| 纯二氧化钛介孔分子筛的合成与表征 |
| SYNTHESIS AND CHARACTERIZATION OF PURE TiO2 MESOPOROUS MOLECULAR SIEVES |
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| 摘要: 分别用不同链长的烷基磷酸酯和脂肪胺两类不同表面活性剂为模板剂合成了纯二氧化钛介孔分子筛（Ti-TMS1，Ti-TMS2），并用溶剂法代替高温焙烧法成功地脱除了模板剂。用 XRD、TEM等测试手段对这类材料的结构进行了表征，研究了反应条件对所制备样品的结构的影响。结果表明：得到的纯二氧化钛介孔分子筛为较规则的六角堆积排列，孔径为2.7～4.4 nm, 且其纳米孔径大小可以通过改变烷基磷酸酯模板剂的烷基链长而调节。此外还发现，采用的烷基磷酸酯模板剂的烷基链越长，制得的二氧化钛介孔分子筛结构及晶型的完整性越好。进一步的研究表明，模板剂脱除之后，Ti-TMS2结构的晶体完整性和稳定性明显不如Ti-TMS1的好，且Ti-TMS1的介孔结构优于Ti-TMS2的介孔结构。 |
| 关键词: 二氧化钛 介孔材料 分子筛 合成 |
| 基金项目: |
| Abstract: Pure mesoporous TiO2 molecular sieves (Ti-TMS1, Ti-TMS2) were first synthesized with different length chain alkylphosphate and alkylamine surfactants as templates and the templates can be successfully removed by reflux in the EtOH/H2O/KOH solution instead of calcination. The powder X-ray diffraction (XRD) pattern and Transmission electron microscopy (TEM) confirmed that these materials were the hexagonal array of Ti-TMS with different pore sized from about 2.7 to 4.4 nm and the length of the hydrocarbon tail of alkylphosphate can be used to vary the pore size of Ti-TMS, The longer of the hydrocarbon tail of alkylphosphate is, the better the structure and uniformity are. The uniformity and stability of Ti-TMS2 synthesized with dodecylamine as template is obviously inferior to that of Ti-TMS1 prepared using dodecylphosphate and hexadecylphosphate as templates. Furthermore, after the removed of templates, the mesostructure of the sample (Ti-TMS1) templated by alkylphosphate surfactant was preserved to a greater degree than that of the sample (Ti-TMS2) templated by alkylamine surfactant. Several other influences on the structure forming and template removal were also discussed. |
| Keywords: titania mesoporous material molecular sieves synthesis |
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| 戴清,沈迅伟,何农跃,王兴利,袁春伟.纯二氧化钛介孔分子筛的合成与表征[J].无机化学学报,1998,14(4):460-466. |
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