Electronic Thesis and Dissertation Repository

Degree

Master of Science

Program

Chemistry

Supervisor(s)

Dr. Yining Huang

Abstract

Microporous solids are a widely used material in adsorption, storage and catalysis. In this thesis, the crystallization of the silcoaluminaphosphate DNL-6 was characterized using powder X-ray diffraction and solid state nuclear magnetic resonance. Two crystallization routes of the SAPO DNL-6 were studied, which are the hydrothermal method and the dry-gel conversion method. Both methods followed the same crystallization pathway and showed a layered intermediate that is then transformed into DNL-6. The reaction requires two templating agents to create the RHO topology and silicon substitutes into the framework by replacing single phosphorous atoms.

This thesis contains the conformational analysis of halocarbons adsorbed into different metal-organic frameworks has also been studied using FT-Raman spectroscopy. 1,2-dichloroethane and 1-bromo-2-chloroethane were adsorbed into MIL-53, MIL-68, MIL-53NH2, while chlorocyclohexane was adsorbed in MIL-53. For non-polar frameworks the main guest-host interactions are van der Waal interactions. The polar framework of MIL-53NH2 is able to stabilize the gauche conformation of DCE and BCE at room temperature. The enthalpy of each system was determined through variable temperature FT-Raman spectroscopy and the width of the Raman bands was able to give information regarding the molecular motion of the halocarbons.


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