Sol-Gel Derived CuO@SiO۲ Nano-Composites for Nitrate Ions Conversion in Nuclear Effluent samples

The xerogel samples were prepared by hydrolysis and condensation of tetraethyl ortho-silicate (TEOS) by the sol-gel method. In this investigation, a new molar ratio of H۲O/TEOS was determined to be ۱۱.۷. Also, the necessary amounts of tri-hydrated copper nitrate and penta-hydrated copper sulfate were added to the solution in such a manner that the concentration of the copper oxide in final solution reach to ۱۰-۱۲ wt %. After ambient drying, the xerogel samples were heated at ۴۰۰, ۶۰۰, and ۸۰۰˚C at a slow heating rate (۵۰°C/h). The structural properties were characterized by Transmission Electron Microscopy (TEM), Brunauer, Emmett and Teller theory for specific surface area determination (BET) and Thermal Program Reduction (TPR) methods at different temperatures. Finally, characterization of nano-composites was studied for NH۳ selective catalytic reduction (NH۳-SCR) of nitrate ions and following it conversion to NOx (X=۱) in gas phase in the nuclear effluent samples. The results were presented the systematic reactivity study of NO reduction by NH۳ on dispersed copper oxide nano-composites over silica supports, in order to determine the ability of these materials to conversion into harmless species at different temperatures.

کلیدواژه ها:

Copper oxide ، Catalytic Activity ، Nano-Composites ، NO Reduction ، Nuclear Samples.