晶化后冷却方式诱导形成不同结构的微孔材料  

Cooling Ways Lead to Distinct Structures of Some Microporous Materials after Crystallization

作　　者：马延风 许雅群 李林杰 任元[2] 李牛[2] Ma Yanfeng;Xu Yaqun;Li Linjie;Ren Yuan;Li Niu(Institute of Polymer,College of Chemistry,Nankai University,Tianjin 300071,China;Institute of New Catalytic Material Science,School of Materials Science and Engineering,Nankai University,Tianjin 300071,China)

机构地区：[1]南开大学材料科学与工程学院,新催化材料科学研究所,天津300071 [2]南开大学化学学院,高分子材料化学研究所,天津300071

出　　处：《南开大学学报（自然科学版）》2021年第6期90-99,共10页Acta Scientiarum Naturalium Universitatis Nankaiensis

基　　金：Supported by the Natural Science Foundation of Tianjin(16JCYBJC20000)。

摘　　要：乙二胺(EDA)导向的磷酸钴和1,2-二氨基丙烷(PDA)导向的磷酸锌水热晶化产生了一个有趣的结果,晶化产物受反应釜降温冷却速率支配.为了理解这种现象背后的原因和机制,这两个系统各自在不同温度下结晶1-6 d,然后分别采用快速冷却(10 min)或缓慢冷却(3 h)路线.结果表明,在一定的结晶时间范围内,缓慢的冷却会导致骨架转变.研究表明,这种转变在EDA-CoPO_(4)体系中是低温优选的,缓冷过程使系统有一段时间在较低温度下进行转变.然与PDA-ZnPO_(4)体系中转变则与大多数晶体的转变规律一致,更高温度有利于转变,SAPO-CHA分子筛合成体系中的进一步研究也得到了类似的结果,这个结果突显了EDA-磷酸钴系统结晶的特别之处.An interesting result with the products of crystallization being dominated by the cooling rate has been raised in the crystallization of ethylenediamine(EDA)-directed cobalt phosphates and 1,2-diaminopropane(PDA)-directed zinc phosphates. To explore the reason and mechanism behind this phenomenon,these two systems were crystallized under different temperatures from 1 to 6 d followed by fast cooling(in 10 min) or slow cooling(in 3 h) route, respectively. The results showed that, within a certain range of crystallization time, slow cooling rate would result in a framework transformation. Further investigation indicates that this transformation is lower-temperature-preferable in EDA-CoPO_(4) system, and the slow cooling process give the system a period of time to carry out the transformation under lower temperature.However, in PDA-ZnPO_(4) system, a higher-temperature-preferable transformation has been found, and further study on SAPO-CHA presents a similar result, which is in consistent with general transformation conditions of most crystals, which protrudes the uniqueness of EDA-directed crystallization of cobalt phosphates systems.

关 键 词：晶化 微孔材料 冷却速率 乙二胺-磷酸钴 1 2-丙二胺-磷酸锌 

分 类 号：O643[理学—物理化学]