ARTICLE IN PRESS
A.V. Ghule et al. / Journal of Solid State Chemistry 182 (2009) 3406–3411
3411
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In this work, utility of hyphenated thermogravimetric analyzer
and TRS has been shown for monitoring the dynamic thermal
process of NiO–Al2O3 catalyst formation from solid-state reaction
with controlled heating at the rate of 5 1C minÀ1. TGA-DTG data
were in harmony with the thermo-Raman data. Monitoring the
thermal processes by TRS provides useful and direct structural
information compared to other conventional techniques, which
provides limited information. Furthermore, it was observed that
the solid-state reaction produces well-crystallized NiO–Al2O3
nanoparticles at lower temperature and is supported by the XRD
data. The NiO–Al2O3 obtained in the solid-state reaction has
uniform size distribution of ꢀ20–30 nm in diameter. This was
supported by complementary characterizations using XRD, TEM,
and SEM. Based on our thermo-Raman and microscopy studies, it
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NiO–Al2O3 catalyst, however, higher temperatures can be used to
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NiAl2O4 forms at temperatures above 800 1C although the onset of
formation is around 600 1C. Furthermore, this study unambigu-
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Acknowledgments
Financial support by National Science Council (NSC94-2218-E-
007-052 and NSC95-2113-M-007-044-MY3) and National Tsing
Hua University are gratefully acknowledged.
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