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An attempt to a semi-quantitative analysis of Lewis acid sites in H-ZSM-5 zeolite using water as an IR-spectroscopic titrant

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Abstract

Water adsorption on H-ZSM-5 (with/without Lewis acid sites; LAS) at room temperature was studied by means of FT-IR spectroscopy. It has been clearly observed that water adsorbs preferentially on LAS. This result indicates that the IR bands at ca. 3550, 2900, 2400, 1600, and 1350 cm−1, which are characteristic of water adsorbed on Brønsted acid sites (BAS), can be used as indicators of BAS; water can serve as an IR-spectroscopic titrant of LAS. Using this fact, an attempt was made to determine the absolute number of LAS in the H-form zeolites using water as a titrant. While this method has many restrictions in this stage, a relatively good result was obtained compared with that obtained previously for the same sample.

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Authors and Affiliations

  1. Department of Science and Engineering, National Science Museum, 3-23-1 Hyakunin-cho, Shinjuku-ku, 169, Tokyo, Japan

    Fumitaka Wakabayashi

  2. Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 226, Yokohama, Japan

    Junko N. Kondo, Kazunari Domen & Chiaki Hirose

Authors
  1. Fumitaka Wakabayashi
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  2. Junko N. Kondo
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  3. Kazunari Domen
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  4. Chiaki Hirose
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Wakabayashi, F., Kondo, J.N., Domen, K. et al. An attempt to a semi-quantitative analysis of Lewis acid sites in H-ZSM-5 zeolite using water as an IR-spectroscopic titrant. Catal Lett 38, 15–19 (1996). https://doi.org/10.1007/BF00806893

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  • DOI: https://doi.org/10.1007/BF00806893

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