【摘要】 采用共沉淀法制备了Mg2Al1、Zn2Al1和Mg1Zn1Al1LDHs,利用XRD和SEM表征手段,对它们的热分解及焙烧物在Na2CO3溶液中恢复层状结构的能力进行了对比研究。结果表明,在400～700℃温度范围内,Zn2Al1LDH和Mg2Al1LDH的焙烧物中均出现氧化物相(ZnO和MgO)和尖晶石相(ZnAl2O4和MgAl2O4相);而Mg1Zn1Al1LDH的焙烧物中始终以ZnO相为主,仅在700℃时出现微弱的MgAl2O4相。三种焙烧物恢复层状结构的能力为:Mg1Zn1Al1LDO>Mg2Al1LDO>Zn2Al1LDO,其与焙烧物组成有关。原始LDHs和水化LDHs均呈片状。更多还原

【Abstract】 Mg₂Al₁, Zn₂Al₁, Mg₁Zn₁Al₁ hydrotalcite_like materials （LDHs） were synthesized by a coprecipitation method, the thermal decomposition of them and reconstruction of their decomposition products immersed in solution containing Na₂CO₃ were investigated by employing XRD and SEM. Results showed that in the temperature range from 400℃ to 700℃, calcinations of Zn₂Al₁ LDH and Mg₂Al₁ LDH gave rise to oxide phases of ZnO or MgO and spinel phases of MgAl₂O₄or ZnAl₂O₄, but the phase of ZnO were always dominant in the decomposition products of Mg₁Zn₁Al₁ LDH at this temperature range, the reconstruction ability of thermal decomposition products was Mg₁Zn₁Al₁ LDO > Mg₂Al₁ LDHO> Zn₂Al₁ LDO, it was possible related to their components. Original and rehydrated LDHs were sheet.更多还原