نوع مقاله : مقاله پژوهشی
گروه شیمی، دانشکده علوم پایه، دانشگاه کردستان، سنندج، ایران
عنوان مقاله [English]
In this study, porous catalysts based on CuO were synthesized using templates of 3D cubic mesoporous silica-type (KIT-6) and copper nitrate as CuO source via nanocasting strategy and nitrate combustion method. Silica templates with a carbon layer on inner structure (KIT-6@C) or deposited on graphene sheets (KIT06@C/G) were prepared through calecination and carbonization of primery surfactans amd graphen oxides in inert atmosphere. The morphology, elemental analysis and structural properties of the templates and catalysts were characterized by means of X-ray diffraction, energy-dispersive X-ray spectroscopy, scaning electron and transmission electron microscopy and nitrogen adsorption–desorption (BET) techniques. The findings indicated that the cubic structure formed in templates and the resulting catalysts have monoclinic crystalline structure and pure of CuO and to some extent, have negative replica structures of cubic silica template. The results of BET for m-CuO@C/G showed that the catalyst has porous structure with some disordered regions, which constructes from meso and macro pores with specific surface area 50.0 m2 g-1 and averaged pores size 4.8 nm. The catalytic activity of m-CuO@C/G towards thermal decomposition of ammonium perchlorate (AP) was investigated by technique of differential scanning calorimetry. With the addition of 2 and 5 wt% of m-CuO@C/G catalyst, the temperature of high decomposition temperature of AP was reduced by 82.6 and 88.5 °C, and the values of their specific heat releases for AP decomposition were increased 2 (820 J g-1) and 2.5 (1085 J g-1) folds of that for pure AP, respectively.