Stratiform bimetal hydroxide for growing carbon nano-fibers and preparation method thereof

A layered bimetallic and carbon nanofiber technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, fiber chemical characteristics, chemical instruments and methods, etc., can solve the difficult-to-control and easy-to-aggregate particle size of metal particles , high preparation cost and other issues, to achieve the effect of simple operation, uniform distribution of active components and saving production cost

Inactive Publication Date: 2011-05-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a layered double metal hydroxide for carbon nanofiber growth and a preparation method thereof, which overcomes the shortcomings of traditional metal catal

Method used

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  • Stratiform bimetal hydroxide for growing carbon nano-fibers and preparation method thereof
  • Stratiform bimetal hydroxide for growing carbon nano-fibers and preparation method thereof
  • Stratiform bimetal hydroxide for growing carbon nano-fibers and preparation method thereof

Examples

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Embodiment 1

[0024] Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and H 2 PtCl 6 ·6H 2 O was dissolved in 100ml deionized water to prepare a salt solution and put it into a three-necked flask, Mg 2+ The molar concentration of Al is 0.75mol / L, Al 3+ The molar concentration is 0.25mol / L, PtCl 6 2- 0.03mol / L; then configure a certain proportion of NaOH and Na 2 CO 3 Dissolve in 100ml deionized water to prepare mixed alkali solution, wherein the molar concentration of NaOH is 1.6mol / L, NaOH 2 CO 3 The molar concentration is 0.5mol / L. Under the condition of constant stirring at room temperature, the above alkaline solution was slowly added dropwise to the mixed salt solution until the final pH of the solution was 9, and then transferred to a 60° C. water bath for 12 hours of crystallization reaction. After the reaction, the product was cooled to room temperature, centrifuged and washed with deionized water until the filtrate was neutral, and finally dried in an oven at 60°C for 24 hour...

Embodiment 2

[0027] Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and H 2 PtCl 6 ·6H 2 O was dissolved in 100ml deionized water to prepare a salt solution and put it into a three-necked flask, Mg 2+ The molar concentration is 0.5mol / L, Al 3+ The molar concentration is 0.25mol / L, PtCl 6 2- 0.1mol / L; reconfigure a certain proportion of NaOH and Na 2 CO 3 Dissolve in 100ml deionized water to prepare mixed alkaline solution, wherein the molar concentration of NaOH is 1.2mol / L, NaOH 2 CO 3 The molar concentration is 0.5mol / L. Under the condition of constant stirring at room temperature, the above alkaline solution was slowly added dropwise to the mixed salt solution until the final pH of the solution was 9, and then transferred to a water bath at 60° C. for crystallization reaction for 24 hours. After the reaction, the product was cooled to room temperature, centrifuged and washed with deionized water until the filtrate was neutral, and finally dried in an oven at 60°C for 24 hours to ...

Embodiment 3

[0030] MgCl 2 ·6H 2 O, AlCl 3 ·6H 2 O and K 2 PtCl 6 Dissolved in 100ml deionized water to prepare a salt solution and put it into a three-necked flask, Mg 2+ The molar concentration of Al is 0.75mol / L, Al 3+ The molar concentration is 0.25mol / L, PtCl 6 2- 0.075mol / L, and then prepare 100ml of NaOH solution with a molar concentration of 1.6mol / L. Constant stirring at room temperature and N 2 Under protected conditions, the above alkaline solution was slowly added dropwise to the mixed salt solution until the final pH of the solution was 10, and then transferred to a water bath at 80° C. for 12 hours of crystallization reaction. After the reaction, the product was cooled to room temperature, centrifuged and washed with deionized water until the filtrate was neutral, and finally dried in an oven at 70°C for 24 hours to obtain the corresponding catalyst precursor. The above precursor samples were placed in a muffle furnace at a rate of 5 °C / min to 700 °C for 1 h to obta...

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Abstract

The invention discloses a stratiform bimetal hydroxide for growing carbon nano-fibers and a preparation method of the stratiform bimetal hydroxide, which belong to the technical field of preparation of nano materials. PtCl62 is introduced into layers of the stratiform bimetal hydroxide by adopting a co-precipitation method, a composite metal oxide loaded high-dispersion Pt-based catalyst is prepared by baking, and an acetylene gas is cracked by a chemical vapor deposition method to catalyze and grow a carbon nano-fiber material. In the method, a hydrogen in situ reduction Pt species generated by acetylene decomposition is used for obtain high-dispersion Pt nano-particles with the particle size of 6 to 40 nm, and then the Pt nano-particles are used for adsorbing the carbon generated by acetylene cracking, so the carbon nano-fiber material of which the diameter is 15 to 80 nm and the length is 1.2 to 6 mum can be grown. The stratiform bimetal hydroxide and the preparation method have the advantages of overcoming the defects of the conventional metal catalyst that the preparation cost is high, agglomeration is easily generated among metal particles and the particle size is difficult to control, and greatly saving the production cost and reducing environmental pollutions by using acetylene as a reducing gas and a carbon source to grow the carbon nano-fibers.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a layered double metal hydroxide for growing carbon nanofibers and a preparation method thereof. technical background [0002] Carbon fiber is a very important class of carbon materials. Nano-scale carbon fiber (CNF for short) has many superior properties, such as high thermal conductivity, electrical conductivity, strong mechanical properties and compact structure. These unique properties make carbon nanofibers have good application prospects in composite materials, catalyst supports, hydrogen storage materials, sensors, fuel cell electrodes, and electromagnetic shielding materials. [0003] Chemical vapor deposition (CCVD) is the most widely used method for preparing carbon nanofibers. This method is simple and easy to control, has low equipment cost, and is convenient for large-scale industrial production. Catalyst is an important factor in the s...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/60D01F9/127
Inventor 李峰陈其隆
Owner BEIJING UNIV OF CHEM TECH
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