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Catalyst for hydrogenation of alkynes and preparation method thereof

A hydrogen preparation and catalyst technology, which is applied in the field of catalysts and preparations for alkyne hydrogenation reactions, can solve problems such as catalyst poisoning, catalytic activity reduction, and safety hazards in catalytic reactions, and achieve high-efficiency conversion, increase selectivity, avoid energy consumption and Effects of Environmental Pollution

Active Publication Date: 2020-05-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of alkenes by semihydrogenation of alkynes is a common synthetic route. For example, the widely used Lindela catalyst can effectively inhibit the further hydrogenation of alkenes, but the poisoning of the catalyst leads to the reduction of catalytic activity, and the conditions of high temperature heating and high The use of pure hydrogen brings certain safety hazards to the catalytic reaction

Method used

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  • Catalyst for hydrogenation of alkynes and preparation method thereof
  • Catalyst for hydrogenation of alkynes and preparation method thereof
  • Catalyst for hydrogenation of alkynes and preparation method thereof

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preparation example Construction

[0038] The application also provides the preparation method of the catalyst for the hydrogenation of alkynes, including:

[0039] Reacting gold-palladium bimetallic nanomaterials, imidazole compounds and zinc sources in a solvent to obtain a catalyst for the hydrogenation of alkynes, the catalyst for the hydrogenation of alkynes is composed of gold-palladium bimetallic nanomaterials coated with The ZIF metal-organic framework material on the surface of the gold-palladium bimetallic nanomaterial is composed.

[0040] In the above preparation of the catalyst for the hydrogenation reaction of alkynes, the gold-palladium bimetallic nanomaterial is a material well known to those skilled in the art, and its preparation method is carried out according to a scheme well known to those skilled in the art; for example, gold nanorods Add K to the cetyltrimethylammonium bromide solution sequentially 2 PdCl 4 aqueous solution, hydrochloric acid solution and ascorbic acid solution, and the...

Embodiment 1

[0049] Embodiment 1 Preparation of gold nanorods

[0050] Weigh 355.335mg cetyltrimethylammonium bromide (CTAB), add 9.75mL water to make a 0.1M solution; take 0.25mL 0.01M HAuCl 4 solution, 0.6 mL of 0.01M NaBH 4 Add the solution in sequence, shake it for 2 minutes and let it stand at 30°C for 2 hours. The solution turns brown, and it is used as the seed crystal solution;

[0051] Take 10mL 0.1M CTAB solution, add 0.5mL 0.01MHAuCl in turn 4 solution, 0.1mL 0.01M AgNO 3 Solution, 0.2mL HCl with a concentration of 1M and 80μL ascorbic acid (AA) with a concentration of 0.1M. After proper shaking, the solution becomes colorless and used as the growth solution; take 15μL from the seed solution and add it to the growth solution, and let it stand for 12h , to obtain a brown-red Au NRs solution; water was used as a solvent for three times of centrifugation at 8000r / min, and the ICP was measured to prepare an aqueous solution of gold nanorods with a gold element concentration of 1 ...

Embodiment 2

[0053] Example 2 Preparation of gold nanorod core / palladium shell bimetallic nanostructure

[0054] Take 8.85 mL of CTAB aqueous solution with a concentration of 10 mM, add 0.5 mL of gold nanorods with a concentration of 1 mg / mL, and then add 0.5 mL of K with a concentration of 0.01 M 2 PdCl 4 Aqueous solution, 0.1mL HCl solution with a concentration of 1M and 0.1mL ascorbic acid (AA) with a concentration of 0.2M were stirred evenly and placed in an oil bath at 50°C for 2 hours; after the reaction was completed, water was used as a solvent and centrifuged at 8000r / min for three times Then measure the ICP, and formulate an aqueous solution of gold nanorods with a gold element concentration of 1 mg / mL.

[0055] The present invention has carried out transmission electron microscope detection to the gold nanorod core / palladium shell bimetallic nanostructure used in the present embodiment, and the result is as follows figure 2 as shown, figure 2 It is the TEM photograph of the...

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Abstract

The invention provides a catalyst for an alkyne hydrogenation reaction. The catalyst comprises a gold-palladium bimetallic nanomaterial and a ZIF metal organic framework material coated on the surfaceof the gold-palladium bimetallic nanomaterial. The invention also provides a preparation method of the catalyst, and the method comprises the step of performing a reaction on the gold-palladium bimetallic nanomaterial, imidazole compounds and a zinc source in a solvent so as to obtain the catalyst for the alkyne hydrogenation reaction. Through coordination of central zinc metal ions with the imidazole compounds, coating on the surface of the gold-palladium bimetallic nanomaterial is achieved so as to prepare the catalyst with the metal organic framework material-coated bimetallic nanomaterial; and the catalyst is applied to photo-driven alkyne hydrogenation reactions, and exhibits excellent hydrogenation activity and excellent selectivity to olefin products.

Description

technical field [0001] The invention relates to the technical field of metal catalysts, in particular to a catalyst for hydrogenation of alkynes and a preparation method thereof. Background technique [0002] As a clean and sustainable energy source, solar energy is converted into electrical energy, chemical energy and other forms of energy through a certain medium to solve the problems of energy depletion and environmental pollution. Semiconductors are common light-absorbing media, but most semiconductor materials absorb light in the ultraviolet region, which cannot effectively absorb and utilize all solar energy. As an important class of media, plasmons of metal nanomaterials can convert visible and near-infrared light, which accounts for more than 95% of sunlight, into chemical energy for driving catalytic reactions. [0003] Gold nanorods have good properties of absorbing visible and near-infrared light, and integrating catalytically active metals onto the surface of go...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C07C67/303C07C69/593
CPCB01J31/1691B01J31/1815B01J35/0073B01J2231/645B01J2523/19B01J2523/824C07C67/303C07C69/593
Inventor 熊宇杰黄浩龙冉
Owner UNIV OF SCI & TECH OF CHINA
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