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Synthesis of DNL-6 with a High Concentration of Si (4 Al) Environments and its Application in CO2 Separation

Authors

  • Xiong Su,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
    2. Graduate University of Chinese Academy of Sciences, Beijing, 100039 (PR China)
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  • Dr. Peng Tian,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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  • Dong Fan,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
    2. Graduate University of Chinese Academy of Sciences, Beijing, 100039 (PR China)
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  • Prof. Qinghua Xia,

    1. Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062 (PR China)
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  • Yue Yang,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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  • Dr. Shutao Xu,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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  • Dr. Lin Zhang,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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  • Dr. Ying Zhang,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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  • Dehua Wang,

    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
    2. Graduate University of Chinese Academy of Sciences, Beijing, 100039 (PR China)
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  • Prof. Zhongmin Liu

    Corresponding author
    1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
    • Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (PR China), Fax: (+86) 411-84379289
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Abstract

The synthesis of DNL-6 with a high concentration of Si (4 Al) environments [Si/(Si+Al+P)=0.182 mol, denoted as M-DNL-6] is demonstrated. This represents the highest reported concentration of such environments in silicoaluminophosphate (SAPO) molecular sieves. Adsorption studies show that the high Si (4 Al) content in M-DNL-6, with an increased number of Brønsted acid sites in the framework, greatly promotes the adsorption of CO2. M-DNL-6 exhibits a large CO2 uptake capacity of up to 6.18 mmol g−1 at 273 K and 101 kPa, and demonstrates high ratios of CO2/CH4 and CO2/N2 separation. From breakthrough and cycling experiments, M-DNL-6 demonstrates the ability to completely separate CO2 from CH4 or N2 with a dynamic capacity of approximately 8.0 wt % before breakthrough. Importantly, the adsorbed CO2 is easily released from the adsorbent through a simple gas purging operation at room temperature to regain 95 % of the original adsorption capacity. These results suggest that M-DNL-6 can be used as a potential adsorbent for CO2 capture in pressure swing adsorption processes.

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