Reactivity of Fe2O3 and Fe2O3-Al2O3 mixture for reduction of SO2 with CO.
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概要
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Catalytic reactivities of α-Fe<SUB>2</SUB>O<SUB>3</SUB> powder (−200 mesh) and a α-Fe<SUB>2</SUB>O<SUB>3</SUB>–γ-Al<SUB>2</SUB>O<SUB>3</SUB> powder mixture prepared by mechanical mixing, which were preheated at 360–700 °C, were studied for the reduction of SO<SUB>2</SUB> with CO by means of both a reaction gas-chromatographic technique using CO, SO<SUB>2</SUB>, and 2CO–SO<SUB>2</SUB> pulses and the powder X-ray analysis. The reactivity of Fe<SUB>2</SUB>O<SUB>3</SUB> decreases with increasing preheating temperature, which is explained on the basis of redox reactions between Fe<SUB>2</SUB>O<SUB>3</SUB> and nascent (Fe<SUB>3</SUB>O<SUB>4</SUB>): 6Fe<SUB>2</SUB>O<SUB>3</SUB>+2CO→4(Fe<SUB>3</SUB>O<SUB>4</SUB>)+2CO<SUB>2</SUB> and 4(Fe<SUB>3</SUB>O<SUB>4</SUB>)+SO<SUB>2</SUB>→6Fe<SUB>2</SUB>O<SUB>3</SUB>+1/2S<SUB>2</SUB>. It is considered that the reactivity of Fe<SUB>2</SUB>O<SUB>3</SUB> is attributable to the activity of (Fe<SUB>3</SUB>O<SUB>4</SUB>). The lifetime of active (Fe<SUB>3</SUB>O<SUB>4</SUB>) is within about 1 min, and the activity and lifetime of (Fe<SUB>3</SUB>O<SUB>4</SUB>) is increased by interfacial reaction between Fe<SUB>2</SUB>O<SUB>3</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB> at 700 °C. The activity maximum in the Fe<SUB>2</SUB>O<SUB>3</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB> system preheated at 700 °C is attained at 70–75 wt% Fe<SUB>2</SUB>O<SUB>3</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Ishii Tadao
Deparmtnet Of Poultry And Animal Sciences Gifu University
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Furuichi Ryusaburo
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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Ishii Tadao
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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Shikano Koji
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University
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