Core-shell Cu@Au catalyst as well as preparation method and application thereof

A catalyst and core-shell technology, which is used in the preparation of lactic acid, catalytic oxidation of 1,2-propanediol, bimetallic application of precious metals and non-precious metals, can solve the problems of high cost and difficulty in meeting industrial application requirements, and achieve reduction Catalyst cost, good industrial application value, high catalytic activity effect

Inactive Publication Date: 2016-07-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts have high catalytic activity, the noble metals Au and Pd are used as the active components of the reaction, and TiO 2 As a carrier, it causes problems such as high cost, and it is difficult to meet the requirements of industrial applications.

Method used

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  • Core-shell Cu@Au catalyst as well as preparation method and application thereof
  • Core-shell Cu@Au catalyst as well as preparation method and application thereof
  • Core-shell Cu@Au catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Catalyst preparation:

[0032] The core-shell CuAu nanocatalysts were prepared by reducing copper nitrate and chloroauric acid with hydrazine hydrate. Dissolve 3.78g of copper nitrate trihydrate and 0.378g of Tween in 120ml of absolute ethanol, and ultrasonically dissolve them for 30 minutes to form a mixed solution. When the temperature of the mixed solution rises to 60°C, add 1.5mol / L NaOH ethanol solution drop by drop to adjust the mixed solution The pH value is between 8~9; Then dropwise add dilute ethanol solution of hydrazine hydrate (hydrazine hydrate / 160ml dehydrated alcohol of 16ml85%), and react 2h under magnetic stirring, the nano-copper prepared will be cooled to 30°C; Weigh 0.1g of chloroauric acid tetrahydrate and dissolve it in 20ml of absolute ethanol, add the ethanol solution of chloroauric acid dropwise into the cooled mixture to react for 1 hour. Finally, centrifuge, wash with absolute ethanol, and dry to obtain the core-shell Cu 0.985 Au 0.015 Nan...

Embodiment 2

[0036] Adopt the same catalyst preparation method of embodiment 1, only change the consumption of chloroauric acid tetrahydrate to be 0g, 0.03g, 0.23g and 0.34g, prepare nanocatalyst Cu, Cu 0.995 Au 0.005 、Cu 0.965 Au 0.035 and Cu 0.95 Au 0.05 . Au nanoparticles were prepared by reducing 0.34g chloroauric acid tetrahydrate with hydrazine hydrate in the presence of Tween. The Cu 0.995 Au 0.005 、Cu 0.985 Au 0.015 、Cu 0.965 Au 0.035 and Cu 0.95 Au 0.05 The ratio in the subscript is the molar ratio of Cu and Au.

[0037] figure 1XRD spectra of pure-phase Cu, Au catalysts and CuAu nanobimetallic catalysts with different molar ratios. It can be seen from the XRD spectrum that the pure-phase Cu sample is basically consistent with the data (2θ=43.3, 50.4, 74.1°) on the JCPDS card 04-0836, and the sample is a face-centered cubic pure-phase elemental copper; the same pure-phase Au The sample basically agrees with the data on JCPDS card 46-1043 (2θ=38.2, 44.4, 64.6, 77.5°...

Embodiment 3

[0043] Adopt the same method of embodiment 1 to prepare core-shell Cu 0.985 Au 0.015 Nano-catalyst, the process of catalytic oxidation of 1,2-propanediol adopts the same method as in Example 1, only changing the reaction time to 0.5h, 1h, 2h, and 3h respectively, can obtain different reaction times for catalytic oxidation of 1,2-propanediol The impact of the reaction, the results are shown in Table 2, as the reaction time prolongs, the conversion rate of 1,2-propanediol obviously increases, while the selectivity of lactic acid decreases.

[0044] Table 2 Effect of reaction time on 1,2-propanediol catalytic oxidation reaction

[0045]

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Abstract

The invention belongs to the technical field of 1,2-propylene glycol catalytic oxidation and particularly discloses a method for catalyzing oxidization of 1,2-propylene glycol with a Cu@Au core-shell nanometer material. The invention provides a method for preparing a core-shell Cu@Au nanometer catalyst, and the method comprises the following steps: dissolving copper nitrate hydrate and Tween in absolute ethyl alcohol, performing ultrasonic treatment until the matters are totally dissolved, adjusting the pH value to be 8-9 at the temperature of 60 DEG C with NaOH ethanol solution, dripping hydrazine hydrate ethanol dilute solution dropwise, and preparing nanometer copper; cooling to the temperature of 30 DEG C, adding chloroauric acid ethanol solution, centrifuging the prepared catalyst with absolute ethyl alcohol, washing and drying. The prepared catalyst is used for performing catalytic oxidation on 1,2-propylene glycol to prepare lactic acid in a high pressure reactor. The 1,2-propylene glycol selective oxidization method disclosed by the invention is simple in process and mild in reaction conditions, the catalyst is simple in preparation method, low in cost, and high in stability and catalytic activity, and has good industrial prospects.

Description

technical field [0001] The invention relates to the technical field of catalytic oxidation of 1,2-propanediol, in particular to a method for catalyzing the oxidation of 1,2-propanediol by CuAu core-shell nanomaterials. The invention belongs to the technical field of lactic acid preparation and also belongs to the technical field of bimetallic application of precious metals and non-precious metals. Background technique [0002] The design and preparation of efficient and stable nano-bimetallic catalysts based on nano-synthesis technology and their catalytic applications are hotspots in the field of catalytic chemistry research. The bimetallic nanomaterials obtained by compounding noble metal and non-noble metal nanomaterials can often combine the characteristics of the two materials. When such nanomaterials are used as catalysts, their catalytic properties are different due to their composition, size and structure. [0003] At present, the world is facing problems such as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C59/08C07C51/235
CPCB01J23/8926B01J35/0073C07C51/235C07C59/08
Inventor 薛武平殷恒波卢志鹏
Owner JIANGSU UNIV
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