Abstract Submitted to the    NANOTUBE'04 Conference:

SWCNT syntheses were conducted by methane crack over Fe/MgO catalysts. BET measurement was conducted between twice methane crack, and the methane conversion was markedly enhanced, such as from 0.06 to 0.24, after BET measurement. The circle of conversion rate decrease during carbon deposition and increase after BET measurement was kept before the methane conversion dropped to zero. The as-prepared materials contain abundance of SWCNTs without CNFs, MWCNTs and other impurities. The nitrogen adsorption was considered as an important factor for the enhance of methane conversion.