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Syntheses and Structures of Novel Microporous Gemanate-based Molecular Sieve Materials

Author: LiuZhiCheng
Tutor: ZhaoDongYuan
School: Fudan University
Course: Physical and chemical
Keywords: Microporous materials Zeolite Tellurite Metal tellurite Hydrothermal Synthesis Solvothermal Synthesis Crystal structure MCM-22 Static hydrothermal crystallization
CLC: TQ424.25
Type: PhD thesis
Year: 2003
Downloads: 427
Quote: 1
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Abstract


Microporous molecular sieve material is an important one in the family of inorganic porous material, because they have a regular pore structure and unique properties is widely used in ion exchange, catalysis, adsorption, separation and chemical micro-reactor field of host-guest chemistry. The design, synthesis and properties of the new topology and chemical composition of microporous compounds has been the subject of attention. In recent years, the study of the germanate zeolite gradually cause for concern, to become one of the frontier molecular sieve synthesis. A variety of germanium coordination ASU-14, containing three-membered ring UCSB-9, the spiral channels UCSB-7 and a 24-ring big hole FDU-4 tellurite molecular sieve, suggesting that tellurite system can synthesis the traditional silicate zeolite molecular sieve structure, molecular sieve, a cause of great interest. The major part of this paper it is carried out for this research focus, to explore the synthesis of a new topology and new tellurite and metal organic amine or alkali metal as structure directing agents in hydrothermal and solvothermal system tellurite molecular sieve, and a summary of their structural characteristics and synthetic law. 4 - amine-ethyl pyridine, 1,4 - butanediamine, and potassium ions as the structure-directing agent successfully synthesized in the the tellurite synthesis system showing four novel structure tellurite Zeolite: GE 5 of 5 O 5 (OH) 10 · 5H 2 O, (H 3 O) < / sup> K 3 Ge 7 O 16 · 3H 2 O (FDG-1), K 4 Ge 9 O 20 (FDG-2), and (of C 3 H 11 N 2 ) (OH) [Ge 10 O 20 ]. Which Ge 5 O 5 (OH) 10 · 5H 2 O ring by the three-membered ring, and nine a layered structure composed with similar UCSB-9 structure; FDG-2 and poison pyrite structure FDG-1 having the two structural units of the same \28 , but connected in different ways; (of C 3 H 11 N 2 ) (OH) [the Ge 10 < / sub> O 20 ] AST zeolite topology. Tellurite synthesis system of the synthesis conditions and rule summary, the types of organic amine and a solvent to affect the shape of the larger, the organic amine of the structure and its hole has a certain relationship; structure-directing effect of alkali metal ions in general stronger than the organic amines, but piperazine and 1,3 - propanediamine exception; if trivalent aluminum or gallium ions are added to the synthetic system, then they will enter the zeolite framework involved in the structure is formed; the purposes of comparison with the pure silicate system, pure tellurite structure more easily with a diamine and organic amines such template matching. Zirconium germanate synthesis system, ZrO (NO 3 ) 2 · 2H 2 O as zirconium source for the first time, with pyridine (or ethylene glycol) and water solvent, fluorine ions do mineralizing agent, respectively, with piperazine, 1,4 - butanediamine and triethylene tetramine a structure directing agent successfully synthesized three novel zirconium germanate zeolite (C 4 N 2 H 12 ) [ZrGe 4 O 10 F < sub> 2 ] (FDZG-1), (NH 4 ) 2 ZrGe 3 O 9 2 H 10 N 2 ) H 2 O [ZrGe 3 O 9 ] (FDZG-3). Its structure by the zirconium oxide (fluorine) hexahedral connected germanium maleate basic unit to form a three-dimensional structure, wherein the basic unit of the tellurite were layered, triangular, chain. Their structure contains a large number of three-membered ring. In the titanium-tellurite synthesis system, respectively using the piperazine and triamine ethyl amine as a structure-directing agent successfully together Fudan Bo l: abstract into two new Khin germanate zeolite the material (C4H. Yin 2) 6 [Ti .2 Ge2208. ] (FDTG l) and (C6H22N4) 2 [Ti3oe: 4035] (FoTo 2), invasive door structure by Chin germanium clusters connected. FTG 1 grounds Chin germanium clusters [Ti.ZGe20O Secretary and Geo; the tetrahedra connected two-dimensional layered structure, inter-layer contains molecules gung winded; FTG 2 Chin germanium clusters [Ge, ZTi3O Secretary together into a three-dimensional structure , triamine the ethylamine molecule in its eight-membered ring channels have a stabilizing effect. Study the synthesis of a salt of a metal such as aluminum, boron, zinc, germanium, and the alkali metal ions as a structure-directing agent successfully synthesized aluminum the germanium molecular sieve KAIGe3OS and boron germanium zeolite libgeo;, its topology and feldspar Paracelsian and cristobalite The structure is similar. These two types of zeolite is easy to form a connecting zeolite-like topology. Also synthesized some zinc germanium salt flake microcrystalline, the structure needs to be parsed. Another small part of the paper is also an industrial application of the value of new zeolite molecular sieve MCM-22 static synthesis study summarizes the appropriate synthesis conditions, and expand the scope of the synthesis of silica-alumina ratio.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Adsorbent > Inorganic adsorbent > Used as artificial silicate adsorbent
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