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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4059

Title: Small pore aluminum phosphate molecular sieves with chabazite structure: Incorporation of manganese in the structures -34 and -44
Authors: ASHTEKAR, S
CHILUKURI, SVV
PRAKASH, AM
CHAKRABARTY, DK
Keywords: p-31 nmr
magnetic-resonance
silicoaluminophosphates
substitution
methanol
sapo-44
mn(ii)
al-27
al
Issue Date: 1996
Publisher: AMER CHEMICAL SOC
Citation: JOURNAL OF PHYSICAL CHEMISTRY, 100(9), 3665-3670
Abstract: MnAPO and MnSAPO (APO = aluminum phosphate; SAPO = silicoaluminophosphate) with -34 and -44 framework structures have been synthesized. Rapid synthesis of MnAPO-34 could be achieved using morpholine as the template that subsequently changes to MnAPO-20 during synthesis. The presence of manganese in the framework has been established by a number of experimental techniques. ESR spectra of the low manganese containing samples were better resolved, and by comparison of these with the ESR of Mn2+-exchanged samples, it was possible to conclude that Mn2+ was present in the framework of the MnSAPOs. The nature of the silicon site depended on the manganese content of the sample as seen from Si-29 MASNMR. With higher manganese content, more silica-rich regions next to SAPO domains in the framework were formed. In MnAPO-44, a complete ordering of the T atoms appeared to have been achieved with every P atom being surrounded by three Al and one Mn. DTA-TG, infrared, and UV-visible spectra of the samples will be discussed.
URI: http://dx.doi.org/10.1021/jp951800c
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4059
http://hdl.handle.net/10054/4059
ISSN: 0022-3654
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