Abstract
Transmission infrared spectroscopy was used to monitor CCl x (a) intermediate surface species formed during the decomposition of CCl 4 on high surface area calcium oxide. Carbon tetrachloride was adsorbed on calcium oxide at 113 K During CCl 4 desorption, additional infrared bands at 801, 787, 775, 765, and 751 cm -1 were observed in the temperature range 110-250 K. These bands, which disappeared in the temperature range 150-250 K, were attributed to the formation and depletion of CCl x (a) species as C-Cl bonds are broken and Ca-Cl bonds are formed on the CaO surface. Carbon tetrachloride ( 13 C labeled) was employed to prove that the infrared bands of the surface intermediates were due to C-Cl vibrational modes. To compare carbon tetrachloride decomposition on different types of calcium oxides, both autoclave prepared (nanoscale particles) and conventionally prepared CaO were investigated.
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