Patent ID: 7563427
Filing Date: 2009-07-21
Classification: B01J,B82Y,C01B,Y10S

Abstract:
1. A method for continuous production of carbon nanotubes in a nano-agglomerate fluidized bed, comprising: 1) loading transition metal oxide on a support to form a transition metal catalyst; 2) adding said transition metal oxide catalyst into a catalyst activation reactor, flowing a mixture of (i) nitrogen and hydrogen or (ii) a mixture of nitrogen and carbon monoxide into the reactor at 500-900° C. to reduce nanosized transition metal oxide particles to nanosized metal particles, wherein the volume ratio of hydrogen or carbon monoxide to nitrogen is 1:0.3 to 1:1, the space velocity during the reduction reaction is from 0.3 h 3) transporting the catalyst into a fluidized-bed reactor, flowing a mixture of (a) a carbon-source-gas which is a gas of lower hydrocarbons having less than 7 carbon atoms, (b) nitrogen and (c) either hydrogen or carbon monoxide into the reactor at 500-900° C., wherein the volume ratio of hydrogen or carbon monoxide:carbon-source-gas:nitrogen equals 0.4-1:1:0.1-2, the space velocity during the reaction is 5-10000 h