Modeling and Optimization of Ethanol to Ethylene Production over gamma-Al2O3 and CeZrO2 Catalysts Using RSM1 Method

摘要

Catalytic performance of catalysts is influenced by process conditions. In this work the influence of temperature, residence time and C2H5OH feed concentration was investigated in ethanol dehydration reaction using the response surface methodology (RSM) for gamma-Al2O3 and CeZrO2 catalysts. The gamma-Al2O3 was prepared using calcination method and CeZrO2 precipitation method. The process indicators (conversion, yield, selectivity) were modeled through the RSM method, and the equations obtained showed a good fit to the experimental data. The optimization results indicate different optimum conditions for each catalyst. For gamma-Al2O3 at 420 degrees C, 23.5 of ethanol concentration and 0.65 gs/L, 0.6 mol(ethylene)/mol(ethanol) is obtained and total conversion. For CeZrO2 at 495 degrees C, 59 ethanol concentration and 300 gs/L, 0.38 mol(ethylene)/mol(ethanol) is obtained and total ethanol conversion. Catalyst characterization was performed using, XRD (x-ray diffraction), BET (Brunauer-Emmett-Teller surface area analysis), TPR (Temperature-programmed reduction) and TPD (Temperature-programmed desorption).