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Au/Co(OH)2 nano-array structured catalyst

A structured catalyst and nano-array technology, which is applied in the field of catalysis, can solve the problems of less research work on nano-array structured catalysts, restrictions on the industrial development and application of high-performance catalysts, and uneven distribution of catalyst active components, so as to achieve good electron transport performance, meeting environmental protection and sustainable development, and the effect of excellent catalytic performance

Active Publication Date: 2014-12-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But so far, there is still little research work on the application of nanoarrays to structured catalysts, which limits the industrial development and application of high-performance catalysts to a certain extent.
Based on this, we propose based on Co(OH) 2 Synthesis of Au / Co(OH) with Nanoarray as Support 2 Nano-array structured catalyst, the formed nano-structure is definite and orderly, can achieve high specific surface area, solve the problem of uneven distribution of active components of traditional overall catalysts, and weak adhesion to the carrier

Method used

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Embodiment 1

[0026] a. Divide 8cm 2 The foamed nickel substrate was ultrasonically cleaned with hydrochloric acid for 5 minutes, then ultrasonically cleaned with absolute ethanol for 5 minutes, and then cleaned with deionized water to obtain a foamed nickel substrate for subsequent use;

[0027] b. Dissolve 0.5820g of cobalt nitrate hexahydrate, 0.2963g of ammonium fluoride and 0.6000g of urea in 40mL of deionized water, stir evenly, and put it into a hydrothermal kettle;

[0028] c. Immerse the foamed nickel substrate obtained in step a into the mixed solution obtained in step b, and heat it in a reactor at 120° C. for 12 hours, and cool it to room temperature naturally after the reaction; the obtained substrate is washed with water and absolute ethanol to remove impurities. Dry in an oven at ℃ for 2 hours;

[0029] d. Soluble cobalt salt and urea are dissolved in deionized water to form a solution, wherein the concentration of cobalt ions is 0.025mol / L, the addition is 0.296g, and the sub...

Embodiment 2

[0036] a. Divide 8cm 2 The foamed nickel substrate was ultrasonically cleaned with hydrochloric acid (1mol / L) for 5 minutes, then ultrasonically cleaned with absolute ethanol for 5 minutes, and then cleaned with deionized water to obtain an iron substrate for subsequent use;

[0037] b. Dissolve 1.164g of cobalt nitrate hexahydrate and 0.56g of hexamethylenetetramine in 40mL of deionized water, stir evenly, and put it into a hydrothermal kettle;

[0038] c. Immerse the foamed nickel substrate obtained in step a into the mixed solution obtained in step b, and heat it with water at 100°C for 10 hours in a reaction kettle, and cool it to room temperature naturally after the reaction; the obtained substrate is washed with water and absolute ethanol to remove impurities. Dry in an oven at ℃ for 2 hours;

[0039] d. The substrate obtained in step c is deposited and precipitated using NaBH 4 In situ reduction of 200 μL chloroauric acid to obtain Au / Co(Oh) 2 Nanoarray Structured Ca...

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Abstract

Belonging to the technical field of catalysis, the invention relates to an Au / Co(OH)2 nano-array structured catalyst. A rectangular flaky nano-array directly grows on a foamed nickel substrate, and the formed nano-material has a determined and ordered structure, and can realize a high specific surface area. The micron pieces on the foamed nickel substrate are connected with the macroscopic scale substrate and of nanoscale noble metal particles, thus ensuring enough adhesion and avoiding leaching in catalytic reaction. The average size of a single square nano-sheet is 1.5-micrometer wide, and the size of gold particles is 3-5nm. The catalyst can be effectively used for hydrogenation reduction reaction of p-nitrophenol, and the reaction rate is 30.8s<-1>g<-1>. The Au / Co(OH)2 nano-array structured catalyst also has excellent cycling stability, basically has no appearance change after 6 cycles of use, and more importantly, generally maintains unchanged catalytic performance. The problems of nonuniform active component distribution, weak cohesiveness with the carrier and gradual decrease of activity during reaction in traditional monolithic catalysts are solved.

Description

technical field [0001] The invention belongs to the technical field of catalysis, in particular to Au / Co(OH) with ordered structure and uniform size distribution grown on a nickel foam substrate 2 Nano-array structured catalyst and preparation method thereof. Background technique [0002] With the rapid development of the national economy, China is facing the dual pressure of resource scarcity and environmental degradation, and the effective use of resources has become an urgent national major demand. Catalyst is a key step in industrial production, its research and development and application are closely related to all aspects of energy and chemical industry. Catalysts are divided into homogeneous catalysts and heterogeneous catalysts according to the phase state of the reaction system. In the current industrial application field, heterogeneous catalysts are mostly used. Heterogeneous catalysts, also known as heterogeneous catalysts, are used in catalytic reactions in dif...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C213/02C07C215/76
Inventor 刘军枫翁习文孙晓明
Owner BEIJING UNIV OF CHEM TECH
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