科研之友
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摘要
Effect of calcination temperature on Co-based catalysts was studied in order to evaluate the modifications in structural and catalytic properties for catalytic reforming of CH4 with CO2. In this regard, two sets of mono (i.e., CeO2 and ZrO2) and mixed nano-supported (i.e., CeO2-ZrO2) cobalt-based catalysts, calcined at two different temperatures (500 and 900 degrees C), were prepared. To evaluate the catalytic activity of the prepared catalysts, CO2-CH4 reforming reaction was performed in a micro tubular reactor under atmospheric conditions (1 atm) and at different reaction temperatures ranging from 450 to 800 degrees C. For stability evaluation, the time on stream experiments, under similar reaction conditions, was conducted at 700 degrees C for 9 h. Furthermore, for selected catalysts the effect of reactants feed ratio (CO2/CH4) and gas space velocity (GSV) were also studied. Various techniques such as N-2 adsorption-desorption isotherm, temperature-programmed reduction (TPR), temperature-programmed desorption (TPD), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were used to characterize the prepared catalysts. It was found that the use of a specific calcination temperature in the pretreatment step had a strong influence on catalytic activity, stability, and amount of carbon deposition over catalyst surface in the dry reforming of methane. Additionally, the study revealed that the catalysts calcined at 500 degrees C had better activity and stability than those calcined at 900 degrees C.
- 出版日期2015-2
