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用于在常温常压下吸附氢气和一氧化碳的有序钙掺杂和锂掺杂介孔二氧化硅的合成。

Synthesis of ordered Ca- and Li-doped mesoporous silicas for H and CO adsorption at ambient temperature and pressure.

作者信息

Pal Nabanita, Kim Taeyeon, Cho Eun-Bum

机构信息

Faculty of Science and Technology, The ICFAI Foundation for Higher Education Donthanapally, Shankarapalli Road Hyderabad-501203 India

Department of Fine Chemistry, Seoul National University of Science and Technology 232 Gongneung-ro, Nowon-gu Seoul 01811 Republic of Korea

出版信息

RSC Adv. 2018 Oct 15;8(61):35294-35305. doi: 10.1039/c8ra05772a. eCollection 2018 Oct 10.

DOI:10.1039/c8ra05772a
PMID:35547087
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9087321/
Abstract

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 N 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, H and CO 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). H uptake of up to 10 mmol g by Ca-doped silica was recorded. CO and H selectivity were tested with both pure metal-MCM-41 and amine loaded silica using pure N gas and a mixed flow of CO/N and H/N. The effect of temperature on CO uptake was also studied using Ca-MCM-41 materials.

摘要

在碱性介质中，使用十六烷基三甲基溴化铵（CTAB）表面活性剂成功制备了钙掺杂和锂掺杂的介孔二氧化硅。溶胶 - 凝胶合成和水热处理产生了高度有序的负载钙和锂的介孔二氧化硅颗粒。使用小角X射线散射（SAXS）、透射电子显微镜（TEM）和N吸附分析对钙硅和锂硅的MCM - 41型介观结构、孔隙率、孔径以及表面积进行了深入研究。使用电感耦合等离子体原子发射光谱（ICP - AES）和带有能量色散光谱附件（EDS）的场发射扫描电子显微镜（FESEM）对不同锂和钙负载量制备的样品进行了进一步分析，结果证实钙的含量相当高，而锂的含量不足。此外，使用热重分析仪（TGA）在常温（25℃）和常压（1 atm）下对这些负载金属的二氧化硅进行了氢气和一氧化碳气体吸附研究。记录到钙掺杂二氧化硅的氢气吸附量高达10 mmol/g。使用纯氮气以及一氧化碳/氮气和氢气/氮气的混合气流，对纯金属 - MCM - 41和负载胺的二氧化硅进行了一氧化碳和氢气选择性测试。还使用钙 - MCM - 41材料研究了温度对一氧化碳吸附的影响。

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