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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Decomposition of carbon dioxide using mechanically-milled magnetite
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Decomposition of carbon dioxide using mechanically-milled magnetite

机译：使用机械研磨的磁铁矿分解二氧化碳

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摘要

In recent years, various studies have been reported on decomposition of carbon dioxide into carbon using iron oxide. This study investigates the ability of mechanically-milled magnetite powder to decompose carbon dioxide as well as the effect of mechanical milling on the crystal structure change. Mechanical milling was performed on magnetite powder using a high-energy vibration ball-milling machine. After 6-12 h of milling, Fe and αFe_2O_3 phases appear in addition to the magnetite phase, followed by disappearance of the αFe_2O_3 phase after 24 h of milling, and an FeO phase appears after 72-168 h. The Fe_3O_4 content phase gradually decreases with milling. The carbon dioxide decomposition with the milled powder was carried out in a quartz tube for 3 h at 773 K. The carbon content of the sample after the CO_2 decomposition increases slightly with the milling time up to 48 h and shows drastic increase when the milling time is longer than 72 h, indicating that the production of FeO phase contributes to the ability of CO_2 decomposition. After the decomposition the sample contains graphite (or other types of carbon), undissolved Fe (both bcc and fcc structure) and Fe_3O_4 phase.
机译：近年来，已经报道了关于使用氧化铁将二氧化碳分解为碳的各种研究。这项研究调查了机械研磨的磁铁矿粉分解二氧化碳的能力，以及机械研磨对晶体结构变化的影响。使用高能振动球磨机对磁铁矿粉进行机械研磨。研磨6-12小时后，除磁铁矿相外还出现Fe和αFe_2O_3相，接着研磨24 h后αFe_2O_3相消失，而在72-168 h后出现FeO相。随着研磨，Fe_3O_4的含量相逐渐降低。研磨粉的二氧化碳在773 K的石英管中进行3 h分解。CO_2分解后样品中的碳含量随研磨时间延长至48 h略有增加，而随着研磨时间的增加，碳含量急剧增加。大于72小时，表明FeO相的产生有助于CO 2分解的能力。分解后，样品包含石墨（或其他类型的碳），未溶解的Fe（bcc和fcc结构）和Fe_3O_4相。

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