Synthesis and thermal properties of ZnAl layered double hydroxide by urea hydrolysis

详细信息    查看全文

• 作者：Jianqiang Liu ; Jianye Song ; Hongdi Xiao ; Liangji Zhang ; Yaowei Qin ; Dehe Liu ; Wanguo Hou ; Na Du
• 关键词：Layered double hydroxide ; Urea hydrolysis ; Mechanism ; Thermal properties
• 刊名：Powder Technology
• 出版年：February, 2014
• 年：2014
• 卷：253
• 期：Complete
• 页码：41-45
• 全文大小：1085 K

文摘

The synthetic zinc aluminum layered double hydroxide (LDH) with Zn/Al molar ratios of 0.25-8 was synthesized by the urea method. The structure, composition and morphological properties were investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM). Pure layered double hydroxide phase was obtained when the Zn/Al ratios are 0.5, 1 and 2. The lower (0.25 and 0.33) and higher (3, 4, 6 and 8) initial Zn/Al molar ratios resulted in the formation of ZnAl-CO₃-LDH with AlOOH and Zn₄(CO₃)(OH)₆路nH₂O, respectively. The thermal properties of these LDHs were studied by the thermogravimetric and differential thermal analysis (TG-DTA). The XRD patterns of the calcined products at 900 掳C showed that the LDHs prepared at different Zn/Al molar ratios can be used as good precursors for preparing mixed oxide or spinel.