Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing carbon nanotubes by using semicoke-based catalyst prepared by micro-fluidized bed

A carbon nanotube, microfluidization technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of limited contact strength, unstable impregnation effect, long impregnation time, etc. Development and practical value, optimizing the effect of the impregnation process

Active Publication Date: 2021-10-29
QINGDAO UNIV OF SCI & TECH
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited contact strength between the active component solution and the carrier particles, the impregnation time is long and the impregnation effect is unstable.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing carbon nanotubes by using semicoke-based catalyst prepared by micro-fluidized bed
  • Method for producing carbon nanotubes by using semicoke-based catalyst prepared by micro-fluidized bed
  • Method for producing carbon nanotubes by using semicoke-based catalyst prepared by micro-fluidized bed

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] (3) Catalyst preparation: use a catalytically active metal soluble salt solution as the impregnating solution, take an appropriate amount of pretreated semi-coke powder and send it into the microfluidized bed reactor, and use a solution pump to continuously pump the impregnating solution into the microfluidized bed reactor. In the bed reactor, the impregnating solution and the semi-coke powder are fully mixed in the microfluidized bed reactor for 2.5-5 hours, then the mixed solution is exported and filtered, and the semi-coke powder is collected for washing, drying and baking to obtain the semi-coke catalyst, metal The soluble salt solution is one or more of iron, cobalt, nickel, manganese, aluminum, copper, magnesium, platinum nitrate or sulfate, and the solvent mass fraction of the metal soluble salt solution is 12%-25%. The liquid mass ratio is 1: (12-25), the temperature is maintained at 20-60°C during the impregnation process, the drying temperature is 105-120°C, an...

Embodiment 1

[0033] The invention provides a method for producing carbon nanotubes using a semi-coke-based catalyst prepared by a microfluidized bed, comprising the following steps:

[0034] (1) Take a certain mass of granular coal with a diameter of 1-2cm and place it in a fixed-bed pyrolysis furnace, heat the temperature in the fixed-bed pyrolysis furnace to 550°C at a heating rate of 15°C / min and keep it for 100min to complete the heating process. solution, collect the generated coal semi-coke particles after cooling to room temperature;

[0035](2) Grind and sieve coal semi-coke particles to obtain powdered semi-coke with an average particle size of 80 μm, wash with hydrochloric acid or nitric acid solution with a solute mass fraction of 15%, and then wash with deionized water several times until Neutral, put it in a drying oven with a temperature set at 120°C for drying;

[0036] (3) Catalyst preparation process such as figure 1 As shown, the configured ferric nitrate solution with ...

Embodiment 2

[0039] The invention provides a method for producing carbon nanotubes using a semi-coke-based catalyst prepared by a microfluidized bed, comprising the following steps:

[0040] (1) Take a certain mass of granular coal with a diameter of 1-2cm and place it in a fixed bed pyrolysis furnace, heat the temperature in the furnace to 550°C at a heating rate of 15°C / min and keep it for 100min to complete the pyrolysis, and wait to cool to Collect the generated coal semi-coke particles after room temperature;

[0041] (2) Grind and sieve coal semi-coke particles to obtain powdered semi-coke with an average particle size of 80 μm, wash with hydrochloric acid or nitric acid solution with a solute mass fraction of 15%, and then wash with deionized water several times until Neutral, put it in a drying oven with a temperature set at 120°C for drying;

[0042] (3) Catalyst preparation process such as figure 2 As shown, in this embodiment, double (multiple) circulation parallel loops are ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for producing carbon nanotubes by using a semicoke-based catalyst prepared by a micro-fluidized bed. The method comprises the following steps: pyrolyzing pea coal in a pyrolyzing furnace; grinding and screening the coal semicoke particles to obtain powdery semicoke, washing the powdery semicoke with a hydrochloric acid or nitric acid solution, cleaning the powdery semicoke with deionized water, and drying the powdery semicoke to obtain semicoke powder for later use; feeding a proper amount of semicoke powder into a micro-fluidized bed reactor, continuously pumping the dipping solution into the micro-fluidized bed reactor, fully mixing, collecting the semicoke powder, washing, drying and baking; and activating the prepared semi-coke catalyst, putting the activated semi-coke catalyst into a fluidized bed reactor, introducing methane gas, and collecting the obtained carbon nanotubes. The coal pyrolysis semi-coke is adopted as a carrier, the catalyst is prepared by virtue of the micro-fluidized bed reactor, then the prepared catalyst is applied to the process of producing the carbon nanotube by taking greenhouse gas methane as a raw material, and the carbon nanotube material with a high additional value is produced while low-value semi-coke and greenhouse gas are effectively utilized.

Description

technical field [0001] The invention relates to the technical field of carbon material preparation, in particular to a method for producing carbon nanotubes using a semi-coke-based catalyst prepared by a microfluidized bed. Background technique [0002] As a new type of carbon material, carbon nanotubes have excellent mechanical, thermal and electrical properties, and have great application prospects in current technological frontier fields such as high thermal conductivity materials and new energy vehicles. In the process of producing carbon nanotubes by the commonly used chemical vapor deposition method, on the one hand, the choice of carbon source has an important impact on the production of carbon nanotubes. Carbon nanotubes have good prospects; on the other hand, catalysts play a key role. Currently, most of the commonly used catalysts for the preparation of carbon nanotubes are metal oxides such as Al 2 o 3 Or ore such as dolomite is used as a carrier, the type is re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/162
CPCC01B32/162
Inventor 吴龚鹏何燕张江辉
Owner QINGDAO UNIV OF SCI & TECH