运用吡啶吸附-拉曼光谱探测硅藻土表面酸位  

The surface acid sites of diatomite detected by pyridine-Raman spectrometry

作　　者：袁鹏[1] 吴大清[1] 王德强[1] 何宏平[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《岩石矿物学杂志》2003年第1期61-64,共4页Acta Petrologica et Mineralogica

基　　金：广东省自然科学基金资助项目 ( 970 74 80 0 0 911);厦门大学固体表面物理化学国家重点实验室开放基金资助项目 ( 9911)

摘　　要：运用吡啶吸附 -拉曼光谱技术探测了硅藻土及其热处理产物的表面固体酸位。结果表明 ,室温下硅藻土表面羟基均为吸附水覆盖 ,不显B酸性 ,结构中也无能够接受电子对的Lewis酸位。经热处理后 ,某些酸性羟基脱水使硅藻土呈弱B酸性 ,B酸位浓度在经 650℃左右热处理后达到最大 ;另一方面 ,硅藻土中所含粘土矿物在 650℃左右因脱羟而发生结构变化 ,产生配位不饱和的Al位 。In this study, pyridine_Raman spectrometry was used to study surface acid site properties of diatomite. In the experiment, the surface hydroxyl groups could not play the role of Brnsted acid sites without thermal treatment because they were all covered with water molecules,and there appeared no Lewis acid sites either. After being heated, some B acid sites appeared on diatomite surface, which originated from the surface acid hydroxyl groups that had desorbed water molecules, and the B acid sites reached the maximum quantity after being heated at some 650℃. Under the same treatment condition, L acid sites also appeared, and this was attributed to the structural deformation of clay minerals in diatomite.

关 键 词：吡啶吸附—拉曼光谱 硅藻土 表面酸位 

分 类 号：P578.494[天文地球—矿物学] P575.4[天文地球—地质学]