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Core-shell type catalyst for preparing lactic acid and pyruvic acid by using glycerol, and preparation and application of core-shell type catalyst

A catalyst, pyruvic acid technology, applied in the direction of carboxylate preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of no added value pyruvic acid detected, increased catalyst use cost, low efficiency of precious metal use, etc. , to achieve the effects of controllable nanoparticle size, easy operation and good catalytic performance

Active Publication Date: 2017-06-09
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, the reaction process still needs to use a large amount of alkali, and pyruvic acid with higher added value has not been detected in the product
In a high-concentration strong alkali solution, the active metal is easy to grow, thereby reducing the stability of the catalyst; in addition, the use efficiency of the precious metal is low, which increases the cost of the catalyst

Method used

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  • Core-shell type catalyst for preparing lactic acid and pyruvic acid by using glycerol, and preparation and application of core-shell type catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2.0g TiO 2 Nanoparticles were placed in 100mL of deionized water and ultrasonically dispersed for 30 minutes. Under the condition of stirring speed of 600r / min, 0.1g of hexadecyltrimethylammonium bromide was added to obtain a uniformly dispersed aqueous solution, and then slowly added and dissolved in 10mL 0.28g of chloroplatinic acid (Pt content: 38%) and 0.036g of lead nitrate mixed solution in deionized water, continue stirring for 2 hours, so that metal ions are fully adsorbed to TiO 2 On the surface of nanoparticles, heat the solution to 60°C. Under nitrogen atmosphere, slowly add a certain amount of sodium borohydride aqueous solution to the above solution, and control the molar ratio of sodium borohydride to metal at 10:1. The pH of the solution is around 8-10. After the dripping, continue to stir for 6 hours, filter under reduced pressure, and wash with deionized water for several times until the solution is washed with AgNO 3 The solution detects that th...

Embodiment 2

[0033] Weigh 2.0g TiO 2 The nanoparticles were placed in 100mL of deionized water and ultrasonically dispersed for 30 minutes. Under the condition of stirring speed of 600r / min, 0.08g of polyvinylpyrrolidone was added to obtain a uniformly dispersed aqueous solution, and then 0.106g of polyvinylpyrrolidone dissolved in 10mL of deionized water was slowly added. Chlorauric acid and 0.036g of lead nitrate mixed solution, continue to stir for 2 hours, so that metal ions are fully adsorbed to TiO 2 On the surface of nanoparticles, heat the solution to 80°C, and slowly add a certain amount of sodium borohydride aqueous solution to the above suspension in a nitrogen atmosphere, and control the molar ratio of sodium borohydride to metal to 10:1 , keep the pH of the solution at about 8-10, after the dripping, continue to stir for 6 hours, filter under reduced pressure, wash with deionized water for many times, until the AgNO 3 The solution detects that there is no chloride ion in the ...

Embodiment 3

[0035] Weigh 2.0g CeO 2Nanoparticles were placed in 100mL of deionized water and ultrasonically dispersed for 30 minutes. Under the condition of stirring speed of 600r / min, 0.12g of polyvinyl alcohol was added to obtain a uniformly dispersed aqueous solution, and then 0.034g of polyvinyl alcohol dissolved in 10mL of deionized water was slowly added. Palladium chloride and 0.036g lead nitrate mixed solution, continue to stir for 2 hours, make metal ion be fully adsorbed to CeO 2 On the surface of nanoparticles, heat the solution to 100°C. Under nitrogen atmosphere, slowly add a certain amount of sodium citrate aqueous solution to the above suspension, and control the molar ratio of sodium citrate to metal to 15:1. , keep the pH of the solution at about 8-10, after the dripping, continue to stir for 6 hours, filter under reduced pressure, wash with deionized water for many times, until the AgNO 3 The solution detects that there is no chloride ion in the water, and vacuum-dries ...

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Abstract

The invention provides a core-shell type catalyst for preparing lactic acid and pyruvic acid by carrying out catalytic selective oxidation on glycerol. The core layer of the catalyst is a metal oxide, the shell layer of the catalyst is wrapped by metal, and reduction treatment is then carried out, so that the core-shell type nano-metal catalyst is obtained. The core layer of the catalyst is the metal oxide selected from TiO2, CeO2, ZrO2, MgO or the like, and the shell layer is a composition prepared from one or more precious metals in active metals such as Pt, Au or Pd and auxiliary active metal Pb. The core-shell type catalyst is used in a reaction for preparing the lactic acid and the pyruvic acid by taking a glycerol water solution as a raw material and molecular oxygen as an oxidizing agent; the glycerol conversion rate is 60.6%, the lactic acid selectivity is 48.7%, and the pyruvic acid selectivity is 25.3%. A preparation method of the catalyst is simple, mild in reaction conditions and easy to operate; the catalyst can be recycled and has potential research and industrial application prospects.

Description

technical field [0001] The invention provides a core-shell catalyst for preparing lactic acid and pyruvic acid from glycerin, its preparation and the application of the catalyst in glycerin catalytic selective oxidation of lactic acid and pyruvic acid. Background technique [0002] With the rapid development of biodiesel, the by-product glycerol in the biodiesel production process is in excess, and the conversion of glycerol into high value-added chemicals has become a hot spot in current research. Glycerol is an important raw material in chemical products, which can be oxidized to produce glyceric acid, dihydroxyacetone, lactic acid and acrylic acid, among which lactic acid is a widely used organic acid, and polylactic acid obtained from lactic acid is a biodegradable Polymer materials have great potential for development. At present, the industrial production methods of lactic acid are fermentation method and chemical synthesis method. Among them, the fermentation proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J23/63B01J23/66C07C51/23C07C59/08C07C59/19
CPCC07C51/23B01J23/628B01J23/63B01J23/66B01J35/396B01J35/40C07C59/08C07C59/19Y02P20/584
Inventor 王涛丁云杰张晨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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