Physical mixtures as simple and efficient alternative to alloy carriers in chemical looping processes

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• 作者：Amey More and Gö ; tz Veser
• 刊名：AIChE Journal
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：63
• 期：1
• 页码：51-59
• 全文大小：608K
• ISSN：1547-5905

文摘

Chemical looping combustion is a clean combustion technology for fossil or renewable fuels. In a previous demonstration, chemical looping was applied to CO₂ activation via reduction to CO with concurrent production of synthesis gas (CO + H₂) from CH₄ via rationally designed Fe-Ni alloys. Here, it is demonstrated that that a simple physical mixture can even outperform the equivalent alloy based on an intricate gas phase mediated coupling between the two metals: Ni cracks methane to carbon and H₂. The latter then reduces iron oxide carrier, forming steam, which gasifies the carbon deposits on Ni to produce a mixture of CO + H₂, thus regenerating the active Ni surface. It was suggested that the principle demonstrated here—the gas phase-mediated coupling of two solid reactants with distinct functionalities—should be applicable broadly toward oxidation reactions and hence opens a new avenue for rational design of chemical looping processes.