Syngas production from chemical looping reforming of ethanol over iron-based oxygen carriers: Theoretical analysis and experimental investigation

doi:10.1016/j.cjche.2021.02.012

摘要/Abstract

摘要： Chemical looping reforming (CLR) is a recent trend for syngas production, which has several merits compared to the conventional manner. One of the most important issues for CLR is to find low-cost material as oxygen carriers, so iron is a promising candidate. This paper contributes to testing the thermodynamic ability of iron-based oxygen carrier for chemical looping reforming of ethanol (CLRE). Iron thermodynamically investigated in temperature 100-1300 ℃ and excess oxygen number (Φ) 0-4. It was found that the temperature and Φ have an apparent effect on the gaseous composition produced from the process. Increases in temperature within the range of 100-1300 ℃ enhanced syngas generated and reduced coke formation and CH₄. Whereas, increased Φ, particularly at higher temperatures, had also enhanced syngas production as well as reduced coke formation. However, increasing Φ for values beyond one had decreased syngas and not significantly reduced coke deposition. Moreover, an experimental investigation was carried out in a fixed bed reactor for more in-depth verification of iron ability as an oxygen carrier through using magnetite ore (mainly Fe₃O₄). It found that the effect of temperature on syngas production was consistent with that calculated thermodynamically, as syngas increased with raising the temperature through the CLRE.

关键词: Syngas, Chemical looping reforming, Iron oxygen carrier, Ethanol, Coke formation, Thermodynamic analysis

Abstract: Chemical looping reforming (CLR) is a recent trend for syngas production, which has several merits compared to the conventional manner. One of the most important issues for CLR is to find low-cost material as oxygen carriers, so iron is a promising candidate. This paper contributes to testing the thermodynamic ability of iron-based oxygen carrier for chemical looping reforming of ethanol (CLRE). Iron thermodynamically investigated in temperature 100-1300 ℃ and excess oxygen number (Φ) 0-4. It was found that the temperature and Φ have an apparent effect on the gaseous composition produced from the process. Increases in temperature within the range of 100-1300 ℃ enhanced syngas generated and reduced coke formation and CH₄. Whereas, increased Φ, particularly at higher temperatures, had also enhanced syngas production as well as reduced coke formation. However, increasing Φ for values beyond one had decreased syngas and not significantly reduced coke deposition. Moreover, an experimental investigation was carried out in a fixed bed reactor for more in-depth verification of iron ability as an oxygen carrier through using magnetite ore (mainly Fe₃O₄). It found that the effect of temperature on syngas production was consistent with that calculated thermodynamically, as syngas increased with raising the temperature through the CLRE.

Key words: Syngas, Chemical looping reforming, Iron oxygen carrier, Ethanol, Coke formation, Thermodynamic analysis

Atif Abdalazeez, Wenju Wang, Siddig Abuelgasim. Syngas production from chemical looping reforming of ethanol over iron-based oxygen carriers: Theoretical analysis and experimental investigation[J]. 中国化学工程学报, 2021, 38(10): 123-131.

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