Carbon nanotube and hydrogen production system and method with autocatalysis function

Abstract

The invention discloses a carbon nanotube and hydrogen production system and method with autocatalysis function. The production system includes a quartz sand feeding device, a moving bed reactor, a heat exchanger, an ultrasonic separation device, a carbon nanotube purification device, a methane gas cylinder and a hydrogen storage tank. The moving bed reactor is adopted, cheap and easily availablemethane gas is taken as the carbon source, natural quartz sand is used as an unconventional catalyst for catalytic cracking to produce carbon nanotubes and high purity hydrogen at the same time, alsothe carbon nanotubes loaded on the surface of natural quartz sand are separated and purified, quartz sand does not inactivate in the reaction process as an unconventional catalyst, and shows increasingly high catalytic efficiency with the proceeding of the reaction, and catalyzes methane cracking to rapidly produce carbon nanotubes with large length-diameter ratio, controllable length and high geometric dimension consistency at low cost. The reaction by-product is high purity hydrogen, which can be used as a high value-added raw material of downstream industry, thus further improving the economical efficiency of the whole system.

Description

technical field [0001] The invention relates to the technical field of carbon nanotube preparation, in particular to a carbon nanotube and hydrogen production system and method with self-catalysis function. Background technique [0002] Carbon nanotubes (CNTs for short) are nanomaterials composed of carbon atoms with a layered hollow structure. , optical equipment, structural materials and many other aspects have application value. Carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes according to the number of layers that make up the walls of carbon nanotubes. [0003] At present, the commonly used carbon nanotube preparation methods mainly include: arc discharge method, laser ablation evaporation method, plasma method, chemical vapor deposition method (CVD method), etc., among which CVD method is the most common method for preparing carbon nanotubes. In the CVD method, the substrate is first heated to 700°C, and then the ca...

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Problems solved by technology

[0004] At present, the CVD method mainly faces the following technical problems: (1) In order for the reaction to occur, it is necessary to prepare expensive catalysts or carbon-based precursors, resulting in high production costs; (2) The production process is relatively slow and inefficient, and it is difficult to achieve carbon The rapid and mass production of nanotubes is not conducive to the large-scale industrial application of carbon nanotubes; (3) the produced carbon nanotubes have many structural defects, poor consistency, and insufficient length, which severely limits the use of carbon nanotubes; (4) catalysts It is easy to inactivate and difficult to regenerate, so it cannot be produced continuously

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