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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Destructive Adsorption of Carbon Tetrachloride on Alkaline Earth Metal Oxides
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Destructive Adsorption of Carbon Tetrachloride on Alkaline Earth Metal Oxides

机译：碱土金属氧化物对四氯化碳的破坏性吸附

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摘要

The destructive adsorption of CCl↓(4) on MgO, CaO, SrO, and BaO has been studied as a function of the reaction temperature and the amount of CC1↓(4) injected. The reaction was followed using in situ Raman spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and ↑(13)C magic angle spinning nuclear magnetic resonance spectroscopy. It was found that the activity toward CC14 parallels the basicity of the alkaline earth metal oxide; i.e., the activity decreased in the order BaO > SrO > CaO > MgO. Barium oxide readily reacted with CCl↓(4) at 200-300 ℃, and, at these low temperatures, CO↓(2) was the only gas-phase product that evolved from the surface. At higher reaction temperatures, other alkaline earth metal oxides, such as CaO and MgO, also became active, and COC1↓(2) was found to be a reaction intermediate in the destruction of CC1↓(4). Although the destruction process is initiated at the surface, the continuous O↓2-/C1↑(-) exchange results in the bulk transformation of the metal oxide to the metal chloride. Barium oxide could be regenerated by dissolving the chloride in water, followed by precipitation as barium carbonate and subsequent calcination. In addition, carbon tetrachloride destruction at around 600 ℃ resulted in the formation of an unusual alkaline earth metal oxide chloride, viz., M↓(4)OC1↓(6) (M = Ba, Sr, or Ca).
机译：研究了CCl↓（4）在MgO，CaO，SrO和BaO上的破坏性吸附与反应温度和注入的CC1↓（4）量的关系。使用原位拉曼光谱，X射线光电子能谱，傅立叶变换红外光谱和↑（13）C幻角旋转核磁共振光谱对反应进行跟踪。发现对CC14的活性与碱土金属氧化物的碱度平行。即，活性以BaO＞ SrO＞ CaO＞ MgO的顺序降低。氧化钡在200-300℃容易与CCl↓（4）反应，在如此低的温度下，CO↓（2）是唯一从表面析出的气相产物。在更高的反应温度下，其他碱土金属氧化物（例如CaO和MgO）也变得有活性，并且发现COC1↓（2）是破坏CC1↓（4）的反应中间体。尽管破坏过程是从表面开始的，但连续的O↓2- / C1↑（-）交换导致金属氧化物整体转化为金属氯​​化物。可以通过将氯化物溶解在水中，然后沉淀为碳酸钡并随后煅烧来再生氧化钡。另外，在600℃左右四氯化碳的破坏导致形成了一种不寻常的碱土金属氧化物氯化物，即M↓（4）OC1↓（6）（M = Ba，Sr或Ca）。

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