Method for preparing high-purity hydrogen by using microwave effect of waste plastic self-derived carbon nanotubes

By using a microwave heating method with self-derived carbon nanotubes supporting multi-component nano-metal particle catalysts, the problems of low yield and low purity in hydrogen production from waste plastics have been solved, achieving efficient and economical hydrogen generation. The catalyst can be recycled, thus improving hydrogen yield and purity.

CN119569042BActive Publication Date: 2026-07-24TSINGHUA UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIVERSITY
Filing Date
2024-12-03
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies for producing hydrogen from waste plastics based on microwave pyrolysis suffer from low yield and low purity, making it difficult to achieve efficient and economical hydrogen production.

Method used

A multi-component nano-metal particle catalyst supported on self-derived carbon nanotubes was used. Waste plastic was heated by microwave, and Ni, Al and Fe catalysts were combined to form a localized heating zone to promote molecular motion and heat transfer, generating high-purity hydrogen. The carbon nanotubes were recycled as the support for the multi-component nano-metal catalyst.

Benefits of technology

It significantly increases hydrogen production by more than 20%, with a purity of over 90 vol%. The catalyst can be recycled ten times, exhibiting high economic value and catalytic activity.

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Abstract

The present application relates to the technical field of solid waste treatment, and provides a method for preparing high-purity hydrogen by using waste plastic self-derived carbon nanotubes, which comprises the following steps: S1, mixing plastic and multi-element nanometer metal catalyst, adding microwave absorber to obtain a mixture, wherein the multi-element nanometer metal catalyst comprises Ni, Al and Fe; S2, microwave heating the mixture in inert gas to obtain hydrogen and self-derived carbon nanotubes; S3, reloading the self-derived carbon nanotubes with the multi-element nanometer metal catalyst, adding in step S1, and microwave heating reaction in step S2 to obtain high-purity hydrogen. The method for preparing hydrogen by using waste plastic self-derived carbon nanotubes can further improve the hydrogen yield by more than 20%, and the hydrogen yield reaches 62.55 mmol / g, and the hydrogen purity is greater than 90 vol%.
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