Synthesis of ordered Ca- and Li-doped mesoporous silicas for H(2) and CO(2) adsorption at ambient temperature and pressure.
Synthesis of ordered Ca- and Li-doped mesoporous silicas for H(2) and CO(2) adsorption at ambient temperature and pressure.
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DOI：
10.1039/c8ra05772a
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发表时间：
2018-10-10
期刊：
影响因子：
3.9
通讯作者：
Cho, Eun-Bum
中科院分区：
文献类型：
--
作者：
Pal, Nabanita;Kim, Taeyeon;Park, Jae-Seo;Cho, Eun-Bum
以十六烷基三甲基溴化铵（CTAB）为表面活性剂，在碱性介质中成功制备了钙和锂掺杂介孔二氧化硅。溶胶-凝胶合成和水热处理制备了高度有序的介孔钙和锂负载二氧化硅颗粒。采用小角x射线散射（SAXS）、透射电子显微镜（TEM）和氮气吸附分析对Ca-硅和li -硅的MCM-41型介观结构、孔隙率、孔径和表面积进行了深入研究。利用电感耦合等离子体原子发射光谱（ICP-AES）和场发射扫描电子显微镜（FESEM）对不同Li和Ca加载量制备的样品进行了进一步的分析，证实了Ca的含量相当大，而Li的含量却不足。此外，在常温（25°C）和压力（1 atm）下，使用热重分析仪（TGA）对这些金属负载二氧化硅的H2和CO2气体吸收进行了研究。记录了掺钙二氧化硅对H2的吸收率高达10 mmol g−1。以纯金属- mcm -41和载胺二氧化硅为原料，采用纯N2气体和CO2/N2和H2/N2混合流动，测试了其CO2和H2的选择性。用Ca-MCM-41材料研究了温度对CO2吸收的影响。采用表面活性剂介导的溶胶-凝胶法合成了介孔掺钙和锂的二氧化硅材料，材料在室温和常压下表现出显著的H2吸附能力。
Ca- and Li-doped mesoporous silicas have been prepared successfully using cetyltrimethylammonium bromide (CTAB) surfactant in basic media. Sol–gel synthesis and hydrothermal treatment produced highly ordered mesoporous Ca and Li loaded silica particles. The MCM-41 type mesostructures, the porosity, the pore sizes as well as the surface area of Ca- and Li-silicas have been thoroughly investigated using small angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and N2 sorption analysis. Samples prepared with varying amounts of Li and Ca loading have been further analyzed using inductive coupled plasma-atomic emission spectroscopy (ICP-AES) and field-emission scanning electron microscopy (FESEM) with an energy dispersive spectral attachment (EDS), which confirmed quite a large amount of Ca while the amount of Li was not enough. Additionally, H2 and CO2 gas uptake studies of these metal-loaded silicas have been carried out using a thermogravimetric analyzer (TGA) at normal temperature (25 °C) and pressure (1 atm). H2 uptake of up to 10 mmol g−1 by Ca-doped silica was recorded. CO2 and H2 selectivity were tested with both pure metal-MCM-41 and amine loaded silica using pure N2 gas and a mixed flow of CO2/N2 and H2/N2. The effect of temperature on CO2 uptake was also studied using Ca-MCM-41 materials. Mesoporous Ca- and Li-doped silica materials have been synthesized in a surfactant mediated sol–gel method and the materials showed significant H2 uptake capabilities at ambient temperature and pressure.
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DOI：
10.1007/s13762-017-1507-8
发表时间：
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影响因子：
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作者：
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