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La-hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO2 as Sole Oxidant
AIChE Journal ( IF 3.5 ) Pub Date : 2017-09-01 11:05:41 , DOI: 10.1002/aic.15942
Yanyan Zhu 1, 2 , Weiwei Liu 1 , Xueyan Sun 1 , Xiaoxun Ma 1 , Yu Kang 2, 3 , Xiaodong Wang 2 , Junhu Wang 2
Affiliation  

Chemical looping partial oxidation of methane using a sole CO2 oxidant (CL-POM-CO2) is an emerging technology for synthesis gas generation and CO2 utilization, which is highly dependent on an oxygen carrier (OC). In this work, Fe-substituted La-hexaaluminate as the OC was found to exhibit good reactivity and stability during 50 periodic CH4/CO2 redox cycles due to the formation of magnetoplumbite La-hexaaluminate structure with the introduction of La. Deeper reduction for synthesis gas generation did not destroy the La-hexaaluminate structure via a charge compensation mechanism, which increased CH4 reactivity and further improved CO2 utilization under subsequent re-oxidation. In the La-hexaaluminate structure, O6-Fe3+(Oh) was highly active for the total oxidation of methane, while O5-Fe3+(Tr) and O4-Fe3+(Th) selectively oxidized CH4 to synthesis gas. The sole CO2 oxidant only selectively recovered O5-Fe3+(Tr) and O4-Fe3+(Th), and thus is more favorable for improving synthesis gas selectivity than O2/air, which offers an attractive opportunity for CO2 utilization. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译:

La-六铝酸盐,用于以CO2为唯一氧化剂的甲烷化学循环部分氧化制取合成气

使用唯一的CO 2氧化剂(CL-POM-CO 2)对甲烷进行化学循环部分氧化是一种新兴的生产合成气和利用CO 2的技术,该技术高度依赖于氧载体(OC)。在这项工作中,发现铁取代的La-六铝酸盐作为OC在50个周期性的CH 4 / CO 2氧化还原循环中表现出良好的反应性和稳定性,这是由于引入La形成了磁铅石La-六铝酸盐结构。合成气的产生并未通过电荷补偿机制破坏La-六铝酸盐的结构,从而增加了CH 4的反应性并进一步改善了CO 2。在随后的再氧化过程中的利用率。在六铝酸镧结构中,O 6 -Fe 3+(Oh)对甲烷的总氧化具有高活性,而O 5 -Fe 3+(Tr)和O 4 -Fe 3+(Th)选择性氧化CH 4合成气。唯一的CO 2氧化剂仅选择性地回收了O 5 -Fe 3+(Tr)和O 4 -Fe 3+(Th),因此比O 2 /空气更有利于提高合成气的选择性,为O 2 /空气提供了诱人的机会。一氧化碳2利用率。©2017美国化学工程师学会AIChE J,2017
更新日期:2017-09-04
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