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SUBSTITUTION OF AL IN THE ALPO4-5 AND ALPO4-11 FRAMEWORKS BY SI AND FE - A STUDY BY MOSSBAUER, MAGIC-ANGLE-SPINNING NUCLEAR-MAGNETIC-RESONANCE AND ELECTRON-PARAMAGNETIC RESONANCE SPECTROSCOPIES AND CHEMICAL PROBES

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Title SUBSTITUTION OF AL IN THE ALPO4-5 AND ALPO4-11 FRAMEWORKS BY SI AND FE - A STUDY BY MOSSBAUER, MAGIC-ANGLE-SPINNING NUCLEAR-MAGNETIC-RESONANCE AND ELECTRON-PARAMAGNETIC RESONANCE SPECTROSCOPIES AND CHEMICAL PROBES
 
Creator DAS, J
SATYANARYANA, CVV
CHAKRABARTY, DK
PIRAMANAYAGAM, SN
SHRINGI, SN
 
Subject crystalline inorganic solids
silicoaluminophosphate molecular-sieves
nmr
sapo-5
zeolites
al-27
p-31
 
Description Substitution of Al by Fe and Si in the AlPO4-5 and AIPO4-11 frameworks has been investigated by a number of experimental methods such as electron paramagnetic resonance (EPR), Mossbauer and magic-angle-spinning nuclear magnetic resonance (MASNMR) spectroscopies and temperature-programmed desorption of ammonia. There are indications that Fe(III) replaces Al(III) and the extent of substitution increases with time of reaction. The FAPO-n formed, however, is contaminated with an amorphous phase containing Fe(III). Silicon replaces phosphorus in the framework only to a limited extent and in those cases when the synthesis gel had a higher amount of silicon, the product was contaminated with an amorphous silica-containing phase. No evidence tor silicon removing a phosphorus-aluminium pair has been found. The conclusions are also supported by the results of acidity measurements and the alkylation of toluene with methanol on these molecular sieve samples.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2011-08-28T19:23:38Z
2011-12-26T12:58:11Z
2011-12-27T05:47:41Z
2011-08-28T19:23:38Z
2011-12-26T12:58:11Z
2011-12-27T05:47:41Z
1992
 
Type Article
 
Identifier JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 88(21), 3255-3261
0956-5000
http://dx.doi.org/10.1039/ft9928803255
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11825
http://hdl.handle.net/10054/11825
 
Language en