Mg/Zn/Al类水滑石的热分解和水化性能研究  

Study on Thermal Decompositi on of Mg/Zn/Al Hyrotalcite-like Materials and Rehydration of their Decomposition Products

作　　者：张波[1] 郑遗凡[1] 廖江芬[1] 葛忠华[1] 

机构地区：[1]浙江工业大学化学工程与材料学院催化新材料研究所,杭州310014

出　　处：《化学通报》2006年第5期351-354,共4页Chemistry

基　　金：浙江省重点科技攻关计划资助项目(2005C21055)

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。Mg2Al1、Zn2Al1,Mg1Zn1 Al1hydrotalcite-like materials （LDHs） were synthesized by a coprecipitation method, the thermal decomposition of them and reconstruction of their decomposition products immersed in solution containing Na2 CO3 were investigated by employing XRD and SEM. Results showed that in the temperature range from 400℃ to 700℃, calcinations of Zn2Al1 LDH and MgaAl1 LDH gave rise to oxide phases of ZnO or MgO and spinel phases of MgAl2O4 or ZnAl2O4, but the phase of ZnO were always dominant in the decomposition products of Mg1 Zn1 Al1 LDH at this temperature range, the reconstruction ability of thermal decomposition products was Mg1 Zn1 A1; LDO 〉 Mg2 Al2; LDHO 〉 Zn2 Al1; LDO, it was possible related to their components. Original and rehydrated LDHs were sheet.

关 键 词：类水滑石 热分解 水化 层状结构 

分 类 号：O611.3[理学—无机化学]