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Preparation method and application of Au-coated Pd core-shell structure ultra-long nanowire in water phase

A core-shell structure and nanowire technology is applied in the field of preparation of bimetallic nanomaterials, which can solve problems such as increased cost and air pollution, and achieve the effects of green reaction, low energy consumption, and uniform appearance.

Pending Publication Date: 2022-05-27
HENAN UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

However, the reaction needs to be carried out in an organic solvent, metal-organic precursors are also needed, and the reducing agent is also organic, which not only increases the cost, but also brings air pollution

Method used

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  • Preparation method and application of Au-coated Pd core-shell structure ultra-long nanowire in water phase
  • Preparation method and application of Au-coated Pd core-shell structure ultra-long nanowire in water phase
  • Preparation method and application of Au-coated Pd core-shell structure ultra-long nanowire in water phase

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preparation example Construction

[0030] A preparation method of Au@Pd core-shell structure ultra-long nanowires in aqueous phase, comprising the following steps:

[0031] Step 1, take by weighing a certain amount of 1-hexadecyl-3-methylimidazolium chloride ([C 16 mim]Cl) is mixed with the ionic liquid aqueous solution that molar concentration is 0.025-0.10M, standby;

[0032] Step 2, get 5mL of the ionic liquid aqueous solution in step 1 and add it to the round-bottomed flask;

[0033] Step 3, in the round-bottomed flask of step 2, the amount of material added earlier is 0.002-0.004mmol of HAuCl 4 , and then add the amount of Na of 0.001-0.003 mmol 2 PdCl 4 , and finally add KBr with an amount of 0.004-0.005 mmol; fully mix the above reactants to obtain a reaction solution;

[0034] Step 4. Weigh ascorbic acid, add distilled water, prepare an ascorbic acid aqueous solution with a molar concentration of 0.1-0.2M, take a certain volume of ascorbic acid aqueous solution and add it to the reaction solution ob...

Embodiment 1

[0037] 1) Weigh a certain amount of ionic liquid [C 16 mim]Cl, make up to 100 mL, and prepare [C with a molar concentration of 0.10 M 16 mim]Cl aqueous solution;

[0038] 2) Take 5mL of [C in step 1) 16 mim]Cl aqueous solution into a round-bottomed flask;

[0039] 3) In the round-bottomed flask of step 2), first add HAuCl with an amount of material of 0.003 mmol 4 , and then add the amount of the substance is 0.002mmol of Na 2 PdCl 4 , and finally add KBr with an amount of 0.004 mmol; fully mix the above reactants to obtain a reaction solution;

[0040] 4) Weigh ascorbic acid, add distilled water, prepare an aqueous solution of ascorbic acid with a molar concentration of 0.1M, and add 0.5 mL to the reaction solution in step 3); gently shake the round-bottomed flask to mix the reaction solution uniformly, then keep it at 30°C Set the reaction for 10h to prepare the reaction mixture;

[0041] 5) Centrifuge the reaction mixture obtained in step 4), discard the supernatant ...

Embodiment 2

[0043] 1) Weigh a certain amount of ionic liquid [C 16 mim]Cl, make up to 100mL, and prepare [C with a molar concentration of 0.080M 16 mim]Cl aqueous solution;

[0044] 2) Take 5 mL of [C in step 1) 16 mim]Cl aqueous solution into a round-bottomed flask;

[0045] 3) In the round-bottomed flask of step 2), first add HAuCl with an amount of material of 0.004 mmol 4 , and then add the amount of the substance is 0.001mmol of Na 2 PdCl 4 , and finally add KBr with an amount of 0.005 mmol; fully mix the above reactants to obtain a reaction solution;

[0046] 4) Weigh ascorbic acid, add distilled water, prepare an aqueous solution of ascorbic acid with a molar concentration of 0.2M, and add 0.5 mL to the reaction solution in step 3); gently shake the round-bottomed flask to mix the reaction solution uniformly, then keep it at 30°C Set the reaction for 9h to prepare the reaction mixture;

[0047] 5) Centrifuge the reaction mixture obtained in step 4), discard the supernatant l...

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Abstract

The invention relates to a preparation method and application of an Au-Pd core-shell structure super-long nanowire in a water phase, a certain amount of 1-hexadecyl-3-methylimidazolium chloride ionic liquid aqueous solution is taken and added into a round-bottom flask, and HAuCl4, Na2PdCl4 and KBr are sequentially added into the round-bottom flask; uniformly mixing the reactants to obtain a reaction solution; adding a reducing agent with a certain concentration into the reaction solution, uniformly mixing, and standing and reacting at 30 DEG C for 8-10 hours to obtain a reaction mixture; and carrying out centrifugal separation on the reaction mixture, taking the lower layer precipitate, carrying out centrifugal washing, and carrying out vacuum drying to obtain a product, namely the Au-coated Pd core-shell structure super-long nanowire. The ionic liquid and KBr are adopted to jointly regulate and control the morphology, the structure and the catalytic performance of the product, and the reaction is non-toxic and relatively green. The prepared Au-coated Pd is an ultra-long nanowire with a core-shell structure, and has very high catalytic activity and selectivity for converting p-hydroxybenzyl alcohol into p-hydroxybenzaldehyde through catalytic oxidation.

Description

technical field [0001] The invention relates to the technical field of preparation of bimetallic nanomaterials, in particular to a preparation method and application of ultra-long nanowires with Au@Pd core-shell structure in an aqueous phase. Au@Pd is prepared in an aqueous solution under mild conditions through the assistance of ionic liquids core-shell structure ultralong nanowires and their application in catalytic oxidation of p-hydroxybenzyl alcohol. Background technique [0002] Compared with other bimetallic nanomaterials, Au-Pd bimetallic nanomaterials have more extensive applications due to their higher activity. For example, Au-Pd catalyst has been used in the industrial synthesis of vinyl acetate. In the United States alone, 4.8 million tons of vinyl acetate are synthesized under the catalysis of Au-Pd every year. Au-Pd nanomaterials are also widely used in surface-enhanced Raman scattering, CO low-temperature oxidation, 2 and O 2 direct synthesis of H 2 O 2 ...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/00B01J35/02B01J37/00B01J37/16C07C45/38C07C47/565
CPCB01J23/52B01J37/0018B01J37/16C07C45/38B01J35/396B01J35/50B01J35/40C07C47/565Y02P20/54
Inventor 姚开胜李慧慧王键吉卢伟伟赵晨晨
Owner HENAN UNIV OF SCI & TECH
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