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Activity in the Knoevenagel condensation of encapsulated basic cesium species in faujasite CsNaX or CsNaY

✍ Scribed by I Rodriguez; H Cambon; D Brunel; M Laspéras

Book ID: 104423588
Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 162 KB
Volume: 130
Category: Article
ISSN: 1381-1169
DOI: 10.1016/s1381-1169(97)00214-8

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✦ Synopsis

The activity of basic species generated in zeolite CsNaX or CsNaY by cesium acetate impregnation and calcination under a synthetic air flow has been investigated. The Knoevenagel condensation of benzaldehyde and ethylcyanoacetate was used as a model reaction. The evaluation of the number of basic sites was carried out by CO TPD. Correlations between initial 2 rates and number of basic sites allowed the determination of the TOF for the modified zeolites. It depends mainly on the host zeolite composition. Moreover, activity varies strongly with crystallinity especially for zeolites Y at high loadings. q 1998 Elsevier Science B.V.

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Post-synthetic modification of basic CsNaX and CsNaY zeolites was performed by impregnation with cesium acetate at various loadings followed by thermal decomposition of the cesium acetate into oxide. A comparative study of the nature and basic character of intrazeolitic species in CsNaX and CsNaY ze