Gasification characteristics of carbon nanotube in supercritical water

Carbon nanotube (CNT) gasification kinetics was studied under supercritical water (25 MPa) at temperatures ranging from 600 °C to 700 °C using a packed bed reactor. The CNT was prepared by removing the surfactant from the originally manufactured material. The gasification rate of the CNT was 8.5 times slower than that of activated carbon. In addition, at the high temperature of 700 °C, the carbon gasification efficiency was remarkably enhanced, and certain defects occurred in the CNT. The reaction rate was constant up to a 5% conversion. It was considered that the CNT reacted at both ends, and the shortening speeds on one end were (0.11, 0.39, and 1.6) pm/s at (600, 650, and 700) °C, respectively.