99results about How to "Save template" patented technology

The invention belongs to the technical field of preparation of carbon nanotubes, and provides a preparation and purification method of a coal-based carbon nanotubes. The method comprises the followingsteps: taking coal as a base, mixing potassium chloride and potassium iodide to obtain a catalyst, uniformly mixing the coal and the catalyst, paving an obtained mixture in a reactor, introducing generated gas A, and performing microwave heating to obtain coal-based carbon nanotubes on the surface of the coal; cooling the coal-based carbon nanotubes to 400 DEG C, introducing purified gas B for purification, and when the temperature of the coal-based carbon nanotubes is higher than 550 DEG C, stopping introducing the purified gas B and introducing nitrogen for cooling to 400 DEG C; repeating the process used for generating and purifying the coal-based carbon nanotubes, and repairing and prolonging the carbon nanotubes until the mass fraction of the coal is below 30%; and washing with an acid, washing with distilled water, and heating at 60-90 DEG C to remove water, thereby obtaining the pure coal-based carbon nanotubes. According to the preparation and purification method, a large number of coal-based carbon nanotubes are prepared on taking coal as the base, so that coal-based templates are reduced, and the purity of the coal-based carbon nanotubes is improved as much as possible.The technology and the purification process for preparing the carbon nanotubes from the coal base are perfected, so that the coal-based carbon nanotubes has more economic advantages and product advantages.