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Effect of crystal size and surface modification of ZSM-5 zeolites on conversion of ethanol to propylene

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Abstract

The conversion of ethanol to propylene was carried out over ZSM-5 zeolites (Si/Al ratio ≈ 20) with a small crystal size of ca. 30 nm. Catalyst deactivation was significantly suppressed over the nanometer-sized ZSM-5 zeolite, indicating that the small crystal was more tolerant to coking. On the other hand, the selectivity of this zeolite to propylene was lower than that of conventional ZSM-5 zeolites (ca. 2 μm). It was suggested that the large external surface area of the nanometer-sized ZSM-5 zeolite catalyzed undesired reactions. To elucidate the reason for the decreased selectivity, the external surfaces of the nanometer-sized crystals were covered with a very thin pure-silica ZSM-5 layer by a hydrothermal synthesis. The obtained crystal maintained the same crystal size and had a silica-rich surface (Si/Al ratio ≈ 50). After the surface modification, the selectivity to propylene was improved without any decrease in the catalyst life.

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Authors and Affiliations

  1. Nanyo Research Laboratory, Tosoh Corporation, Shunan, Yamaguchi, 746-8501, Japan

    Yasuyuki Takamitsu, Kazuaki Yamamoto, Satoshi Yoshida & Hiroshi Ogawa

  2. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan

    Tsuneji Sano

Authors
  1. Yasuyuki Takamitsu
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  2. Kazuaki Yamamoto
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  3. Satoshi Yoshida
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  4. Hiroshi Ogawa
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Correspondence to Yasuyuki Takamitsu.

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Takamitsu, Y., Yamamoto, K., Yoshida, S. et al. Effect of crystal size and surface modification of ZSM-5 zeolites on conversion of ethanol to propylene. J Porous Mater 21, 433–440 (2014). https://doi.org/10.1007/s10934-014-9789-4

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