NDLI: EPR study of coke formed on alumina

Content Provider	Springer Nature Link
Author	Wojtowicz, W. Krawczyk, A. Więckowski, A. B. Fiedorow, R.
Copyright Year	2003
Abstract	This study was aimed at characterizing paramagnetic properties of cokes formed on aluminas of different origin (calcined at 400 and 800°C) during catalytic reactions of hexafluoro-2-propanol decomposition and, for the sake of comparison, 2-propanol decomposition at 300 and 400°C. No significant differences in coke-forming activities were found between alumina obtained by hydrolysis of aluminium isopropoxide and that prepared by precipitation with ammonia from aluminium sulfate solution at pH 6.1, although they differed substantially in their acidity patterns. On the other hand, clear differences were observed between intensities of electron paramagnetic resonance (EPR) spectra recorded for samples covered with coke produced by reactions of the two alcohols. When hexafluoro-2-propanol was the parent substance, spectral lines were stronger and narrower than those obtained for 2-propanol. The smaller linewidth (ΔB pp=0.29-0.54 mT compared to ΔB pp=0.51-0.92 mT) was most likely a result of exchange interactions between electrons of paramagnetic centers, whose concentrations were higher in the carbonaceous deposit formed from fluorine-containing alcohol. Higher temperature of coke formation (400°C) resulted in higher intensities of EPR spectra, whereas higher temperature of alumina calcination (800°C), prior to its use in alcohol decomposition reaction, brought about lower spectral intensities.
Starting Page	343
Ending Page	349
Page Count	7
File Format	PDF
ISSN	09379347
Journal	Applied Magnetic Resonance
Volume Number	24
Issue Number	3-4
e-ISSN	16137507
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid State Physics Spectroscopy/Spectrometry Physical Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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