Effect of Crystal Sizes on Steaming and Thermal Durabilities

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Other Title
  • ZSM-5ゼオライトの耐スチーミング性,耐熱性に与える結晶粒径の影響

Description

Various ZSM-5 type zeolites having different crystal sizes with Si/Al ratio of 80 were synthesized by varing the synthesis time and the OH-/SiO2 ratio in the synthesis mixture. The steaming durabilities, the themal durabilities and the catalytic activities for methanol conversion were investigated. The crystal sizes were hardly influenced by the synthesis time, but strongly influenced by the OH-/SiO2 ratio in the synthesis mixture.<BR>The large cr ystallites synthesized at the OH-/SiO2 ratio of 0.14 had larger amount of acidic sites after steaming than smaller crystallites. The structure of ZSM-5 crystallites was destroyed at a temperature of 1373 K or above, and transformed to the cristobalite structure at 1473 K. The destruction temperature of large ZSM-5 crystallites was higher than that of smaller ZSM-5 crystallites. The conversion of methanol to hydrocarbons decreased with an decrease in the amount of the strong acidic sites by steaming.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1994 (10), 867-873, 1994-10-10

    The Chemical Society of Japan

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