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Zeolite synthesis in the presence of flexible diquaternary alkylammonium ions (C2H5)3N(CH2)nN(C2H5)3 with n=3–10 as structure-directing agents |
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| Authors: | Song-Ho Lee Chae-Ho Shin Guang Jin Choi Tae-Jin Park In-Sik Nam Bada Han Suk Bong Hong |
| Affiliation: | a Department of Chemical Engineering, Chungbuk National University, Chungbuk 361-763, South Korea b School of Advanced Materials Engineering, Inje University, Kyungnam 621-749, South Korea c Clean Technology Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea d Department of Chemical Engineering, School of Environmental Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea e Division of Chemical Engineering, Hanbat National University, Taejon 305-719, South Korea |
| Abstract: | The use of flexible diquaternary alkylammonium ions (C2H5)3N+(CH2)nN+(C2H5)3 (Et6-diquat-n with n=3–10) as structure-directing agents for zeolite synthesis in the presence of alkali metal cation is described. Among the organic structure-directing agents studied here, a considerable diversity in the phase selectivity was observed only for the Et6-diquat-5 ion: this cation can produce five different zeolite structures (i.e., P1, SSZ-16, SUZ-4, ZSM-57, and mordenite), depending on the oxide composition of synthesis mixtures. Analysis of the variable-temperature 1H CRAMPS NMR spectra obtained from the Et6-diquat-5 molecules in these five zeolites reveals that the host–guest interactions occurring within the respective materials maintain in a manner different from one another even at 160 °C at which the zeolite hosts crystallize. |
| Keywords: | Zeolite syntheses Diquaternary ammonium ions Alkali metal cations Phase selectivity Variable-temperature 1H CRAMPS NMR |
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