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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >PREPARATION, CHARACTERIZATION AND MICROCALORIMETRIC STUDIES OF NICKEL-IRON HYDROTALCITES AND THEIR DECOMPOSITIONS
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PREPARATION, CHARACTERIZATION AND MICROCALORIMETRIC STUDIES OF NICKEL-IRON HYDROTALCITES AND THEIR DECOMPOSITIONS

机译：镍铁水滑石及其分解的制备，表征和微热分析

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摘要

Ni-Fe hydrotalcites with Ni/Fe molar ratios of 1, 2, 3, 6 and 10 were prepared by coprecipitation. TG-DTA results showed that the hydrotalcites decomposed in two stages, corresponding to two endothermic peaks around 200 and 300 degrees C. After calcination at 400 degrees C, the hydrotalcites were converted to NiFeO mixed oxides with high surface areas around 100 m(2)/g, which exhibited the XRD pattern of NiO only. TPR studies of the mixed oxides indicated that the reduction temperatures decreased with increasing Ni content, inconsistent with the in situ Mossbauer spectroscopic results which showed that the mixed oxide (Ni/Fe = 2) was easier to reduce than the Fe2O3 sample. Microcalorimetric adsorption of NH3 and CO2 revealed that the mixed oxide (Ni/Fe = 2) displayed intermediate acidity and basicity between those of the pure oxide NiO and Fe2O3. The mixed oxides after calcination at 800 degrees C possessed the phases of NiO and NiFe2O4 with the surface area around 15 m(2)/g, which exhibited moderate basicity with only a little weak acidity. (C) 1997 Elsevier Science B.V. [References: 36]
机译：通过共沉淀制备Ni / Fe摩尔比为1、2、3、6和10的Ni-Fe水滑石。 TG-DTA结果表明，水滑石分为两个阶段分解，对应于200和300摄氏度左右的两个吸热峰。在400摄氏度下煅烧后，水滑石转化为高表面积约100 m（2）的NiFeO混合氧化物。 / g，仅显示NiO的XRD图谱。 TPR对混合氧化物的研究表明，还原温度随Ni含量的增加而降低，这与原位Mossbauer光谱结果不一致，后者表明混合氧化物（Ni / Fe = 2）比Fe2O3样品更易于还原。 NH3和CO2的微量热吸附表明，混合氧化物（Ni / Fe = 2）在纯氧化物NiO和Fe2O3之间显示出中等的酸性和碱性。在800摄氏度下煅烧后的混合氧化物具有NiO和NiFe2O4相，表面积约为15 m（2）/ g，显示出适中的碱度，仅有少量的弱酸性。 （C）1997 Elsevier Science B.V. [参考：36]

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