CO fuel and γ-LiAlO2 production through alkali carbonate-assisted CO2 splitting by reusing aluminum wastes. Issue 39 (July 2020)

• Record Type: Journal Article
• Authors: Li, Peng; Yang, Motong; Chen, Dong; Guo, Hongwei; Yan, Bingji
• Is Part Of: Journal of CO₂ utilization. Issue 39(2020)
• Publication Date: 2020-07
• Subjects: Aluminum scraps -- Alkali carbonate -- Enhancement -- CO generation -- γ-LiAlO2; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2020.101168
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: An innovative alkali carbonate-assisted CO2 splitting process was proposed. The CO generation was significantly enhanced by the addition of Li2 CO3 . Thermal stability of carbonates was correlated to Al/CO2 reaction kinetics. Aluminum wastes and CO2 were converted into CO fuel and γ-LiAlO2 material. Abstract: This study proposes a process of reusing waste aluminum scraps and greenhouse gas CO2 as chemical feedstocks for producing CO gas fuel and γ-LiAlO2 . The non-isothermal kinetics shows that the oxidation of aluminum scraps in CO2 is inhibited once the passive alumina layer being formed at aluminum surface. With the addition of alkali carbonate, the CO generation rate is enhanced depending on the composition of carbonate salt and CO2 concentration. By correlating the thermal stability characteristics of the carbonate with the CO generation features, it is revealed that the as-formed alumina layer is firstly dissolved in the molten salt by means of basic corrosion mechanism and then followed by solid-state reaction with the alkali-metal oxide. By adding Li2 CO3, the conversion rate of aluminum scraps can be significantly improved and is completed in 1 h.