Catalysts for the large scale production of high purity...

B - Operations – Transporting – 01 – J

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B01J 23/88 (2006.01) B01J 37/03 (2006.01) C01B 31/02 (2006.01) D01F 9/127 (2006.01)

Patent

CA 2596938

In the present invention, advanced catalysts for the production of high purity and high quality carbon nanotubes with the technique of chemical vapor deposition are described. The use of these catalysts and the described methodology allows the production of carbon nanotubes at high rates and with yields per mass unit of catalytic material, which are much higher than those achieved with other methods of carbon nannotubes production and other catalysts. The high yields, the high production rates and the very low cost of the catalysts that are employed in the developed method lead to the production of materials that cost much less than commercially available materials of similar or lower quality. The catalyst or the catalytic substrate on which carbon is deposited and grows in the form of nanotubes consists of the carrier or the substrate, which is aluminum oxide (alumina) or one of the other metal oxides that are usually employed as catalytic media, the active phase which is iron oxide (preferably hematite but also any other form) and a promoter, such as molybdenum oxide. The ratio of these three components plays a very important role in the composition of the catalyst.

La présente invention concerne des catalyseurs avancés pour la production de nanotubes de carbone de grande qualité et de grande pureté au moyen d~un dépôt chimique en phase vapeur. L~utilisation de ces catalyseurs et la méthodologie décrite permettent la production de nanotubes de carbone à des vitesses élevées et avec des rendements élevés par unité de masse de matériau catalytique nettement supérieurs à ceux obtenus au moyen des autres procédés de production de nanotubes de carbone et des autres catalyseurs. Les rendements et les vitesses de production élevés ainsi que le coût très bas des catalyseurs employés dans le procédé mis au point conduisent à la production de matériaux qui sont bien moins onéreux que les matériaux de qualité identique ou inférieure disponibles sur le marché. Le catalyseur ou le substrat catalytique sur lequel le carbone est déposé et prend la forme de nanotubes se compose du porteur ou du substrat qui est de l~oxyde d~aluminium (alumine) ou un des autres oxydes de métaux traditionnellement utilisés en tant que milieu catalytique. Il comprend également la phase active qui est de l~oxyde de fer (de préférence de l~hématite, mais également toute autre forme) et un promoteur tel que l~oxyde de molybdène. Le rapport entre ces trois composés joue un rôle très important dans la composition du catalyseur.

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