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摘要: 采用柠檬酸络合法制备NiFe2O4，运用XRD、DTA-TG等手段对其结构进行表征，并探讨还原条件对NiFe2O4－δ的结构稳定性及其催化分解CO2成C反应活性的影响。研究结果表明，由柠檬酸络合法制备的NiFe2O4样品量为0.5g时，利用H2还原制备氧缺位NiFe2O4－δ的最佳还原条件为还原温度320℃、氢气流量40mL/min、还原时间3h。还原温度过高、还原时间过长以及氢气流量过大，均会使NiFe2O4－δ还原过度，尖晶石结构瓦解而转变成Fe(Ni)合金和α-Fe等。Abstract: Nickel ferrite, NiFe2O4, with spinel structure was prepared by citrate coordination method. The samples were characterized by X-ray diffraction (XRD) thermal gravimetric analysis (TGA). When the weight of NiFe2O4 sample was 0.5g, the optimum reduction condition for the preparation of oxygendeficient nickel ferrite, NiFe2O4－δ, reduced by H2 was as follows: reduction temperature was 320℃, H2 flow rate was 40mL/min and reduction time was 3h. The results also showed that the higher reduction temperature and higher H2 flow rate as well as longer reduction time led to an excessive reduction of NiFe2O4－δ and the destructiveness of its spinel structure, resulting in the formation of FeNi alloy Fe(Ni) as well as α-Fe phase.
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