پديدآورندگان :
Sadegi Ebrahim Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. , Khatamian Masoumeh Khatamian@tabrizu.ac.ir Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. , Saket Maryam Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. , Fazli Shokouhib Sara Research centre for Advanced Materials and Minerals Processing, Department of Material Engineering, Sahand University of Technology,Tabri
كليدواژه :
composite , CO2 , ethylbenzene , Fe2O3
چكيده فارسي :
Styrene is one of the most precious basic materials which its demands and applications are currently increasingly growing all over the world. Mostly styrene is produced by catalytic dehydrogenation of ethylbenzene at high temperatures in the presence of excess steam. This paper introduces novel composites of K-chromosilicate/Fe2O3 with high performance in oxidative dehydrogenation (ODH) of ethylbenzene to produce styrene with CO2. Regarding K-chromosilicate as catalyst support, various amounts of iron oxide nanoparticles (γ-Fe2O3) were introduced into porous support by solid-stated dispersion (SSD) in order to enhance catalytic activity. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with the energy dispersive analysis–EDX, and N2 physical adsorption analysis. According to the GC results of prepared nanocomposites in ODH reaction, the highest styrene yield, 46.95% with the selectivity of 92.40% belongs to 5F/KCS catalyst (potassium chromosilicate/5% Fe2O3). The relatively high performance of catalytic activity of the samples in ethylebenzene dehydrogenation process can be attributed to the synergistic effect of Cr2O3 and potassium K+ and iron Fe3+ ions in the structure of catalysts.
