Thermodynamic Analyses of Structural Changes of Iron Based Catalysts.
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概要
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Thermodynamic analyses were done for better understanding of the structural changes in iron based coal liquefaction catalysts during sulfidation and oxida-tion. Chemical potential diagrams were used to evaluate the stability/reactivity of several iron phases such as Fe, Fe<SUB>3</SUB>O<SUB>4</SUB> (magnetite), Fe<SUB>2</SUB><SUB>O3</SUB> (hematite), Fe<SUB>0.877</SUB>S (Pyrrhotite), FeS<SUB>2</SUB> (phyrite), FeSO<SUB>4</SUB>, and Fe<SUB>2</SUB> (SO<SUB>4</SUB>) <SUB>3</SUB>. These analyses indicated that most of the iron starting materials would be converted into thermodynamically stable phase Fe<SUB>0.877</SUB>S under typical coal liquefaction conditions, i.e., reaction temperature of 698K under reducing/sulfiding conditions. However, the sulfidation paths were quite different in Fe<SUB>2</SUB>O<SUB>3</SUB> and FeSO<SUB>4</SUB> as the starting materials, and were influenced significantly by the sul-fidation conditions, such as temperature, P (H<SUB>2</SUB>S) /P (H<SUB>2</SUB>) and P (H2O). These analyses suggested that steaming conditions would facilitate the sulfidation, but cause the gas phase transport of hydrated compounds, which might be one of the reasons for catalyst agglomeration.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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