固体核磁光谱法研究镁铝复合氧化物的水热转化机制
发布时间:2018-04-19 10:29
本文选题:镁铝复合氧化物 + 皂石 ; 参考:《岩石矿物学杂志》2017年06期
【摘要】: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。29Si和27Al魔角旋转核磁共振谱(MAS NMR)的结果证明,在皂石结晶过程中,Al3+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。
[Abstract]:Composite metal oxides are widely distributed in nature, among which MMOs are widely distributed in basic-ultrabasic magmatic rocks, evaporative river and lacustrine facies and marine sedimentary rocks.In this study, the calcined product of magnesia-aluminum hydrotalcite (MMO) was used as the object of study. The hydrothermal synthesis method was used to investigate and reveal the presence of MMO in silicon-rich products by changing the reaction time.The characteristics of structure recovery and its transformation mechanism at alkaline and 160 鈩,
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