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One-pot sol–gel synthesis of amine hybrid titania/silsesquioxane composite aerogel for CO2 capture

  • Invited Paper: Sol-gel and hybrid materials with surface modification for applications
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Abstract

Amine hybrid titania/silsesquioxane composite aerogel (AHTSA) was prepared by an one-pot sol–gel process without any catalyst. The sol-gel reaction mechanism of AHTSA was proposed. The use of 3-aminopropyltriethoxysilane (APTES) plays as an “internal catalyst” and promotes the formation of gel during sol–gel process. The morphology, microstructure, pore structure and CO2 capture performances of AHTSA were investigated. AHTSA exhibits microstructure of the typical silica aerogels with colloidal structure. Moreover, AHTSA has a large number of macropores which favor the CO2 adsorption. Thermogravimetric analysis reveals that AHTSA has a high CO2/N2 selectivity in CO2/N2 mixture gas. CO2 adsorption capacity with dry and humid 1 vol% CO2 is as high as 4.19 and 5.04 mmol/g, respectively. Correspondingly, amine efficiency under dry and humid conditions is 0.37 and 0.44, respectively. AHTSA has very short adsorption halftime below 4 min, and its CO2 adsorption capacity do not show obvious attenuation after 30 adsorption-regeneration cycles, indicating AHTSA is a dynamic and regenerable sorbent.

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Acknowledgements

The authors acknowledge the supports from the National Natural Science Foundation of China (51602151), the Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)—China, the Natural Science Foundation of Jiangsu Province—China (BK20161003), the Natural Science Research Project in Colleges and Universities of Jiangsu Province—China (16KJB430014), and the Open Fund of Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province (2016B02)—China.

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Authors and Affiliations

  1. Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province (China University of Mining and Technology), Xuzhou, 221008, China

    Yong Kong

  2. College of Materials Science and Engineering, Nan**g Tech University, Nan**g, 210009, China

    Yong Kong, Jiayue Zhang & **aodong Shen

  3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nan**g, 210009, China

    Yong Kong & **aodong Shen

  4. State Key Laboratory of Materials-Oriented Chemical Engineering, Nan**g, 210009, China

    **aodong Shen

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  1. Yong Kong
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  2. Jiayue Zhang
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Correspondence to Yong Kong or **aodong Shen.

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Kong, Y., Zhang, J. & Shen, X. One-pot sol–gel synthesis of amine hybrid titania/silsesquioxane composite aerogel for CO2 capture. J Sol-Gel Sci Technol 84, 422–431 (2017). https://doi.org/10.1007/s10971-017-4516-7

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  • DOI: https://doi.org/10.1007/s10971-017-4516-7

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