| 镍铁水滑石及其衍生混合氧化物的制备和表征 |
| PREPARATION AND CHARACTERIZATION OF NICKEL-IRON HYDROTALCITES AND THEIR DERIVED MIXED OXIDES |
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| 摘要: 采用共沉淀法合成了Ni/Fe摩尔比为1、2、3、6和10的NiFe水滑石。热重-差热结果显示NiFe水滑石的分解有二个过程，分别对应于200℃和300℃的吸热峰。经400℃焙烧后，NiFe水滑石转变为具有较高表面积的NiFeO混合氧化物(约100 m2/g)，其XRD结果仅显示NiO的衍射峰；经800℃焙烧后，NiFeO仍有15 m2/g左右的表面积。穆斯堡尔谱测定表明NiFeO混合氧化物较Fe2O3易还原。 |
| 关键词: NiFe水滑石 NiFeO混合氧化物 结构表征 热分析 还原 |
| 基金项目: |
| Abstract: A series of NiFe hydrotalcites with Ni/Fe molar ratios of 1,2,3,6 and 10 was synthesized by coprecipitation. TG-DTA results showed that the decomposition of the hydrotalcite samples proceeded in two stages, corresponding to the two endothermic peaks around 200℃ and 300℃, respectively. After calcination at 400℃, the hydrotalcites were transformed into NiFeO mixed oxides with high surface areas around 200 m2/g. The mixed oxides thus formed exhibited the same XRD patterns as that of NiO. The mixed oxides still possess the surface area of about 15 m2/g even after calcination at 800℃, higher than that of NiFeO synthesized by the conventional method of coprecipitation. XRD and Moessbauer spectroscopy revealed that Fe3+ cations highly distributed in the lattice of the mixed oxides. In situ M?essbauer spectroscopy showed that the mixed oxides can be reduced to NiFe alloy at 300℃ in H2. |
| Keywords: NiFe hydrotalcite NiFeO mixed oxide structure characterization thermal analysis reducibility |
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| 屠迈,沈俭一,王谷丰,陈懿.镍铁水滑石及其衍生混合氧化物的制备和表征[J].无机化学学报,1997,13(2):159-163. |
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