Magnetic separation and recycling of ferrite nanocatalysts for CO2 decomposition with CH4 recovery from steel industrial flyash
作者： Kuen-Song Lin , Chao-Lung Chiang , Pei-Ju Hsu , Khulan Bat-Erdene , Cheng-Yan Tang
DOI: 10.1016/J.CATTOD.2017.09.024
关键词:
摘要: Abstract Over 0.2 million TPY (ton per year) of hazardous flyash is currently being produced by the steel industry in Taiwan, causing potential environment pollution issues. The decomposition and methanation reactions CO 2 with flowing H over oxygen-deficient recycled ferrites from industrial (RFSIF) nickel ferrite nanoparticles (NFNs) at 300–400 °C 1 atm were studied fine structure Fe/Ni species RFSIF/NFN catalysts investigated. Experimentally, a magnetic separator was used to separate an average separation fraction 74%. Oxygen deficiencies created RFSIF/NFNs reduction . into C O achieved within few minutes upon contact incorporation ferrites. carbon, rather than CO, process. complete possible due high number oxygen catalysts. Fe pre-edge XANES spectra exhibited absorbance feature 7115 eV for 1s-to-3d transition, forbidden selection rule case perfect octahedral symmetry. EXAFS data revealed that present two central atoms coordinated primarily bond distance 1.93 ± 0.02 coordination 4.03. CH 4 during reactivation Moreover, recovery valuable using waste heat off-gas appealing alternative energy recovery. Finally, kinetic thermodynamic parameters decomposition/methanation calculated pseudo first-order model Arrhenius equation, respectively.
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