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SMALL-PORE MOLECULAR-SIEVES SAPO-34 AND SAPO-44 WITH CHABAZITE STRUCTURE - A STUDY OF SILICON INCORPORATION

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Title SMALL-PORE MOLECULAR-SIEVES SAPO-34 AND SAPO-44 WITH CHABAZITE STRUCTURE - A STUDY OF SILICON INCORPORATION
 
Creator ASHTEKAR, S
CHILUKURI, SVV
CHAKRABARTY, DK
 
Subject crystalline inorganic solids
nuclear-magnetic-resonance
state nmr
si
silicoaluminophosphate
conversion
methanol
spectroscopy
hydrocarbons
catalysts
 
Description Two small-pore silicon-substituted molecular sieves SAPO-34 and SAPO-44 with varying amount of silicon have been synthesized and characterized by XRD, SEM, FT-IR spectroscopy, and thermal analyses. Their acidity has been measured quantitatively by temperature-programmed desorption of ammonia. The results of these studies along with solid-state MAS NMR results show that the major part of silicon substitutes isolated phosphorus atoms in the structure whereas some amount of it forms small silica patches. The extent of formation of such small patches is more noticeable in SAPO-34 than in SAPO-44.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T20:35:50Z
2011-12-26T12:47:37Z
2011-12-27T05:37:18Z
2011-07-14T20:35:50Z
2011-12-26T12:47:37Z
2011-12-27T05:37:18Z
1994
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY, 98(18), 4878-4883
0022-3654
http://dx.doi.org/10.1021/j100069a018
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4061
http://hdl.handle.net/10054/4061
 
Language en