A system and method for the controlled gasification preparation of single-walled carbon nanotubes using a metal catalyst.

By combining electromagnetic induction heating and microwave plasma gasification technology with reactor temperature control zones, controllable gasification of metal catalysts has been achieved, solving the problems of uncontrolled catalyst particle size and impurity introduction in existing technologies. This improves the preparation efficiency and purity of carbon nanotubes and is suitable for large-scale production.

CN122079138APending Publication Date: 2026-05-26NINGBO XENWO NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO XENWO NEW MATERIAL TECH CO LTD
Filing Date
2026-03-13
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing single-walled carbon nanotube vapor deposition technology cannot achieve continuous, quantitative, and atomic-level vaporization of metal catalysts in a pure, stable, and macroscopically uniform thermal environment, leading to uncontrolled catalyst particle size and the introduction of impurities, which affects the preparation efficiency and product purity of carbon nanotubes.

Method used

A uniform molten metal is formed by heating a metal block with an electromagnetic induction coil. The temperature is monitored in real time and controlled in a closed loop. A nozzle outputs a stable liquid flow. Combined with a microwave plasma gasification unit and a reactor temperature control zone, a continuous and stable gaseous catalyst flow of molten metal is achieved. The flow is dynamically adjusted by a control unit to ensure the matching of the gaseous catalyst and the carbon source reaction, thereby achieving selective growth of carbon nanotubes.

Benefits of technology

This method achieves uniformity in metal particle size and uniform distribution of gas-phase catalyst, improves the crystallinity and single-wall ratio of carbon nanotubes, reduces metal impurity content, ensures product purity and production reliability, and is suitable for large-scale continuous preparation.

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Abstract

This invention discloses a system and method for the controllable gasification of metal catalysts to prepare single-walled carbon nanotubes, relating to the field of nanomaterial preparation technology. The method includes S1, uniformly heating a metal block in a crucible using an electromagnetic induction coil to melt it into a molten metal, and using a real-time temperature sensor to monitor the status of a cooling device to achieve closed-loop precise control of the melting temperature, ensuring uniform and stable cooling. This invention can precisely control metal gasification through microwave plasma, achieving a high degree of consistency in gasification rate, metal particle size, and distribution, thereby providing a continuous, stable, and uniform gas-phase catalyst flow, significantly improving the crystallinity and single-wall ratio of carbon nanotubes, while effectively reducing the metal impurity content in the product. By decoupling the metal melting and gasification processes, efficient and uniform gasification can be achieved at lower temperatures, avoiding metal particle aggregation and excessively large particle size caused by localized excessively high temperatures, ensuring uniform distribution of the catalyst in the gas phase.
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