Highly selective synthesis of high octane-number gasoline from light olefins on Fe-silicates.

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  • INUI Tomoyuki
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • OKAZUMI Fumio
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • TARUMOTO Junichi
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • YAMASE Osamu
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • MATSUDA Hirokazu
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • NAGATA Hideo
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • DAITO Noboru
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University
  • MIYAMOTO Akira
    Department of Hydrocarbon Chemistry, Faculty of Engineering, Kyoto University

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Other Title
  • 鉄シリケート触媒上での低級オレフィンから高オクタン価ガソリンの高選択的合成

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The conversion of light olefins such as ethylene, propylene, and butenes to gasoline was investigated with various metallosilicates having a pentasil pore-opening structure. The metallosilicates were prepared using a novel rapid crystallization method by replacing the Al ingredient in the H-ZSM-5 with various metal salts at the gel formation stage. The silicates of Al(i.e., H-ZSM-5), Ga, V, Cr, and Zr were not highly effective for selective conversion to liquid products because of a significant formation of gaseous C1-C4 paraffins accompanied with the formation of aromatics. On the other hand, Fe-silicates were highly effective for selective formation of liquid products in the gasoline fraction. For example, 95.6% propylene fed was converted under the space velocity of 4, 500h-1 and at 300°C to the liquid products with a space-time yield as high as 8.09kg/l•h. The octane-number of the gasoline produced was as high as 95 because of the high percentage of branched internal-olefins found in the liquid products. The Fe-silicate exhibited high activity and selectivity under various conditions, and maintained its steady performance at least 100h on stream. The reason for this high gasoline selectivity of Fe-silicate was discussed in relation to its properties and performance in methanol conversion to hydrocarbons.

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