Synthesis of pure silica ITQ-13 zeolite using fumed silica as silica source

Synthesis of pure silica ITQ-13 zeolite using fumed silica as silica source
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以气相二氧化硅为硅源合成纯二氧化硅ITQ-13沸石

DOI:
10.1016/j.micromeso.2009.10.005
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发表时间:
2010-04
影响因子:
5.2
通讯作者:
Zhu, Xiangxue
Zhu, Xiangxue
中科院分区:
材料科学2区
文献类型:
--
作者:
Li, Xiujie;Xie, Sujuan;Liu, Shenglin;Xu, Guoliang;Xu, Longya;Zhu, Xiangxue

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以气相二氧化硅为硅源,成功合成了纯二氧化硅ITQ-13 (ITH)沸石。与传统的正硅酸四乙酯(TEOS)相比,气相二氧化硅的应用简化了凝胶制备过程,省去了水解过程。在此基础上,研究了反应物H2O/Si比和结晶温度对ITQ-13合成的影响,以及合成和煅烧样品的性能。XRD, SEM, XRF, n2吸附,TGA和TPO-MS结果表明,在低H2O/Si比(7 ~ 8)下获得了结晶良好的ITQ-13沸石。ITQ-13沸石初生晶体呈片状,随着结晶温度的升高,初生晶体厚度增大。ITQ-13样品表现出优异的热稳定性,特别是在高温下合成的样品。
Pure silica ITQ-13 (ITH) zeolite was successfully synthesized using fumed silica as silica source. Compared with the conventionally used tetraethyl orthosilicate (TEOS), application of fumed silica facilitated the gel-making process as the hydrolysis procedure was omitted. On basis of that, influences of reactant H2O/Si ratios and crystallization temperatures on the synthesis of ITQ-13, as well as the properties of the as-synthesized and calcined samples, were investigated. As evidenced by XRD, SEM, XRF, N2adsorption, TGA and TPO-MS results, well crystallized ITQ-13 zeolites were obtained at low H2O/Si ratios (7∼8). The primary crystals of the ITQ-13 zeolites were in plate-like shape, and the plate thickness increased upon the increasing crystallization temperature. ITQ-13 samples exhibited excellent thermal stability, especially for those synthesized at high temperatures.
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