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环境化学 2015

NiFe2O4直接分解二氧化碳成碳循环反应过程结构演变研究

傅毛生,陈林深,陈诵英

Keywords: 二氧化碳,分解,氧缺位铁酸镍,XRD分析

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Abstract:

用XRDRietveld分析法,对共沉淀法制备的NiFe2O4在H2/CO2循环反应中的结构演变进行研究,发现随着循环反应次数的增加,NiFe2O4物相的含量逐渐降低,FexNi1-x物相的含量及其(200)衍射的平均晶粒逐渐增大,并出现Fe3C物相,其含量增长较快.纯NiFe2O4经15次循环反应后,体系中NiFe2O4物相的含量只剩下5%左右,样品基本失去分解CO2的活性.NiFe2O4掺杂4%铬后,明显提高了NiFe2O4骨架结构的稳定性,虽经50次H2/CO2循环反应,体系中NiFe2O4物相含量仍然有20%,分解CO2的活性仍达到初始活性的40%.

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