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Characterization of acid sites on γ-alumina and chlorinated γ-alumina by 31P NMR of adsorbed trimethylphosphine

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Abstract

31P MAS NMR of adsorbed trimethylphosphine (TMP) has been used to characterize the surface acid properties of γ-alumina and chlorinated γ-alumina. Combined with thermodesorption of TMP, NMR has allowed the determination of the strength distribution of Brønsted and Lewis acid sites on these samples. γ-alumina chlorination with 1,2-dichloropropane at 500°C first increases the numbers of ``strong'' Lewis and ``strong'' Brønsted acid sites, second decreases the number of ``weak'' Lewis acid sites. The ``strong'' sites are the ones TMP is desorbed from above 200°C and the ``weak'' sites up to 200°C.

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Authors
  1. D. Guillaume
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  2. S. Gautier
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  3. I. Despujol
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  4. F. Alario
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  5. P. Beccat
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Guillaume, D., Gautier, S., Despujol, I. et al. Characterization of acid sites on γ-alumina and chlorinated γ-alumina by 31P NMR of adsorbed trimethylphosphine. Catalysis Letters 43, 213–218 (1997). https://doi.org/10.1023/A:1018955025955

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