Mechanisms of Quick Zeolite Beta Crystallization

被引：38
作者：
Hould, Nathan [1 ]
Haouas, Mohamed [2 ]
Nikolakis, Vladimiros [3 ]
Taulelle, Francis [2 ]
Lobo, Raul [1 ,3 ]
机构：
[1] Univ Delaware, Ctr Catalyt Sci & Technol, Dept Chem & Biomol Engn, Newark, DE 19716 USA
[2] Univ Versailles St Quentin Yvelines, Inst Lavoisier Versailles, Versailles, France
[3] Univ Delaware, Catalysis Ctr Energy Innovat, Dept Chem & Biomol Engn, Newark, DE 19716 USA
来源：
CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 18期
关键词：
zeolite beta; small angle x-ray scattering; small angle neutron scattering; nucleation; nuclear magnetic resonance; colloid; AQUEOUS SILICATE SOLUTIONS; ANGLE NEUTRON-SCATTERING; SI-29; NMR-SPECTROSCOPY; BASIC SOLUTIONS; STRUCTURE-DIRECTION; CLEAR SOLUTIONS; SILICALITE-1; CRYSTALLIZATION; NATIONAL-INSTITUTE; MONOVALENT CATIONS; MOLECULAR-SIEVES;
D O I：
10.1021/cm3020995
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Silicate self-assembly and zeolite beta crystallization in the presence of 4,4'-trimethylenebis(N-methyl, N-benzyl piperidinium) (TMP2+) structure directing agent were studied using a combination of Si-29 and Al-27 nuclear magnetic resonance (NMR), small angle scattering (SAS), and attenuated total reflectance Fourier transform infrared (ATR/FTIR) spectroscopy. Crystallization of nanosized siliceous TMP2+ zeolite beta proceeds along three populations of particles (i.e., primary, secondary, and tertiary), differing in size and internal structure similar to crystallization of aluminum containing zeolite beta with tetraethylammonium (TEA(+)) as structure directing agent. Aluminosilicate TMP2+ zeolite beta, however, crystallizes along a very unique pathway, wherein secondary particles are final partially crystalline colloidally stable zeolite beta. TMP2+ zeolite beta crystallizes quickly when compared to TEA(+) zeolite beta, which takes nearly a hundred hours to crystallize under similar synthesis conditions.
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收藏
页码：3621 / 3632
页数：12
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