固体核磁光谱法研究镁铝复合氧化物的水热转化机制
Hydrothermal transformation mechanism of Mg-Al mixed oxides revealed by ~(29)Si and ~(27)Al MAS NMR
查看参考文献18篇
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文摘
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复合金属氧化物广泛分布于自然界,其中镁铝复合氧化物(简称MMO)则大量分布于基性-超基性岩浆岩、蒸发河湖相和海相沉积岩等之中。本研究以镁铝水滑石(HT)煅烧产物MMO为研究对象,采用水热合成方法,通过改变反应时长,考察并揭示MMO在富硅、碱性和160℃水热条件下的结构复原特性及其转化机制。X射线衍射结果显示,该条件下MMO首先复水形成水滑石相,进而水滑石相逐渐向皂石转化,并伴有钠霞石等杂相的形成与溶解。~(29)Si和~(27)Al魔角旋转核磁共振谱(MAS NMR)的结果证明,在皂石结晶过程中,Al~(3+)优先占据四面体片层的四配位位置。该研究对揭示水滑石稳定性、水滑石与硅酸盐矿物异相成核与生长、热液类型的天然皂石矿床的形成过程等具有重要指示意义。 |
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其他语种文摘
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Mixed metal oxides constitute a common kind of material in nature, in which Mg-Al mixed oxide (MMO) is widely distributed in the basic-ultrabasic magmatic rocks, evaporates of rivers-lakes and marine sedimentary rocks. In this study, MMO was obtained by calcining of Mg-Al hydrotalcite. Its rehydration features and the related transformation mechanism in silicic alkaline solution under hydrothermal condition were investigated by changing reaction time. X-ray diffraction (XRD) patterns showed that MMO reconstructed to form hydrotalcite firstly, after that hydrotalcite transformed to saponite gradually, along with the formation and disappearance of impure phase (e. g.,natrodavyn). ~(29)Si and ~(27)Al MAS NMR results suggested that Al~(3+) cations tended to occupy the tetrahedral sites on tetrahedral sheets. The new findings of this research have great significance for understanding the stability of hydrotalcite, heterogeneous nucleation and growth of hydrotalcite and silicate minerals as well as the formation processes of the hydrothermal saponite deposits. |
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来源
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岩石矿物学杂志
,2017,36(6):887-893 【核心库】
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关键词
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镁铝复合氧化物
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皂石
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水热合成
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魔角旋转核磁共振
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地址
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中国科学院广州地球化学研究所, 中国科学院矿物学与成矿学重点实验室;;广东省矿物物理与材料研究开发重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6524 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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中国科学院前沿科学重点研究项目课题
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广东特支计划青年拔尖人才基金项目
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文献收藏号
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CSCD:6110565
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