Characterization of the Lewis acid sites in zeolite HY with the probe molecule trimethylphosphine, and 31P/27Al double resonance NMR

Hsien Ming Kao, Clare P. Grey

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Abstract

31P/27Al TRAPDOR NMR is used to probe the binding of trimethylphosphine on dehydroxylated zeolite HY. Three binding sites are observed at -150°C with 31P isotropic chemical shifts of -32, -46 and -60 ppm. Only the phosphine molecules resonating at -46 ppm show large TRAPDOR effects, demonstrating that these molecules are directly bound to the aluminum Lewis acid sites. The phosphine molecules giving rise to the resonance at -32 ppm are, however, the most strongly bound to zeolite; phosphines bound to the other two sites are mobile at room temperature.

Original languageEnglish
Pages (from-to)459-464
Number of pages6
JournalChemical Physics Letters
Volume259
Issue number3-4
DOIs
StatePublished - 6 Sep 1996

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