✦ LIBER ✦

Synthesis and characterization of silicon-rich SAPO-44 molecular sieves

✍ Scribed by A.M. Prakash; S. Unnikrishnan; K.V. Rao

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 774 KB
Volume: 110
Category: Article
ISSN: 0926-860X
DOI: 10.1016/0926-860x(94)80100-2

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✦ Synopsis

Silicon-rich SAPO-44 molecular sieve was synthesized using cyclohexylamine as ternplating agent and the material was characterized by various physico-chemical techniques. Isomorphous substitution of silicon for Al-P pairs was observed as the major substitution mechanism. 2pSi magic angle spinning nuclear magnetic resonance studies showed the existence of aluminosilicate domains in the molecular sieve framework. The acidity of such silicon-rich materials is however comparable to that of other SAP0 molecular sieves. The material exhibits high selectivity towards formation of alkenes of lower carbon number while catalyzing the conversion of methanol.

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