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Title: Preparation, characterisation and application of ordered mesoporous materials
Author: Sakina, Farzeen
ISNI:       0000 0004 8502 5214
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2019
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The history of ordered mesoporous materials starts with the discovery of MCM-41(Mobil Composition of Matter-41) in 1992 using an organic template as structure directing agent. Mesoporous materials have not only proved to be ideal candidates in various fields like, for example, catalysis but could also be potentially used as a hard template for synthesising other useful mesoporous materials. The aim of this research was to develop industrially feasible and environmentally friendly methods for the preparation of ordered mesoporous materials, to characterise these and to study their applications. The main techniques used for the characterisation of these mesoporous materials were N₂ physisorption, XRD and TEM. In the first part of the study, metal- and halogen-free ordered mesoporous polymer and carbon materials having 2D hexagonal (P6mm) and body centered cubic (Im3̅m) mesostructures were made using a modified two phase method employing alternative polymerisation and condensation catalysts. These materials had high surface area and pore volume and had narrow pore size distributions. Their physical evolution with increasing calcination temperature was examined as were the effects of varying synthesis parameters on the nature of the final mesostructure. The second part of the study was focused on the synthesis of ordered mesoporous ceria using metal- and halogen-free ordered mesoporous carbon materials - made in the first part of the study - as the hard template. The mesoporous ceria having 2D hexagonal arrangement of pores were successfully synthesised using a solid-liquid method which is a solvent free, easy to use and environmentally friendly method. The carbon template calcined at 400 °C was found to be the best template in terms of giving high loading of precursor and giving high quality product. The synthesis of body centered cubic ceria was less successful than hoped due to the small pore openings in this template material. The third part of study involved the preparation of mesoporous carbon supported Pd catalysts and their use in the hydrodechlorination of trichloromethane (TCM). The results were very promising, and 100 % conversions were obtained at 175 °C with high selectivity to alkanes and low selectivity to intermediate chlorinated products.
Supervisor: Baker, Richard Sponsor: University of St Andrews
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: TA418.9P6S2 ; Mesoporous materials ; Mesoporous materials--Synthesis