Abstract
Chromium oxide nanocrystallites have been synthesized by thermal decomposition of solid precursors and evaluated as catalysts for ammonia decomposition. The physical and chemical properties of Cr 2O 3 catalysts are characterized by various techniques such as N 2 adsorption–desorption isotherms, XRD, TEM, and XPS. The relationship between catalytic activities and physicochemical and electronic properties of Cr 2O 3 catalysts is investigated. The Cr 2O 3 catalysts are active for ammonia decomposition and the activity is structure-sensitive with a close relation to particle size. During the ammonia decomposition reaction, N atoms are inserted into the Cr 2O 3 catalyst thus enhancing the activity of catalyst, due to the variation in the physical, chemical and electronic structures of Cr 2O 3 catalysts.
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