CXN天然沸石的研究 V.结构超稳化  

Studies on CXN Natural Zeolite V.Ultra-stabilization of Structure

作　　者：钟鹰[1] 程晓维[1] 郭娟[1] 黄强 龙英才[1] 

机构地区：[1]复旦大学化学系上海市分子催化与新材料重点实验室 [2]中非地质工程勘查研究院,北京100010

出　　处：《化学学报》2005年第8期720-724,共5页Acta Chimica Sinica

摘　　要：以离子交换结合控制焙烧的方法分别制得结构超稳化高硅H-STI-I 和H-STI-II 沸石. EDX, Si MAS NMR, Al 29 27MAS NMR, FT-IR 等表征证明, 其骨架硅铝原子比分别为4.43 和10.62. 分段程序升温焙烧后的沸石样品经粉末XRD表征表明, 其结构热稳定性达到1000 ℃以上. 结构稳定化沸石呈现反映微孔特性的I 型吸附等温线, 吸附孔道完美、开放. 经历过酸处理的H-STI-II 沸石, 结构缺陷增多, 其热稳定性、比表面积及孔容积略低于H-STI-I.The samples of ultra-stable high-silica H-STI-I and H-STI-II zeolites were prepared using the method of ion-exchange combined with controlled calcinations. Characterizations with EDX, Si-29 MAS NMR, Al-27 MAS NMR and FT-IR indicate that the framework Si/Al ratios of H-STI-I and H-STI-II are 4.43 and 10.62, respectively. Investigations of the samples obtained in the processs of stage-temperature-programmed calcinations with XRD proved that the structure stability of both samples could be kept at temperature up to 1000 degrees C. Type I isotherms of N-2 adsorption at 77 K illuminated that the ultra-stable H-STI samples possessed perfect channel systems with opening micro-pore structures. The more structural defects in the framework of H-STI-II, which has been treated with acid in the process of preparation, led to worse thermal stability, lower surface area and pore volume than those of H-STI-I.

关 键 词：天然沸石 焙烧方法 化学结构 改性技术 热稳定性 结晶度 共振频率 硅 

分 类 号：O643.38[理学—物理化学]