Different titanium silicalites-1(TS-1), synthesized following two different routes in the presence or in the absence of sodium in the precursor gel have been characterized by adsorption of ammonia. Adsorption calorimetric measurements of a basic probe(NH3) and an acidic probe(SO2) have shown that these solids were very acidic compared to a silicalite-1 sample. The presence of Na in the different samples decreases the number and the strength of the acid sites. The modification strongly depends on the synthesis procedure.
ACIDIC PROPERTIES OF TITANIUM-SILICALITES-1 / A. AUROUX, A. GERVASINI, E. JORDA, A. TUEL - In: Studies in Surface Science and Catalysis, Zeolites and Related Microporous Materials: State of the Art / A. Auroux, A. Gervasini, E. Jorda, A. Tuel ; [a cura di] J. Weitkamp, H.G. Karge, H. Pfeifer, W. Hölderich. - Amsterdam : Elsevier, 1994. - ISBN 0-444-81847-2. - pp. 653-659 (( convegno 10th International Zeolite Conference tenutosi a GARMISCH PARTENKIR, GERMANY nel JUL 17-22, 1994.
ACIDIC PROPERTIES OF TITANIUM-SILICALITES-1
A. GERVASINISecondo
;
1994
Abstract
Different titanium silicalites-1(TS-1), synthesized following two different routes in the presence or in the absence of sodium in the precursor gel have been characterized by adsorption of ammonia. Adsorption calorimetric measurements of a basic probe(NH3) and an acidic probe(SO2) have shown that these solids were very acidic compared to a silicalite-1 sample. The presence of Na in the different samples decreases the number and the strength of the acid sites. The modification strongly depends on the synthesis procedure.
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