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通过系统考察了超临界温度,采用醇-水溶液加热法结合超临界流体干燥技术制备了Ni_(0.5)Zn_(0.5)Fe_2O_4铁氧体气凝胶,对其进行了X-射线晶体衍射、低温N_2吸脱附、振动样品磁强等各项表征。结果表明,所得铁氧体气凝胶均为单一的尖晶石构型,并且同时兼具强的比饱和磁化强度以及高比表面积。之后氢气还原为氧缺位的铁氧体,进行CO_2甲烷化实验。结果表明,铁氧体可在300℃将CO_2加氢生产甲烷的转化率较高,选择性为100%。
The supercritical temperature was systematically investigated. Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite aerogels were prepared by alcohol-water solution heating combined with supercritical fluid drying. The X-ray crystallography, low temperature N 2 Absorption and desorption, vibrating sample magnetism and other characterization. The results show that the resulting ferrite aerogels are single spinel structure, and at the same time both strong specific saturation magnetization and high specific surface area. After the reduction of hydrogen to oxygen vacancy ferrite, CO2 methanation experiments. The results show that the ferrite can convert methane to hydrogen at 300 ℃ with high conversion and selectivity of 100%.