Thermal evolution of carbonate pillared layered hydroxides with (Ni, L) (L = Fe, Co) based slabs: grafting or nongrafting of carbonate anions?
Thermal evolution of carbonate pillared layered hydroxides with (Ni, L) (L = Fe, Co) based slabs: grafting or nongrafting of carbonate anions?
复制标题
DOI：
10.1021/ic025542r
复制
发表时间：
2002-12
影响因子：
4.6
通讯作者：
C. Vaysse;L. Guerlou-Demourgues;C. Delmas
中科院分区：
文献类型：
--
作者：
C. Vaysse;L. Guerlou-Demourgues;C. Delmas
研究了含(Ni，Co)或(Ni，Fe)基层状碳酸盐阴离子的层状双氢氧化物(LDHs)从室温到300℃的热演化。在200-260℃温度范围内观察到一种新的片层相，其片层间距为6.5-6.6A。红外研究和化学分析结果使我们能够突出碳酸盐阴离子在板材上的单一接枝。热重研究似乎表明，插层水首先消失，然后是碳酸盐阴离子的单一接枝。在200摄氏度的水热处理相中停留会导致水分子的重新嵌入。板间距离确实重新增加到原始材料的值，强化了单字画的假设。
The thermal evolution, from room temperature up to 300 degrees C, of layered double hydroxides (LDHs) with (Ni, Co) or (Ni, Fe) based slabs and containing intercalated carbonate anions, was studied. A new lamellar phase, exhibiting a 6.5-6.6 A interslab distance, was observed in the 200-260 degrees C temperature range. The infrared study and the chemical analysis results allowed us to give prominence to a monografting of carbonate anions to the slabs. The thermogravimetric studies seem to indicate that intercalated water is first lost, followed by a monografting of carbonate anions. A stay in water of the 200 degrees C thermally treated phase leads to a reintercalation of water molecules. The interslab distance indeed reincreases up to the value of the pristine material, reinforcing the hypothesis of the monografing.