同多钨酸根柱撑镍铝水滑石的原位合成  

In-situ synthesis of polytungstate anion-pillared Ni-Al hydrotalcite

作　　者：王立庆[1] 刘洪涛[1] 李秀艳[2] 傅吉全[2] 徐春艳[1] 

机构地区：[1]北京化工大学理学院,北京100029 [2]北京服装学院材料工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2008年第2期24-28,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：中国石油天然气股份有限公司资助项目(06-03C-01-02-02)

摘　　要：采用原位沉积法在γ-Al2O3表面原位合成了对苯二甲酸阴离子柱撑的镍铝水滑石,并用同多钨酸根阴离子部分交换了镍铝水滑石中的对苯二甲酸阴离子。用XRD,BET,FT-IR和TG-DTA等测试方法对材料进行表征。结果表明,经过同多钨酸根阴离子的交换以后,垂直于水滑石层板方向的平行层板方向的晶格参数(c)值变小,平行层板方向的晶格参数(a)值不变,(003)、(006)、(009)衍射峰处的层间距(d)值比为3:2:1;交换过程没有改变水滑石的结构,水滑石原位生长在γ-Al2O3表面及内孔,比表面积由γ-Al2O3载体的219m2/g增加到247m2/g,孔径分布则由原来的2～11nm变化为3～4nm。A terephthalate anion-pillared Ni-Al hydrotalcite-like layered double hydroxide （LDH） was synthesized on the surface and within the pores of T-A1203 by in situ crystallization and a polytungstate anion-pillared hydrotalcite was subsequently obtained by ion-exchange. The materials were characterized by XRD, BET, FT-IR and TG-DTA. XRD indicated that the replacement of the terephthalate anion by the polytungstate anion had little effect on the structure. FT-IR spectra suggested that a strong interaction was present between γ-Al2O3 and the hydrotalcite. N2 adsorption measurements showed that the surface area of the LDHs/γ-Al2O3 composite was 247 m^2/g, higher than that of γ-Al2O3（219 m2/g）, whilst the pore diameter （3- 4 nm） was lower than that of γ-Al2O3（2 - 11 nm）. Therefore, it can be concluded that nanosized crystals of LDHs are located on both the surface and within the pores of γ-Al2O3. The properties of the material make it a good candidate for a hydrodesulfurization catalyst.

关 键 词：同多钨酸根阴离子 水滑石 原位合成 离子交换 

分 类 号：O643.3[理学—物理化学]