乙二胺导向合成的微孔晶体磷酸钴的转化现象  

Phenomenon of Structural Transformation of Ethylenediamine Oriented Synthesis of Microporous Cobalt Phosphate

作　　者：罗倩倩[1] 周世东[1] 任元[1] 李牛[1] 黄志鹏[1] 关乃佳[1] 项寿鹤[1] 

机构地区：[1]南开大学化学学院,先进能源材料化学教育部重点实验室,天津300071

出　　处：《物理化学学报》2013年第5期911-919,共9页Acta Physico-Chimica Sinica

基　　金：天津市自然科学基金(12JCYBJC12700);国家重大基础研究项目(973)(2009CB623502)资助~~

摘　　要：以乙二胺为模板剂(SDA)合成微孔晶体磷酸钴,可以得到多种不同的结构.本文在合成四种不同结构类型的微孔磷酸钴(命名为CoPO-en-1,CoPO-en-2,CoPO-en-3,CoPO-en-4,en为乙二胺的英文缩写)过程中发现,它们之间不仅可以在水热合成条件下相互转化,在焙烧处理条件下也能实现转化.研究发现,在水热合成过程中,CoPO-en-2、CoPO-en-4分别是CoPO-en-1、CoPO-en-3的晶化中间物,在较低晶化温度下或者较高温度的晶化初期,可以发现它们的身影.一旦晶化温度升高或者晶化时间延长,它们就分别转化为CoPO-en-1和CoPO-en-3.在合成产物的热处理过程中发现:CoPO-en-2、CoPO-en-3、CoPO-en-4都能够通过焙烧转化为CoPO-en-1.这种现象表明,几种微孔磷酸钴结构间的稳定性存在递变关系.Abstract： Microporous cobalt phosphate structures can be synthesized using ethylenediamine as a structure directing agent. During the syntheses of CoPO-en-1, CoPO-en-2, CoPO-en-3, and CoPO-en-4, it was found that they could interconvert during hydrothermal or calcination conditions. CoPO-en-2 and CoPO-en-4 are the crystallization intermediates of CoPO-en-1 and CoPO-en-3, respectively. During hydrothermal synthesis, CoPO-en-2 and CoPO-en-4 could be obtained at lower temperature or higher temperature during the initial crystallization stage. Extended synthesis time at higher temperature the two former structures transform into the two latter. CoPO-en-2, CoPO-en-3, and CoPO-en-4 could also convert to CoPO-en-1 during calcination, and these transformations indicated the sequence of structure stability. During synthesis under hydrothermal conditions, CoPO-en-2, CoPO-en-3, and CoPO-en-4 could convert to CoPO-en-1. During muffle furnace roasting, CoPO-en-2, CoPO-en-3, and CoPO-en-4 could also convert to CoPO-en-1. Different structures in the liquid or solid phases could be transformed into the same structure using different approaches.

关 键 词：磷酸钴 乙二胺 结构转化 水热合成 焙烧转化 

分 类 号：O627.8[理学—有机化学]