Abstract
This study aims to optimize the operating conditions for one-step carbon dioxide hydrogenation to light olefins using ternary CuZnZr metal oxide and SAPO-34 zeolite catalysts. The catalyst was prepared using hydrothermal and co-precipitation synthesis, and it was characterized using XRD, TEM, BET, SEM, H2-TPR, and NH3-TPD techniques. The impact of temperature, space velocity, and H2/CO2 ratio on CO2 conversion, olefins selectivity, and CO selectivity was studied using response surface methodology (RSM). The desirability function was used to optimize multiple responses in the CO2 hydrogenation process at the same time. It takes into account the lower and upper limits, as well as the targets for each response, and produces a score that can be used to determine the best experimental conditions. It is possible to maximize CO2 conversion and olefin selectivity while minimizing CO selectivity by analyzing the optimal parameters. The optimal conditions were determined to be 375 °C, a space velocity of 9 L/g.h, and an H2/CO2 ratio of 3. The CO2 conversion rate was 16.56%, the olefins selectivity was 77.24%, and the CO selectivity was 67.91% under these conditions. The hybrid catalyst also demonstrated remarkable stability after 100 h of operation without losing activity. The results of the study show that the CuZZ/SAPO-34 catalyst has the potential to effectively reduce CO2 to light olefins under optimized conditions.
Published Version
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