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Characterization of acidity in zeolites and related oxides using trimethylphosphine as a probe

✍ Scribed by J.H. Lunsford

Book ID
110386085
Publisher
Springer
Year
1997
Tongue
English
Weight
560 KB
Volume
4
Category
Article
ISSN
1022-5528

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Detection of the inhomogeneity of BrΓΈnst
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The BrΓΈnsted acidity of H-mordenite (H-MOR) and H-b with similar Si/Al ratios has been characterized by conventional multinuclear solid-state NMR. 1 H/ 27 Al TRAPDOR NMR showed the presence of at least two different types of BrΓΈnsted acid sites in H-b. On the other hand, only a single 1 H resonance

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The acid sites in dealuminated HZSM-5 zeolite with crystal sizes down to the nanoscale were firstly characterized by the probe molecule trimethylphosphine (TMP). As evidenced by the combination of 31 P CP/MAS NMR, 27 Al MAS and 1 H β†’ 27 Al CP/MAS NMR measurements, the BrΓΆnsted acid sites of both mic