The cyclic redox scheme facilitated by the Fe-substituted hexaaluminates allows autothermal operation and higher olefin yields relative to the endothermic steam-cracking process. In the present work, Fe-substituted barium hexaaluminates (BaFe xAl 12– xO 19) were investigated as oxygen carriers, or redox catalysts, to convert n-hexane to olefins via ROC. To address these challenges, we proposed a chemical looping approach to convert naphtha into olefins via a redox oxidative cracking (ROC) process.
Coke formation in the steam cracker tubes represents another obstacle. However, the highly endothermic nature of steam generation and the cracking reactions make this process highly energy- and CO 2-intensive. Light olefins such as ethylene and propylene are critical building blocks in the chemical industry and are currently produced mainly from steam cracking of naphtha.
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