✍ Scribed by Samih A. Halawy; Mohamed A. Mohamed
No coin nor oath required. For personal study only.
Three different samples of ZnO were prepared from the thermal decomposition, at 500°C in N,, of three precursors, i.e. Zn(CH3C0,),.2H,0, Zn3(C,H,0,)2.2H,0 and Zn(N0s)2.6H,0. These oxide samples were characterized by XRD and IR spectroscopy and their surface area were calculated using the BET method. The excess surface oxygen for each oxide was determined using the hydrazine method. Also, the basicity of such oxides were estimated thermogravimetrically using formic acid adsorption method. The catalytic decomposition of ethanol, as a test reaction, was studied over ZnO samples in a flow system. Ethylene and acetaldehyde were identified as the reaction products using gas chromatography. The activation energy for the decomposition process of ethanol over ZnO samples was calculated as -43 kJ mol-'. Reaction mechanisms for the formation of ethylene and acetaldehyde as the decomposition products of ethanol are given.
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