本文關(guān)鍵詞： 溶致液晶 介孔氧化鋁 表面活性劑 模板法　出處：《內(nèi)蒙古工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：介孔氧化鋁是一種優(yōu)于傳統(tǒng)氧化鋁新興材料,因其具有比表面積大、孔徑分布集中、熱穩(wěn)定性高、易于參雜、可負載多種金屬等特性,越來越多的被用于催化、吸附分離、生物醫(yī)藥等領(lǐng)域。溶致液晶模板法是軟模板法的一種,用溶致液晶模板法制取介孔材料,易于操作,粒度可控,通過改變模板可以改變粒子型態(tài)、產(chǎn)物形貌及比表面積,是近年來研究的熱點。本文采用溶致液晶模板法制備介孔氧化鋁,分別構(gòu)建SDS/C5H11OH/H2O和CTAB/C10H21OH/H2O三元體系的溶致液晶模板�？疾炝吮砻婊钚詣舛�、助溶劑濃度以及二次水含量對溶致液晶相結(jié)構(gòu)的影響。在SDS:C5H11OH=8:2,二次水含量為50%的比例下,SDS/C5H11OH/H2O呈現(xiàn)層狀的溶致液晶相;在CTAB:C10H21OH=5:5,二次水含量為60%的比例下,CTAB/C10H21OH/H2O呈現(xiàn)層狀的溶致液晶相,由于在SDS/C5H11OH/H2O體系下形成的溶致液晶相分布均勻,確定采用SDS/C5H11OH/H2O體系作為模板以氯化鋁為鋁源,氨水為沉淀劑,替代體系中的水,考察了鋁源的濃度、沉淀劑的質(zhì)量分數(shù)對模板形成的影響以及焙燒溫度對氧化鋁形貌的影響。焙燒溫度過高,導致孔坍塌,不利于結(jié)晶。采用熱重(TG-DSC)、X-射線衍射儀(XRD)、紅外光譜儀(FTIR)、比表面積測定儀(BET)、掃描電子顯微鏡(SEM)等測試手段進行表征。研究結(jié)果表明,XRD和FTIR測試結(jié)果表明制備的樣品為氧化鋁,在氯化鋁濃度為0.5mol/L、氨水質(zhì)量分數(shù)為25%時能夠得到層狀的溶致液晶相。焙燒溫度為700℃的條件下得到樣品為γ-Al2O3,BET測定該樣品的平均孔徑為6.5nm,比表面積為400 m2/g左右,達到介孔物質(zhì)的要求。
[Abstract]:Mesoporous alumina is a better material than traditional alumina, because of its large specific surface area, concentrated pore size distribution, high thermal stability, easy to be mixed, and can be loaded with many kinds of metals, it is more and more used in catalysis, adsorption and separation. Lyotropic liquid crystal template is a kind of soft template method. Mesoporous materials can be prepared by lyotropic liquid crystal template method, which is easy to operate and can be controlled in size. By changing the template, the particle shape, product morphology and specific surface area can be changed. In this paper, mesoporous alumina was prepared by lyotropic liquid crystal template method. The lyotropic liquid crystal templates of SDS/C5H11OH/H2O and CTAB/C10H21OH/H2O ternary systems were prepared respectively. The concentration of surfactant was investigated. Effects of the concentration of cosolvent and the content of secondary water on the structure of lyotropic liquid crystal phase. SDS / C _ 5H _ (11) H / H / H _ 2O presents a layered lyotropic liquid crystal phase at the ratio of 8: 2 and 50% of SDS / C _ 5H _ (11) H / H _ 2O, and at the ratio of CTAB / C _ (10) H _ (21) H _ (5) / H _ (5) and C _ (TAB) / C _ (10) H _ (11) H / H / H / H / H / H / H / H / H _ 2O, the liquid crystal phase appears as layered lyotropic liquid crystal phase. Due to the uniform distribution of lyotropic liquid crystal phase formed in SDS/C5H11OH/H2O system, the concentration of aluminum source was investigated by using SDS/C5H11OH/H2O system as template, aluminum chloride as aluminum source and ammonia water as precipitant, instead of water in the system. The influence of the mass fraction of precipitator on the formation of template and the effect of calcination temperature on the morphology of alumina. TG-DSC-X- ray diffractometer, FTIR, BET and SEM were used to characterize the samples. The results showed that the samples prepared were alumina. The lamellar lyotropic liquid crystal phase can be obtained when the concentration of aluminum chloride is 0.5 mol / L and the mass fraction of ammonia water is 25. The average pore size of the sample is 6.5 nm and the specific surface area is about 400 m2 / g when the calcination temperature is 700 鈩，

本文編號：1552407