The potential of two different mesoporous materials, MCM-41- and MCM-48-supported sulfided CoMo
bimetallic catalysts, for hydrodesulfurization (HDS) of thiophene at specific conditions was explored to
investigate the effect of channel connectivity on HDS activity. The hydrothermal stability of MCM-41 and
MCM-48 was improved remarkably by a post-salt treatment technique. Aluminum incorporation to mesoporous
material frameworks improved acidity and hydrothermal stability. Mesoporous-material-supported CoMo
catalysts with different Co/Mo atomic ratios were prepared by coimpregnation of Co(NO3)2·6H2O and (NH4)6Mo7O24·4H2O. The characterization of the catalysts was carried out by X-ray diffraction (XRD), N2 adsorption/desorption, NH3-temperature-programmed desorption (NH3-TPD), transmission electron microscopy (TEM),
CO chemisorption, elemental analysis (EA), and 13C NMR. MCM-41-supported catalysts showed a small
decrease in activity compared to MCM-48-supported catalysts. The optimal Co/Mo atomic ratio for MCM-41- and MCM-48-supported series of catalysts was 3:7. The aluminosilicate-supported CoMo catalysts showed
higher activities than their siliceous counterparts.
Recently, the demand for floating solar power farms in lakes and coasts (rather than on land) has been increasing rapidly. It is important to develop a numerical analysis technique that considers environmental conditions to predict structural stability and accurate motion response while designing a floating solar power farm. In this study, we performed a comparison under conditions similar to those of the Inha University towing tank (IUTT) model test to verify the numerical analysis method. The results revealed that heave and pitch movements were dominant under head sea conditions. Relative behavior occurred because of the hinge connection of each unit, and complex motion characteristics appeared depending on the wave conditions. The numerical method was verified based on the motion response and load of the floating solar farm. The validity of the results was also confirmed.
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