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Solid-state NMR study of ultrastable zeolite Y modified with orthophosphoric acid

✍ Scribed by Waclaw Kolodziejski; Vicente Fornés; Avelino Corma

Book ID
103963705
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
674 KB
Volume
2
Category
Article
ISSN
0926-2040

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✦ Synopsis

29Si, 27Al and 31P solid-state NMR under magic-angle spinning was used for the study of ultrastable zeolite Y modified with HsPO,. The material is a potential candidate for a new generation of oil-cracking catalysts. Bloch decay and cross-polarization spectra were compared. It was found that amorphous aluminium phosphate is formed during the P-impregnation and the following activation, and that it occupies the zeolite surface and internal voids. For a high P-content under steaming conditions, aluminium phosphate is converted into a crystalline form. No evidence has been found for incorporation of P atoms into the zeolite framework.

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✍ João Rocha; Stuart W. Carr; Jacek Klinowski 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 481 KB

H-27Al cross-polarization magic-angle spinning (PC/MA.?) NMR has been used to monitor selectively the non-framework aluminium (AINF) species in dealuminated zeolite Y (Si/AI=4.0-14). \*'AI quadrupole nutation with fast ( 12.5 kHz) MASand radiofrequency excitation fields up to 220 kHz reveals resonan