This paper reports for the first time the size control of well-defined and morphologically pure alumina (gAl 2 O 3 ) nanorods, presenting an economic and reproducible route for the manufacture of these materials with tuneable sizes for useful applications, for example serving as adsorbents, catalysts and catalyst supports. A detailed understanding of the different steps taking place during the hydrothermal synthesis has been deduced herein. Understanding the effect of temperature on the relative rates of these steps is essential for achieving size and morphology selectivity, but has often been overlooked in the literature.This systematic study identifies six distinct steps taking place during the synthesis: (1)

Hydrogen production from ammonia decomposition using Co/-Al 2 O 3 catalysts -Insights into the effect of synthetic method.

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