduction method; then loading the gold atom cluster to an activated carbon carrier; and applying the carbon-loaded gold atom cluster catalyst to a catalytic oxidation reaction of glucose in an alkaline condition. The catalyst is good in catalytic reaction activity and high in stability, and can be recycled for more than 10 times; in the repeated using process, the activity of the catalyst is not obviously reduced while the selectivity of a product is kept at 98% or above, so that the carbon-loaded gold atom cluster catalyst has a very wide industrial application prospect.

Description

technical field [0001] The invention relates to a carbon-supported gold atom cluster catalyst and its application in glucose catalytic oxidation. Background technique [0002] Gluconic acid and its salts, such as sodium gluconate, calcium gluconate, etc., are a class of important chemical, pharmaceutical and food raw materials and intermediates. Gluconic acid can be used in the dairy industry to prevent milk stone precipitation; as a sour agent in food formulations; and can be used in cleaning agents, fabric processing and metal processing additives, secondary oil recovery anti-sedimentation agents, etc. The metal ion salts made of gluconic acid and sodium, calcium, zinc, ferrous iron are widely used in chemical industry, food, medicine, light industry and other industries. Sodium gluconate is used as an excellent chelating agent in water treatment, electroplating and other departments; calcium gluconate, zinc, ferrous, magnesium, etc. are used in the food industry to suppl...

Claims

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Application Information

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IPC IPC(8): B01J23/52C07C51/21C07C59/105
CPCB01J23/52C07C51/21C07C59/105
Inventor 黄家辉李皋张军营刘超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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