低温开放体系配阴离子对合成硅基铝多孔材料的影响

以十六烷基三甲基溴化铵为模板,六水氯化铝和十八水硫酸铝在低温开放体系分别与正硅酸乙酯直接进行固/液反应,合成非晶结构的铝掺杂氧化硅微介孔材料。并用XRD、HRTEM、SEM/EDS、低温N2吸附、FTIR和原子吸收光谱TAS等技术对产物的结构和吸附性能进行表征。探讨了微介孔的形成机理。结果表明,在酸性和阳离子表面活性剂共存条件下,所制得的铝掺杂氧化硅微介孔材料呈不规则形状,其孔壁均为无定型;掺杂金属铝进入氧化硅晶格。铝源中配阴离子不仅影响材料的物相织构、材料的元素组成,而且还影响其吸附性能。

Effect of Anionic Coordination on Al-containing Silica Porous Material Synthesized at Low Temperature in an Open-vessel

Amorphous structural aluminum-containing silica（Al-SiO 2） micro-/mesoporous materials are directly prepared by solid-liquid reaction between tetraethyl orthosilicate（TEOS） and aluminium chloride hexahydrate（AlCl 3.6H 2O） or aluminium sulfate ocatadecahydrate（Al 2（SO 4）3.18H 2O） with cetyltrimethylammonium bromide（CTAB） as a template agent,respectively.The textural properties of the materials were characterized by the X-ray diffraction（XRD）,high resolution transmission electron microscopy（HRTEM）,scanning electron micrography（SEM）,energy dispersion spectroscopy（EDS）,N2-physisorption at 77K,Fourier transform infrared spectroscopy（FT-IR）.Moreover,the adsorption capacity was determined by atomic absorption spectroscopy instrument.The proposal formation mechanism of Al-doped SiO 2 porous material was investigated.The results show that,in presence of acidity and cation surfactant,aluminum has been incorporated into the lattices of silica and the porous materials obtained are of amorphous pore walls and abnormity shape.Anionic coordination in aluminium sources not only affects the textural structure and composition but also its adsorption capacity.