METHOD FOR PRODUCING AN EFFICIENT CATALYST FOR GENERATING MULTI-WALLED CARBON NANOTUBES, MULTI-WALLED CARBON NANOTUBES AND CARBON NANOTUBE
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Abstract
The invention relates to a method for producing a catalyst for the synthesis of multi-walled carbon nanotubes. The invention also relates to a method for producing multi-walled carbon nanotubes and a carbon nanotube powder with improved properties and comprising said carbon nanotubes.
6 Citations
38 Claims
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1-19. -19. (canceled)
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20. A process for producing a catalyst consisting of at least one or more active metals and one or more support materials, which comprises the steps:
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a) initial charging of a substrate in powder form which serves as support material for the catalyst and dispersion of the substrate powder in a solvent by mechanical action and setting of the dispersion to a pH of at least 8, b) addition of one or more metal salt solutions containing precursor compounds of catalytically active metals and support metals, optionally after resetting of the selected pH so that these are coprecipitated and at the same time deposited on the previously dispersed substrate powder, c) removal and isolation of the precipitated solid, d) optionally washing of the solid with solvent, e) spray-drying or drying and optionally milling and/or sieving (classification), f) optionally calcining at 200°
C.-950°
C., with reduction or oxidation with subsequent reduction, andg) reduction of the catalyst material formed. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification