International Journal of New Chemistry

169-183

Authors: Alireza Rahmani, Hossein Rahmani, Afsaneh Zonouzi

Among a wide range of pollutants, organic pollutants have given rise to major environmental concerns. Various methods have been considered to mitigate the damage, including catalytic reduction to less hazardous compounds. Catalysts that benefit from high surface area and suitable surface sites for various steps of the catalytic reaction have shown outstanding results in performing such duties. Mesoporous CuO/SiO2 has been synthesized and characterized here and it showed excellent results for catalytic removal of methylene blue as a model organic pollutant. Several control samples were also studied to postulate a possible mechanism for activity enhancement.

195-219

Authors: Esmaeil Mousavi, Alireza Bozorgian

In this study, the kinetics of gas hydrate formation in the presence of tetra-n-butyl ammonium fluoride (TBAF) and cetyl trimethyl ammonium bromide surface active ingredient (CTAB) with zinc nano oxide (ZnO) are investigated and the most important kinetic parameters of hydrate formation such as their induction time and storage capacity were measured. The kinetic experiments were carried out in a constant volume temperature method in a high pressure reactor. The storage capacity of carbon dioxide hydrate in water in the presence of ZnO and surfactants at different temperatures, pressures and concentrations of TBAF and CTAB additives was calculated and measured using time induction measurements. The results show that with increasing pressure and decreasing temperature, the storage capacity of CO2 in hydrate increases. Finally, statistical analysis of the parameters affecting the induction time of hydrate formation showed that zinc oxide can reduce the induction time of hydrate formation compared to other additives.

232-246

Authors: Abolfazl Ghaffari, Mahdi Behzad

Kanemite was readily prepared and used as solid base catalyst for transesterification of sunflower oil to fatty acid methyl ester (FAME). The catalyst was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption-desorption and field emission scanning electron microscopy (FESEM) techniques. Central Composite Design (CCD) coupled with Response Surface Methodology (RSM) was utilized to study the effects of the system variables such as catalyst amount, methanol to oil molar ratio, reaction time and specifically, the effect of interaction between process variables on the conversion of oil to biodiesel. Under the optimum reaction conditions (5 wt.% catalyst loading, methanol to oil molar ratio 22:1 and reaction time 240 min), the highest predicted and experimental fatty acid methyl ester conversions were 95.97% and 94.17% ,respectively. Besides, the reusability of the prepared catalyst was checked for five cycles under the optimal reaction conditions. No significant loss of the product yield was observed.