Study of different states of nonframework aluminum in hydrothermally dealuminated HZSM-5 zeolites using diffuse reflectance i.r. spectroscopy

Study of different states of nonframework aluminum in hydrothermally dealuminated HZSM-5 zeolites using diffuse reflectance i.r. spectroscopy Full article

Journal

Zeolites
ISSN: 0144-2449 , E-ISSN: 1873-3115

Output data

Year: 1990, Volume: 10, Number: 4, Pages: 266-271 Pages count : 6 DOI: 10.1016/0144-2449(94)90138-4

Authors

Loeffler E. ¹ , Lohse U. ¹ , Peuker Ch. ¹ , Oehlmann G. ¹ , Kustov L.M. ² , Zholobenko V.L. ² , Kazansky V.B. ²

Affiliations

1	Central Institute of Physical Chemistry of the Academy of Sciences of the GDR, Berlin, GDR
2	N.D. Zelinsky Institute of Organic Chemistry of the Academy of Sciences of the USSR, Moscow, USSR

HZSM-5 zeolites dealuminated under mild and severe hydrothermal conditions were studied using diffuse reflectance i.r. spectroscopy. It was shown that dependent on the treatment conditions different types of acidic sites (up to five) appear because of formation of nonframework aluminum. Most of these species represented hydroxylated fragments with acid strength lower than that of bridged hydroxyls. It was shown that only a small portion of nonframework aluminum species exhibited properties of Lewis acid sites.

Loeffler E. , Lohse U. , Peuker C. , Oehlmann G. , Kustov L.M. , Zholobenko V.L. , Kazansky V.B.
Study of different states of nonframework aluminum in hydrothermally dealuminated HZSM-5 zeolites using diffuse reflectance i.r. spectroscopy
Zeolites. 1990. V.10. N4. P.266-271. DOI: 10.1016/0144-2449(94)90138-4 OpenAlex

≡ OpenAlex:

W2072452070