Effects of various gas-pretreatments of the Fe powder, prepared by the reduction of FeI2 with potassium metal, on the catalytic properties in Fischer-Tropsch synthesis.

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概要

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• Fischer–Tropsch (F–T) synthesis was carried out on the Fe powder catalyst prepared by the reduction of FeI<SUB>2</SUB> with potassium metal in refluxing tetrahydrofuran (THF). 1-Butene was obtained with 37 wt% selectivity and a rather high conversion of 12 wt% by an autoclave system at 553 K. After H<SUB>2</SUB>-pretreatment of the Fe powder at 573 K, propylene was produced as the major product (15 wt% selectivity) under otherwise the same experimental conditions. In a conventional flow system with a stream of H<SUB>2</SUB>, H<SUB>2</SUB>/CO, and CO during a heatup period of the reactor to 533 K, C<SUB>3</SUB>, C<SUB>4</SUB>, and C<SUB>5</SUB> olefins were produced as major products, respectively. The synthesized Fe powder contains 1.6 wt% of carbon, which may be produced by the decomposition of THF in preparation of the catalyst. During the gas-pretreatment of the Fe powder in the flow reactor, evolution of CH<SUB>4</SUB> CO<SUB>2</SUB>, and CO was observed. The amount of carbon on the Fe powder produced after the gas-pretreatment varied with the pretreatment gas in the order, CO > H<SUB>2</SUB>/CO > H<SUB>2</SUB>. Quantitative X-ray photoelectron spectroscopy (XPS) analysis of the Fe powder surfaces indicates that a significant amount of carbonaceous species is accumulated during the F–T reaction, and that the accumulation of such species can be avoided by the H<SUB>2</SUB>-pretreatment of the Fe powder. The change in surface properties by the gas-pretreatments is discussed in relation to the corresponding change of the product distribution in the F–T synthesis.

• 公益社団法人 日本化学会の論文

著者

• Miyake Mikio

  Department Of Surgery Tamano Mitsui Hospital

• Nomura Masakatsu

  Department Of Applied Chemistry Faculty Of Engineering Osaka University

• Hamaguchi Maki

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• Shimada Hiromichi

  Surface Chemistry Division, National Chemical Laboratory for Industry

• Nishijima Akio

  Surface Chemistry Division, National Chemical Laboratory for Industry

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