Patent ID: 7622059
Filing Date: 2009-11-24
Classification: B82Y,C01B,C01P,C08K,C09C,C09D,H01C,H01G,Y02E

Abstract:
1. A process for synthesizing carbon nanotubes, comprising: a) bringing a first carbon source into contact, in a CNT synthesis reactor, at a temperature between 500 and 1500° C., with a fresh catalyst comprising at least one multivalent transition metal, thereby forming by chemical vapor deposition (CVD), CNTs in the form of an entangled three-dimensional network around catalyst particles or agglomerates with a d b) milling at least some of the CNTs resulting from step a) to obtain a d c) fluidizing the milled product from step b) at a temperature between 500 and 1500° C. in the presence of a second carbon source to obtain CNTs; d) optionally, milling, at least some of the CNTs formed in step c) to obtain a d e) recovering the CNTs resulting from step c) and/or step d).