Synthesis and characterization of highly ordered MCM-41 in an alkali-free system and its catalytic activity

Autor:	Xiu Song Zhao, Gao Q. Lu, Xin S. Li, Graeme J. Millar
Rok vydání:	1996
Předmět:	Aqueous solution Chemistry Inorganic chemistry General Chemistry Molecular sieve Fluid catalytic cracking Catalysis law.invention MCM-41 law Calcination Mesoporous material Brønsted–Lowry acid–base theory
Zdroj:	Catalysis Letters. 38:33-37
ISSN:	1572-879X 1011-372X
DOI:	10.1007/bf00806896
Popis:	MCM-41 mesoporous molecular sieve materials are synthesised using aqueous ammonia solution to adjust the pH of the reactant gel. Highly ordered MCM-41 with Si/Al ratio as low as 14 was obtained and characterised by27A1 MAS NMR, XRD, N2-adsorption, benzene sorption, and NH3-TPD measurements. The acidity of MCM-41 materials obtained in this system was conveniently generated through straightforward calcination of the as-synthesised sample. More mild acidic sites generated could be due to the avoidance of the multiple calcination procedure and/or the trace sodium species which are the poisons to Bronsted acid. The catalytic activities forn-heptane cracking and isomerization ofm-xylene were investigated, and these were in accordance with the known properties of MCM-41.
Databáze:	OpenAIRE
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