期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 112, 期 1-3, 页码 357-367出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2007.10.010
关键词
microwave-hydrothermal synthesis; SSZ-51; DMAP; molecular sieve
The crystallization of microporous silico-aluminophosphate SSZ-51 has been investigated under microwave-hydrothermal (M-H) conditions. The crystallization was performed by employing fumed silica, pseudoboehmite, ortho-phosphoric acid as silica, alumina kind phosphate precursors, respectively, using 4-dimethyl aminopyridine (4-DMAP) as structure directing agent (Template) at 453 K. The effect of parameters such as template concentration, F- ion concentration and crystallization time on the crystallization of SSZ-51 phase was investigated. The crystallized samples were characterized by means of powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), nitrogen adsorption-desorption measurements at 77 K, Si-29 CP/MAS NMR and scanning electron microscopy (SEM). The obtained results clearly demonstrated the role of Template/F- ion concentration in the initial gel and crystallization time are critical to obtain pure silico-aluminophosphate SSZ-51 framework under M-H conditions. (C) 2007 Elsevier Inc. All rights reserved.
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