摘要
以阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)作为模板剂,正硅酸乙酯(TEOS)作为硅源,在强碱性条件下,加入过渡金属氧化物偏钨酸铵合成得到WSiOx介孔分子筛,使用乙酰丙酮作为助剂,考察其对孔结构的影响,通过X射线衍射仪(XRD)、N2吸附-脱附、原位红外(FT-IR)、扫描电镜(SEM)表征手段对合成出的WSiOx分子筛的结构性能进行研究。随着W质量分数的增加,介孔特征衍射峰的有序度增加,质量分数大于6%后有序度下降;W的加入没有破坏介孔分子筛的骨架结构。最后的结果得到,最佳W质量分数为5%,模板剂质量分数为1.8%,乙酰丙酮质量分数为9%。平均孔径为4.68 nm,比表面积为966 m2/g。
This thesis emphasised on the synthesis of WSiOx with hexadecyl trimethyl ammonium chloride（CTAB） as template, tetraethyl orthosilicate （TEOS） as silica source, acetylacetone（HAcac） as assistant reagent,the modification of WSiOx was achieved by the route of one step in-situ to get the material loaded with transitional metal ammonium tungstate in neutral conditions. The characterization of WSiOx material was investigated by X-ray diffraction （XRD）, N2 adsorption-desorption isotherms, FT-IR spectra,Scanning Electronic Microscope （SEM） analysis. The order degree of molecular mesoporous material was increased with the W content increasing to 6% ;the calicination can not bring the pore to collapse;the pore performance was changed by the W addition,also,the W cannot destroy the molecular mesoporous sieve framework. The result showed that, the optimum W content is 5%, template is 1.8% ,HAcac is 9% ,the average pore diameter is 4. 68 nm,the BET surface area is 966 m^2/g.
出处
《化工科技》
CAS
2009年第6期44-47,共4页
Science & Technology in Chemical Industry
