Abstract
ZK-5 (a KFI-type framework topology) is a “small-pore” zeolite with a three-dimensional channel system with eight-membered ring micropore openings (ca. 0.39 nm). Several recent studies have shown that ZK-5 has the potential to be applied in solid adsorbents or catalysts, particularly in CO2 capture and NOx reduction in industry. However, the quality (e.g. micropore volume) of conventional ZK-5 (0.21–0.22 cm3 g−1) remains smaller than the theoretical micropore volume of the KFI-type framework topology (0.32–0.34 cm3 g−1). Improving the micropore volume of ZK-5 could therefore enhance its performance. In this study, we apply the seed-assisted method to obtain KFI-type zeolite starting by adding conventionally synthesized ZK-5 as a seed into organic structure-directing agent (OSDA)-free K,Sr-aluminosilicate reactants, followed by hydrothermal treatment. The series of experimental characterizations of the obtained products showed that under certain synthesis conditions, the addition of a seed could enhance the micropore volume of KFI-type zeolites to 0.26–0.28 cm3 g−1, which is larger than previously reported for ZK-5. Such enhanced properties led to higher CO2 adsorption capacities for the obtained KFI-type zeolites compared with conventional ZK-5 over a wide range of pressures. A series of experiments and comparison with previous literature, indicated that the crystallization behavior of the KFI-type zeolites did not follow typical seed-mediated growth. Instead, seed-dissolution–recrystallization behavior is thought to have occurred in the seeded-gel system.
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Acknowledgements
Part of this work was supported by a “Grant for Advanced Industrial Technology Development” in 2016–2017 from the New Energy and Industrial Technology Development Organization (NEDO), Japan. We gratefully thank Dr. Kunio Suzuki and Ms. Rie Sato (AIST) for their assistance with the FE-SEM and XRD measurements. We thank Sarah Dodds, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
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YK performed the main experiments; all authors discussed the results and wrote the manuscript.
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Kamimura, Y., Endo, A. Seed-assisted, organic structure-directing agent-free synthesis of KFI-type zeolite with enhanced micropore volume and CO2 adsorption capacity. Adsorption 25, 1099–1113 (2019). https://doi.org/10.1007/s10450-019-00113-6
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DOI: https://doi.org/10.1007/s10450-019-00113-6