Method for preparing one-dimensional cuprous oxide/carbon nanocomposite catalyst and application

A carbon nanocomposite, cuprous oxide technology, applied in catalyst activation/preparation, organic compound preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as difficult control and high cost, and achieve crystallization The effect of high density, uniform particle distribution and excellent catalytic performance

Active Publication Date: 2019-08-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing synthetic methods often require additional carriers, templates, and reducing agents, and the composition, structure, and dispersion are difficult to control at the same time as the cost is high. Therefore, new methods are developed to prepare high-quality Cu with high catalytic activity. 2 O / C nanocomposite catalyst has important practical significance

Method used

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  • Method for preparing one-dimensional cuprous oxide/carbon nanocomposite catalyst and application
  • Method for preparing one-dimensional cuprous oxide/carbon nanocomposite catalyst and application
  • Method for preparing one-dimensional cuprous oxide/carbon nanocomposite catalyst and application

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Experimental program
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Effect test

Embodiment 1

[0028] 1) Make 100mL concentration 0.2mol L -1 The copper nitrate aqueous solution with 150mL concentration is 0.15mol L -1 The sodium salicylate solution was mixed evenly, and after stirring, slowly added 0.5mol·L -1 After adjusting the pH of the system to 7, react in a nitrogen atmosphere at 90°C for 36 hours. The product is centrifuged, washed and dried to obtain a one-dimensional salicylate intercalated layered copper hydroxide precursor. The scanning electron microscope photo is shown in figure 1 ;

[0029] 2) After the precursor prepared in the above steps was calcined at 400° C. for 30 min in a nitrogen atmosphere, a one-dimensional Cu / C nanocomposite material was obtained.

[0030] 3) The one-dimensional Cu / C nanocomposite material prepared in step 2) was placed in an oxygen atmosphere and calcined at 100°C for 30 minutes to obtain a cuprous oxide / carbon nanocomposite catalyst, denoted as catalyst Cu 2 O / C-1, the schematic diagram of the preparation process is shown...

Embodiment 2

[0033] 1) Make 100mL concentration 0.2mol L -1 The cupric chloride solution with 150mL concentration is 0.26mol L -1 The aqueous solution of sodium salicylate was evenly mixed, and after stirring, slowly added 0.5mol·L -1 After adjusting the pH of the system to 6.5, react in an argon atmosphere at 80°C for 48 hours, the product is centrifuged, washed and dried to obtain a one-dimensional salicylate intercalated layered copper hydroxide precursor;

[0034] 2) After the precursor prepared in the above steps was calcined at 600° C. for 5 min in a nitrogen atmosphere, a one-dimensional Cu / C nanocomposite material was obtained.

[0035] 3) The nanocomposite prepared in step 2) is placed in an oxygen atmosphere and roasted at 200°C for 0 min to obtain a cuprous oxide / carbon nanocomposite, denoted as catalyst Cu 2 O / C-2, see the characterization results Figure 3-6 .

[0036] The liquid-phase hydrogenation reaction process of p-nitrophenol is as follows: add 2.5mmol L to the quar...

Embodiment 3

[0038] 1) Make 100mL concentration 0.2mol L -1 The concentration of copper sulfate aqueous solution and 150mL is 0.37mol L -1 Potassium salicylate aqueous solution is evenly mixed, after stirring, slowly add 1mol L -1 NaOH aqueous solution, after adjusting the pH of the system to 5.5, reacted in a nitrogen atmosphere at 70°C for 12 hours, and the product was centrifuged, washed and dried to obtain a one-dimensional salicylate intercalated layered copper hydroxide precursor;

[0039] 2) After the precursor prepared in the above steps was calcined at 800° C. for 120 min in an argon atmosphere, a one-dimensional Cu / C nanocomposite material was obtained.

[0040] 3) The nanocomposite prepared in step 2) is placed in an oxygen atmosphere at 300° C. for 5 minutes to obtain a cuprous oxide / carbon nanocomposite, denoted as catalyst Cu 2 O / C-3.

[0041] The liquid-phase hydrogenation reaction process of p-nitrophenol is as follows: add 2.5mmol L to the quartz cuvette in advance -1 ...

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Abstract

The invention discloses a method for preparing a one-dimensional cuprous oxide / carbon nanocomposite catalyst and application. The method disclosed by the invention comprises the following steps: by utilizing an intercalation assembly of salicylate and metal ions, preparing salicylate intercalation layered copper hydroxide having one-dimensional morphology; carrying out solid-state pyrolysis and low-temperature oxidation two-step solid-phase reactions, thereby obtaining the one-dimensional cuprous oxide / carbon nanocomposite catalyst. According to the method disclosed by the invention, cheap water soluble salts serve as reactants, any organic solvent, surfactant, extra carrier, template agent or reducing agent is not needed in the preparation process, the prepared catalyst particle is uniform in distribution, high in purity and high in crystallinity, and the Cu nanoparticles form Cu2O having a hollow structure by utilizing a Kirkendall effect. The catalyst synthesized in the invention has excellent catalytic performance and excellent cycling stability in a liquid phase hydrogenation reaction of p-nitrophenol.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a one-dimensional Cu 2 O / C nano catalyst and its preparation method and application in p-nitrophenol hydrogenation reaction. Background technique [0002] Cuprous oxide (Cu 2 O) is an important functional material, and has the characteristics of non-toxicity, low preparation cost, and good environmental tolerance. It has broad application prospects in catalysis, biocides, gas sensors, solar photovoltaics, and lithium-ion batteries. Carbon nanomaterials are considered to be good catalyst supports because of their large surface area, high electrical conductivity, and high mechanical strength. Loading cuprous oxide on the surface of carbon nanomaterials can improve the dispersion of metal particles. At the same time, because the electronic structure characteristics of carbon nanomaterials can promote electron transfer during the catalytic reaction process, it is condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J35/10B01J37/03B01J37/08B82Y30/00B82Y40/00C07C213/02C07C215/76
CPCB01J23/72B01J35/1014B01J35/1019B01J35/1061B01J37/03B01J37/082B82Y30/00B82Y40/00C07C213/02C07C215/76
Inventor 王连英栗冰冰张强刘志静王翠莲程若辉
Owner BEIJING UNIV OF CHEM TECH
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