Conversion of Ethane to Ethylene in the Presence of Carbon Dioxide over Cr/ZrO2 Nanocatalyst Synthesized via Precipitation Method

In the present research, effect of preparation method, one of the most significant variables in the alkaneoxidative dehydrogenation, on the properties of the Cr2O3-ZrO2 nanocatalysts was taken in to account. To this aim, theCr-based nanocatalysts were prepared via co-precipitation and combustion methods and tested for the dehydrogenationof ethane in the presence of CO2. The nanocatalysts were characterized by XRD, FESEM, EDX and BET techniques.XRD data confirmed the formation of ZrO2 as the crystalline phase with nano crystallite size for both samples. FESEMimages indicate nanometric particles and uniform particle size distribution for the sample synthesized by co-precipitationmethod. According to the BET analysis, co-precipitation synthesized sample represented the higher surface area. It hasbeen found that the co-precipitation method has the potential to improve catalyst desired properties especially metalsurface dispersion resulting in catalytic performance enhancement. The highest yield of product was obtained at 700°Cfor both of the catalysts. Based on the excellent characterization, co-precipitation synthesized sample exhibited the bettercatalytic activity. In spite of activity decay, C2H4 yield gained higher values in the case of co-precipitation made catalystcompared to combustion one during the 10 h stability test.

کلیدواژه ها:

Precipitation ، Cr/ZrO2 ، Dehydrogenation ، Ethane ، Ethylene