Lee, SH Shin, CH Choi, GJ Park, TJ Nam, IS Han, B Hong, SB 2024-01-21T08:38:39Z 2024-01-21T08:38:39Z 2021-09-03 2003-06-19 1387-1811 https://pubs.kist.re.kr/handle/201004/138458 The use of flexible diquaternary alkylammonium ions (C(2)H(5))(3)N(+)(CH(2))(n)N(+)(C(2)H(5))(3) (Et(6)-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 Et(6)-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 (1)H CRAMPS NMR spectra obtained from the Et(6)-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 degreesC at which the zeolite hosts crystallize. (C) 2003 Elsevier Science Inc. All rights reserved. English ELSEVIER SCIENCE BV SKELETAL ISOMERIZATION CATALYTIC EVALUATION FRAMEWORK TOPOLOGY PROTON NMR SUZ-4 ZSM-57 N,N,N,N&apos ,N&apos ,N&apos -HEXAETHYLPENTANEDIAMMONIUM DEHYDRATION REFINEMENT CATIONS Zeolite synthesis in the presence of flexible diquaternary alkylammonium ions (C(2)H(5))(3)N(+)(CH(2))(n)N(+)(C(2)H(5))(3) with n=3-10 as structure-directing agents Article 10.1016/S1387-1811(03)00381-0 1 MICROPOROUS AND MESOPOROUS MATERIALS, v.60, no.1-3, pp.237 - 249 MICROPOROUS AND MESOPOROUS MATERIALS 60 1-3 237 249 scie scopus 000183748700022 2-s2.0-0038479934 Chemistry, Applied Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article SKELETAL ISOMERIZATION CATALYTIC EVALUATION FRAMEWORK TOPOLOGY PROTON NMR SUZ-4 ZSM-57 N,N,N,N&apos ,N&apos ,N&apos -HEXAETHYLPENTANEDIAMMONIUM DEHYDRATION REFINEMENT CATIONS zeolite syntheses diquaternary ammonium ions alkali metal cations phase selectivity variable-temperature (1)H CRAMPS NMR