On the possible nature of sites responsible for the enhancement of cracking activity of HZSM-5 zeolites dealuminated under mild steaming conditions

On the possible nature of sites responsible for the enhancement of cracking activity of HZSM-5 zeolites dealuminated under mild steaming conditions Full article

Journal

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

Output data

Year: 1990, Volume: 10, Number: 4, Pages: 304-306 Pages count : 3 DOI: 10.1016/0144-2449(94)90146-5

Authors

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

Affiliations

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

Acid sites in HZSM-5 zeolites dealuminated under mild hydrothermal conditions were studied using diffuse reflectance i.r. spectroscopy. It was shown that dealumination of the framework led to a decrease of the concentration of strongly acidic OH groups of the bridged type as well as to the appearance of new types of OH groups with weaker acidic properties. Using adsorption of probe molecules. (CH4, H2), Lewis acidic sites attributed to nonframework aluminium species were found that are capable of polarizing paraffin molecules. The conclusion has been drawn that these sites are responsible for a considerable enhancement of the catalytic activity inn-hexane cracking for HZSM-5 zeolites dealuminated under mild hydrothermal conditions.

Zholobenko V.L. , Kustov L.M. , Kazansky V.B. , Loeffler E. , Lohser U. , Peuker C. , Oehlmann G.
On the possible nature of sites responsible for the enhancement of cracking activity of HZSM-5 zeolites dealuminated under mild steaming conditions
Zeolites. 1990. V.10. N4. P.304-306. DOI: 10.1016/0144-2449(94)90146-5 OpenAlex

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