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采用共沉淀法合成了不同摩尔比的碳酸根型水滑石。用X-射线粉末衍射、红外光谱、BET法对它们进行了表征,还测定了四元CuCoMgAl类水滑石和二元MgAl水滑石对氮氧化物(NOx)的吸附性能。结果表明,成功合成的n(Cu):n(Co):n(Mg):n(Al)摩尔比分别为1:1:1:1、1:3:2:2、3:1:2:2的复合氧化物都具有水滑石结构,且晶相完整、结晶度高;随着Co含量增加,水滑石层间高度略有增加。红外光谱分析结果表明羟基和碳酸根被插入到水滑石层问结构。四元CuCoMgAl-HTlcs对NOx吸附性能明显优于二元的Mg3Al-HTlcs,而Cu1.13Co1.07Mg0.94Al-HTlcs对NOx的吸附性能优于其它四元的CuCoMgAl-HTIcs。Cu0.5Co1.55Mg0.95Al-HTlcs和Cu1.57Co0.56MgAl-HTlcs的吸附容量分别为2400、1770 mg/g。
Carbonate hydrotalcites with different mole ratios were synthesized by co-precipitation method. They were characterized by X-ray powder diffraction, FTIR and BET methods. The adsorption properties of quaternary CuCoMgAl hydrotalcite and binary MgAl hydrotalcite to nitrogen oxides (NOx) were also determined. The results showed that the molar ratio of n (Cu): n (Co): n (Mg): n (Al) synthesized successfully was 1: 1: 1: 1, 1: 3: 2: 2, 3: 1 : 2 composite oxide has a hydrotalcite structure, and the crystal phase integrity, high crystallinity; with the increase of Co content, the interlayer of hydrotalcite slightly increased. Infrared spectroscopy analysis showed that hydroxyl and carbonate were inserted into the hydrotalcite interrogation structure. The adsorption of quaternary CuCoMgAl-HTlcs on NOx is better than that of binary Mg3Al-HTlcs, while the adsorption of NOx on Cu1.13Co1.07Mg0.94Al-HTlcs is better than that of other CuCoMgAl-HTIcs. The adsorption capacities of Cu0.5Co1.55Mg0.95Al-HTlcs and Cu1.57Co0.56MgAl-HTlcs were 2400 and 1770 mg / g, respectively.