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 Characterization of Li+ Sites of (Al)IPC-2 Zeolite
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Tác giả hoặc Nhóm tác giả: R. Bulanek, M. Kolárová, H. Viet Thang, P. Nachtigall, P. Chlubná
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Nơi đăng: 6th International FEZA Conference 2014, Leipzig University, Germany
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; Số: 2014;Từ->đến trang: 60;Năm: 2014
Lĩnh vực: Tự nhiên; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
Recently, new zeolite structures were prepared by top-down chemically selective disassembly of a parent zeolite UTL, into its constituent layers and then reassembly by intercalating diethoxydimethylsilane between the layers or connecting directly these layers. As the result, new zeolites, labeled IPC-2 zeolite and IPC-4, respectively, exhibit orthogonal twelve-ring (6.6 x 6.2 Ǻ) and ten-ring (5.3 x 5.5 Ǻ) channels for IPC-2; ten-ring (5.8 x 3.8 Ǻ) and eight-ring (4.5 x 3.6 Ǻ) for IPC-4 with relatively spherical windows.1 Therefore, IPC-2 and IPC-4 zeolite comprises exactly the same layer topology as the parent UTL zeolite, but they present significantly smaller channel diameters. The question arises, how change in channel size influence localizations and coordination of extra-framework cations in IPC-2 and IPC-4 zeolite. Therefore UTL, IPC-2 and IPC-4 zeolites were converted into Li+ form in order to have an insight on coordination of cations in extra-framework sites. Li+ interacts with CO by electrostatic interaction and polarization strength of Li+ cation strongly depends on coordination of the Li+ cation to the zeolite framework and local environment of adsorption complex. Therefore, stretching frequency shift of CO in Li+/CO complexes and adsorption enthalpy of CO on Li+ cations bring site specific information on location of cationic sites in zeolites. FTIR spectra of CO adsorbed were measured different temperatures range from liquid nitrogen to room temperature. The stability of individual complexes was evaluated by recording of rate of CO desorption from the zeolites under dynamic vacuum at different temperatures. Adsorption enthalpy was determined by microcalorimetry measurement. Combining with experiment data, theoretical calculation also applied on these zeolites. These results will be compared and discussed. The further discussion and comparison of the results with other zeolitic structures will be provided in details in the following contribution
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ABSTRACT
Recently, new zeolite structures were prepared by top-down chemically selective disassembly of a parent zeolite UTL, into its constituent layers and then reassembly by intercalating diethoxydimethylsilane between the layers or connecting directly these layers. As the result, new zeolites, labeled IPC-2 zeolite and IPC-4, respectively, exhibit orthogonal twelve-ring (6.6 x 6.2 Ǻ) and ten-ring (5.3 x 5.5 Ǻ) channels for IPC-2; ten-ring (5.8 x 3.8 Ǻ) and eight-ring (4.5 x 3.6 Ǻ) for IPC-4 with relatively spherical windows.1 Therefore, IPC-2 and IPC-4 zeolite comprises exactly the same layer topology as the parent UTL zeolite, but they present significantly smaller channel diameters. The question arises, how change in channel size influence localizations and coordination of extra-framework cations in IPC-2 and IPC-4 zeolite. Therefore UTL, IPC-2 and IPC-4 zeolites were converted into Li+ form in order to have an insight on coordination of cations in extra-framework sites. Li+ interacts with CO by electrostatic interaction and polarization strength of Li+ cation strongly depends on coordination of the Li+ cation to the zeolite framework and local environment of adsorption complex. Therefore, stretching frequency shift of CO in Li+/CO complexes and adsorption enthalpy of CO on Li+ cations bring site specific information on location of cationic sites in zeolites. FTIR spectra of CO adsorbed were measured different temperatures range from liquid nitrogen to room temperature. The stability of individual complexes was evaluated by recording of rate of CO desorption from the zeolites under dynamic vacuum at different temperatures. Adsorption enthalpy was determined by microcalorimetry measurement. Combining with experiment data, theoretical calculation also applied on these zeolites. These results will be compared and discussed. The further discussion and comparison of the results with other zeolitic structures will be provided in details in the following contribution
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