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Preparation and Characterization Open Framework Zeotype Germanates

Author: XiaoPengYan
Tutor: RenTieZhen
School: Hebei University of Technology
Course: Chemical processes
Keywords: Molecular sieves Tellurite Silicon germanium salt Hydrothermal Synthesis Crystal structure
CLC: TQ424.25
Type: Master's thesis
Year: 2010
Downloads: 26
Quote: 0
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Abstract


In recent years, the study of open-framework structure of germanium salts molecular sieve has been a cause for concern , the tellurite skeleton structure in the secondary structural elements in the role of organic amine template , you can build a variety of structural skeleton , and therefore exhibit the special pore characteristics ( e.g. , macroporous Oversized holes , low skeletal density , having a chiral , etc.) , a large number of molecular sieve having a the new topology germanium salts been reported . However, the application of the open framework tellurite by poor its skeleton thermal stability factors constraining . Researchers have been looking for ways and means to get tellurite materials are thermally stable structure . Therefore, the silicon - modified tellurite materials is particularly important. In this thesis, hydrothermal , solvothermal system , germanium dioxide as a substrate , using several different organic amines as templating agent synthetic germanate and GE9 , GE10 cluster structures silicon germanium salts zeolite and were characterized by means of X-ray diffraction , infrared spectroscopy , scanning electron microscopy characterization of the resulting molecular sieves structure, morphology . In this thesis, 2 - methyl - pentanediamine as a template agent synthesized molecular sieve three-dimensional structure the Ge - pharmacosiderite pure germanium salts , this structure constituted by GE10 aggregates eight ring channels ; using ethylenediamine as a template , orthosilicate ethyl silicon source to the synthesis of a series of different silicon content of silicon germanium salts molecular sieve , its structure is by such as Ge7, Ge9 aggregates membered ring pore structure , improved thermal stability ; 2 - methyl glutaryl an amine as the templating agent and sodium silicate as the silicon source , synthesized in the same series of silicon content type silicon germanium salts zeolite , the pore structure of its structure consists of the GE10 aggregates constituting the type of the ring , so that the existence of these channels in the catalytic gas absorption and separation and ion exchange have potential application value . The paper also attempts tested on GE7 , the cluster structures GE9 the germanium salts hydrogen storage properties of molecular sieve sample after ion exchange in the conditions of low pressure ( 0.2bar ) hydrogen storage capacity of up to 4 wt % . This work has a the macroporous large holes and low skeletal density of germanium salts molecular sieve application is of great significance .

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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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