Catalytic behavior and phase composition change of iron catalyst in hydrogenation of carbon dioxide.

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概要

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• Hydrogenation of CO<SUB>2</sUB> was conducted on iron catalyst under various reaction conditions to explore the catalytic behavior and the change of bulk phase composition. It was found by the use of Mössbauer spectroscopy that the metallic iron phase was transformed to a mixture of magnetite and carbides progressively during the course of reaction. The formation of Fe<SUB>3</SUB>O<SUB>4</SUB> phase became more favorable under conditions which led to a high H<SUB>2</SUB>O partial pressure on the catalyst bed. On the other hand, the carburization of iron catalyst was enhanced at higher temperature, with <I>χ</I>-Fe<SUB>5</SUB>C<SUB>2</SUB> phase being predominant over <I>θ</I>-Fe<SUB>3</SUB>C phase. Due to the fact that H<SUB>2</SUB>O produced in the Fischer–Tropsch reaction also contributes to the equilibrium of the reverse water–gas shift reaction, the common product H<SUB>2</SUB>O of these two steps plays a major role in suppression of overall CO<SUB>2</SUB> conversion level.

• The Society of Chemical Engineers, Japanの論文

著者

• Lee Jyh-Fu

  Department of Chemical Engineering, National Taiwan University

• Lee Min-Dar

  Department of Chemical Engineering, National Taiwan University

• Chang Chau-Shang

  Department of Chemical Engineering, National Taiwan University

関連論文

• Catalytic behavior and phase composition change of iron catalyst in hydrogenation of carbon dioxide.
• Hydrogenation of carbon dioxide on unpromoted and potassium-promoted iron catalysts.

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