The synthesis of silicalite-2 (MEL structure) is reported in order to understand the effect, on chemico-physical properties, of some parameter modifications during the synthesis, such as silica source. MEL type zeolites with intergrowth with MFI-type structure were prepared and the percentage of the two phases has been changed. The effect of synthesis parameters on crystals shape and size was investigated. Silicalite-2 catalysts were tested in the vapour phase Beckmann rearrangement of cyclohexanone oxime. In some cases interesting results leading to long catalyst lifetime (over 80 hours) and interesting caprolactam selectivity (>90%) are obtained.
High-silica MEL structures: synthesis parameters modification and catalytic results on Beckmann rearrangement reaction / L. Forni; G. Fornasari; M. Guerrini; F. Trifirò; A. Macario; A. Katovic; C. Giordano; J. B.Nagy. - STAMPA. - 158:Part B(2005), pp. 1787-1794. (Intervento presentato al convegno 3rd International Zeolite Symposium (3rd FEZA) tenutosi a Prague, Czech Republic nel August, 23-26, 2005) [10.1016/S0167-2991(05)80539-7].
High-silica MEL structures: synthesis parameters modification and catalytic results on Beckmann rearrangement reaction
FORNI, LAURA;FORNASARI, GIUSEPPE;TRIFIRO', FERRUCCIO;
2005
Abstract
The synthesis of silicalite-2 (MEL structure) is reported in order to understand the effect, on chemico-physical properties, of some parameter modifications during the synthesis, such as silica source. MEL type zeolites with intergrowth with MFI-type structure were prepared and the percentage of the two phases has been changed. The effect of synthesis parameters on crystals shape and size was investigated. Silicalite-2 catalysts were tested in the vapour phase Beckmann rearrangement of cyclohexanone oxime. In some cases interesting results leading to long catalyst lifetime (over 80 hours) and interesting caprolactam selectivity (>90%) are obtained.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
