Interactions between Carbon and Metal Oxides and Their Effects on the Carbon/CO2 Reactivity at High Temperatures
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- 作者：Shiyong Wu ; Xiao Zhang ; Jing Gu ; Youqing Wu ; Jinsheng Gao
- 刊名：Energy & Fuels
- 出版年：2007
- 出版时间：July 2007
- 年：2007
- 卷：21
- 期：4
- 页码：1827 - 1831
- 全文大小：85K
- 年卷期：v.21,no.4(July 2007)
- ISSN：1520-5029
文摘
Under the nitrogen atmosphere, carbothermal reactions of calcium oxide and magnetite began at about 900and 820 
C, respectively. Above about 1200 C, CaO reacted with carbon to form CaC2, and the interactionbetween carbon and CaO was dominant. At the temperature range of 820-920 C, Fe3O4 was reduced quicklyto Fe. After the process, with the increase of the heat-treatment temperature, Fe reacted with carbon to producethe eutectic compound of Fe and carbon (FexCy) and the mole ratio of C and Fe in FexCy became larger andlarger but no Fe3C was presented. At the low-temperature range of 950-1100 C, calcium oxide and magnetiteseparately presented a catalytic action on the reactivity of carbon and the mixture of calcium oxide and magnetitehad a cocatalytic effect on the carbon reaction with CO2. Under the CO2 atmosphere, the carbothermal reactionsof metal oxides were restrained in the temperature range (950-1100 C) above the point, at which thecarbothermal reaction of metal oxides started to take place under the N2 atmosphere.
C, respectively. Above about 1200 C, CaO reacted with carbon to form CaC2, and the interactionbetween carbon and CaO was dominant. At the temperature range of 820-920 C, Fe3O4 was reduced quicklyto Fe. After the process, with the increase of the heat-treatment temperature, Fe reacted with carbon to producethe eutectic compound of Fe and carbon (FexCy) and the mole ratio of C and Fe in FexCy became larger andlarger but no Fe3C was presented. At the low-temperature range of 950-1100 C, calcium oxide and magnetiteseparately presented a catalytic action on the reactivity of carbon and the mixture of calcium oxide and magnetitehad a cocatalytic effect on the carbon reaction with CO2. Under the CO2 atmosphere, the carbothermal reactionsof metal oxides were restrained in the temperature range (950-1100 C) above the point, at which thecarbothermal reaction of metal oxides started to take place under the N2 atmosphere.