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Core-shell structure palladium-copper catalyst and preparation method thereof and catalytic application thereof

A core-shell structure and catalyst technology, applied in the field of core-shell structure palladium-copper catalyst and its preparation, can solve problems such as short lifespan, and achieve the effects of less by-products, lower cost and obvious selectivity

Active Publication Date: 2018-12-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with Lindlar catalyst is that it uses poisonous Pb element and has a short lifetime, and the selectivity needs to be further improved to reduce the generation of by-products

Method used

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  • Core-shell structure palladium-copper catalyst and preparation method thereof and catalytic application thereof
  • Core-shell structure palladium-copper catalyst and preparation method thereof and catalytic application thereof
  • Core-shell structure palladium-copper catalyst and preparation method thereof and catalytic application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] At 60 °C, a certain amount of Pd nanosheets was uniformly dispersed in 5 mL of aqueous solution, and transferred to a 25 mL two-necked bottle. After 40 minutes of passing through hydrogen gas, stop. While keeping the experimental device airtight, a certain amount of Cu(NO 3 ) 2 of aqueous solution. Continue to keep the experimental device airtight and stop after stirring for 1 h. The resulting reaction product was separated by centrifugation and washed several times with ethanol and acetone to be characterized and ready for use. According to the mass ratio of Pd and Cu elements, the obtained catalyst loadings are different. see results Figure 1~3 .

Embodiment 2

[0036] Wash the palladium-copper catalyst in Example 1 with ethanol for 3 times, dry, take 1 umol and disperse it in 10ml ethanol, disperse it ultrasonically, put it in a water bath at 30°C, add 2mmol phenylacetylene after stirring for 5min, and pass through 0.1MPa H 2 .

[0037] At the same time, the catalyst was recycled to examine its stability. see results Figure 4 with 7 .

Embodiment 3

[0039] Wash the same amount of Pd nanosheets before reacting with copper in Example 1 with ethanol for 3 times, dry, take 1 umol and disperse it in 10ml ethanol, ultrasonically disperse, put it in a 30°C water bath, add 2mmol phenylacetylene after stirring for 5min, pass 0.1MPaH 2 .

[0040] see results Figure 5 .

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Abstract

The invention discloses a core-shell structure palladium-copper catalyst and a preparation method thereof and catalytic application thereof, and belongs to the field of nanocatalysis. The core-shell structure palladium-copper catalyst comprises a palladium nanosheet and a copper shell layer coating the surface of the palladium nanosheet, wherein the palladium nanosheet has a size of 5 to 200 nm and a thickness of 0.5 to 3 nm; and the thickness of the copper shell is 0.1 to 10 nm. The palladium nanosheet is dispersed in water, hydrogen gas is introduced, after the reaction, an aqueous solutioncontaining copper ions is added, and sealing reaction is continued to obtain the core-shell structure palladium-copper catalyst. An catalytic application method is as follows: the core-shell structurepalladium-copper catalyst is collected by centrifugation, washed with ethanol and dried to obtain catalyst powder; the catalyst powder is dispersed in ethanol, phenylacetylene is added to a water bath and stirred, and H2 is introduced to react.

Description

technical field [0001] The invention relates to the field of nano-catalysis, in particular to a palladium-copper catalyst with a core-shell structure, a preparation method and catalytic application thereof. Background technique [0002] Selective hydrogenation plays an important role in industrial production, for example, it plays an important role in the synthesis of fine chemicals, pharmaceuticals, health care products and agrochemicals. Among them, suppressing the side reaction of deep hydrogenation of alkynes to alkanes is one of the major challenges in this field. In order to improve the selectivity of alkyne hydrogenation to olefins and reduce the generation of by-products, researchers have developed a series of strategies. A classic strategy is to construct metal-organic interfaces by modifying organics on the surface of active metals, which is done in the synthesis of catalysts or catalytic reactions. Another classic strategy is to improve selectivity by constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C5/05C07C15/46
CPCB01J23/8926C07C5/05C07C2523/89C07C15/46
Inventor 郑南峰刘锟隆陈洁刘圣杰
Owner XIAMEN UNIV
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