Method for preparing TiC-TiO2 core-shell type nanometer material

A nanomaterial, core-shell technology, applied in chemical instruments and methods, electrical components, circuits, etc., can solve the problems of high cost, long process, complex process, etc., achieve stable quality, reduce load, and increase catalytic surface area Effect

Inactive Publication Date: 2014-02-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The present invention aims at the disadvantages of complex process, long process and high cost for the above-mentioned preparation of core-shell nanomaterials, and proposes to use oxidizable nano-powder TiC as the reaction raw material, adopt partial oxidation, and control the oxidation degree of the reaction raw material to carry out the surface treatment. Phase and microporous structure modification to prepare TiC / TiO with porous structure and high specific surface area 2 In situ composites of core-shell nanopowders, which can be used as supports for fuel cell electrocatalysts

Method used

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  • Method for preparing TiC-TiO2 core-shell type nanometer material
  • Method for preparing TiC-TiO2 core-shell type nanometer material
  • Method for preparing TiC-TiO2 core-shell type nanometer material

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Effect test

Embodiment 1

[0043] 1) Ingredients: uniformly mix an appropriate amount of TiC nanoparticles (produced by Aldrich, particle size 20-100nm) and potassium carbonate powder of the same quality, and then put it into the reactor; the oxidant is air.

[0044] 2) Reaction conditions: the fluidized bed reactor adopts a quartz glass tube with an outer diameter of 14mm, an inner diameter of 10mm, and a length of 30mm; the pressure of air and nitrogen is adjusted to 0.03MPa, the flow rate of air is 100ml / min, and the flow rate of nitrogen is 200ml / min min; the reaction time is 3 min, and the reaction temperatures are controlled at 610°C, 650°C and 690°C, respectively.

[0045] 3) Heating up: Before the reaction, pass nitrogen gas, discharge the air in the pipe, close the air valve, use the temperature control system to control the reaction temperature, and use a thermocouple to monitor the temperature of the gas at the outlet of the reactor.

[0046] 4) Reaction: When the temperature rises to the pre...

Embodiment 2

[0056] 1) Ingredients: uniformly mix an appropriate amount of TiC nanoparticles and sodium bicarbonate powder of the same quality, and then put them into the reactor.

[0057] 2) Reaction conditions: The fluidized bed reactor adopts a quartz glass tube with an outer diameter of 14mm, an inner diameter of 10mm, and a length of 30mm; the pressure of air and nitrogen is adjusted to 0.03MPa, the reaction time is 3min, and the reaction temperature is 610°C. The flow rate ratio is 100ml / min: 200ml / min and 100ml / min: 400ml / min;

[0058] 3) Heating: Before the reaction, pass nitrogen gas to discharge the air in the reactor, close the air valve, use the temperature control system to control the reaction temperature, and use an external thermocouple to monitor the temperature in the reactor.

[0059] 4) Reaction: When the temperature rises to 610°C, air is introduced, and the reaction time is 3 minutes. After the reaction is completed, the air valve is closed, and nitrogen gas is contin...

Embodiment 3

[0063] 1) Ingredients: uniformly mix appropriate amount of TiC nanoparticles and potassium carbonate powder of the same quality, and then put them into the reactor.

[0064] 2) Reaction conditions: The fluidized bed reactor adopts a quartz glass tube with a straight outer diameter of 14mm, an inner diameter of 10mm, and a length of 30mm; the pressure of air and nitrogen is adjusted to 0.03MPa, the flow rate of air is 100ml / min, and the flow rate of nitrogen The reaction temperature is 200ml / min; the reaction temperature is 610°C, and the reaction time is 3min, 4min, 5min.

[0065] 3) Heating up: Before the reaction, pass nitrogen gas, discharge the air in the pipe, close the air valve, use the temperature control system to control the reaction temperature, and use a thermocouple to monitor the temperature of the gas at the outlet of the reactor.

[0066] 4) Reaction: When the temperature rises to 610°C, air is introduced, and the reaction time is 3 minutes. After the reaction ...

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Abstract

The invention discloses a method for preparing a TiC-TiO2 core-shell type nanometer material. The method comprises the following steps of: taking TiC nanometer grains as a precursor of a core-shell type nanometer material to be prepared; mixing the precursor with a dispersed material which is easily solved in a solvent in which the prepared nanometer grains cannot be solved; and preparing the core-shell type nanometer material compounds with different element proportion contents by controlling a reaction condition. The core-shell type nanometer material prepared according to the method provided by the invention is excellent in reproducibility; the process is simple and is easily controlled; and a noble metal catalyst can be loaded on the core-shell type nanometer material with excellent conductivity and oxidation corrosion resistance, so that the loaded capacity of the noble metal catalyst is reduced and the use ratio of the catalyst is increased.

Description

technical field [0001] The invention relates to the field of preparation of nanomaterials, in particular to a method for preparing core-shell nanomaterials using a fluidized bed. Background technique [0002] After years of development, nanomaterials have initially entered the stage of practical application. The most important parameters of solid particles are particle size and chemical composition, but particle structure (eg crystallinity), especially surface structure, is in many cases more important. Changing the particle surface structure and composition can greatly improve the performance of the particle, and sometimes even change the original performance or produce new characteristics. Designing and synthesizing ordered nanocomposite particles with controllable structures has become a research hotspot. [0003] In order to obtain nanocomposite particles with good structure and composition and meet the requirements of nanotechnology in the synthesis and industrial pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J35/10H01M4/90
CPCY02E60/50
Inventor 隋升曾亚平王山领
Owner SHANGHAI JIAO TONG UNIV
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