Abstract

This study has been proposed to increase the efficiency of the chemical loop process. Iron oxide doped with cobalt was used as a bifunctional material because of catalyst and oxygen carrier properties and methanol was used as a reducing agent. The co-precipitation method was used to synthesis of Co/Fe oxide. To evaluate the performance of the synthesized catalysts, a microchannel reactor was designed and built with a parallel channel arrangement.To increase H2/coke ratio, the effect of different amounts of cobalt (10, 20, and 30 %) in Fe2O3 catalyst has been investigated. Then, the optimal amount of cobalt concentration was selected for investigation of reduction temperature from 350 to 450 °C.The results showed that increasing the Co concentration to 30 % and increasing the temperature of the reduction step to 450 °C causes the catalytic reactions to start in a shorter time and the process efficiency increases due to the high H2/coke ratio. The repeated cycles investigation of the 0.3CoFe2O4 during 10 redox cycles showed decreased oxidation power and low stability. To enhance the oxidation power and stability, applying two-step reoxidation and adding Zr (30, 40 and 50 %) in the catalyst structure were examined.In the next step, using optimized Zr content (40%), to achieve pure H2 stream for fuel cell applications, the reaction time of the reduction step was optimized. The results showed that during reduction times of 7 min, coke formation was prevented and pure H2 (99.9999%) was produced. Finally, the stability of the 0.3CoFe2O4-ZrO2 during 50 redox cycles in reduction time of 7 min showed that the use of Zr maintains the stability of the catalyst.

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