摘要
以十六烷基三甲基溴化铵(CTAB)为模板剂、通过后处理法合成了介孔结构的Ti-P-Al材料,此类材料无需焙烧即呈现出典型的介孔特征。采用多种表征手段如XRD、FT-IR以及氮气物理吸附等方法考察了磷酸浓度和AlCl3量对所得介孔材料的影响。实验表明:磷酸浓度影响Ti-P介孔结构的长程有序性,但对介孔Ti-P-Al材料的影响很小。AlCl3量对所得介孔结构的影响非常明显,AlCl3量小时得不到介孔材料而AlCl3量大时样品的长程有序性下降。AlCl3量也影响介孔材料中的模板剂含量:在MTP0.25Aly系列样品中,当y=0.7时样品中的模板剂基本没被脱除,因而得到的是无孔材料;当y=7时样品中的绝大部分模板剂已被脱除而得到了介孔材料,所得样品原粉的比表面积为284 m2/g、孔容(v)为0.38 cm3/g、孔径(D)为3.98 nm;进一步增加AlCl3量至y=14时,样品原粉的比表面积高达321 m2/g,孔容和孔径分别为0.39 cm3/g和3.68 nm。
Mesoporous Ti-P-Al materials were synthesized through a post-synthetic method by using cetyltrimethylammonium bromide （CTAB） as the structure directing agent and no calcination was needed during the whole process. The effect of H3PO4 concentration and the AlCl3 amount on the synthesis was characterized in detail byXRD, FT-IR and N2 adsorption methods. It was found that H3PO4 concentration affected the long-range order of the obtained Ti-P mesostructures but showed little influence on the mesostructured Ti-P-Al materials. The AlCl3 amount was the major factor that affected the synthesis. The long-range order of the resulting mesoporous Ti P Al materials decreased with the increasing Al amount. The removal of CTAB with different extent also was found according to the AlCl3 amount. No CTAB was removed when the y value in MTP0.25Aly equaled to 0.7, giving a non-porous material. Most of the CTAB was removed with the y value of 7 and a mesoporous material was thus obtained without calcination, which exhibited a BET surface area of 284 m^2/g, a pore volume of 0.38 cm^3/g and a pore size distribution centered at 3.98nm. Further increasing to 3-14 resulted in a mesoporous material with a higher BET surface area of 321 m^2/g, a pore volume of 0.39 cm^3/g and a pore size of 3.68 nm.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第4期467-471,共5页
Journal of East China University of Science and Technology
