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Title: Platinum group metal modifications of TiO₂ for environmental remediation
Author: Johnson, T.
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2017
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This thesis will present the work conduced in the field of heterogeneous catalysis. This will mostly pertain to the TiO₂ system and the modification of such systems by the addition of platinum group metals (PGM). A fundamental study of the P25 TiO₂ system was undertaken and results showing the effect of multiple variable on catalytic activity are presented along with thorough characterisation of the anatase-rutile TiO₂ P25 system. Work on various synthetic methods is also presented. This consists of samples impregnated with PGM salts, prefabricated nanoparticles dispersed onto TiO₂ and flame spray pyrolysis synthesis of TiO₂ doped with both rhodium and erbium. These systems were explored by means of X-ray analysis and optical measurements before catalytic testing was conducted. In this section a method for rapid screening of doped TiO₂ by flame spray pyrolysis is discussed and the merits of such a system demonstrated. Extensive work has been conducted on the rhodium TiO₂ system. Pertaining to the solid state and the sol-gel synthetic routes of RhₓTi₁₋ₓO₂. The solid state system was studied and optimised before X-ray and optical experimentation was conducted to prove doping had occurred. From this the reduction and oxidation of the samples was studied. Using this as a model system evidence of Rh migration out of the TiO₂ lattice during reduction and oxidation was explored. A study of the sol-gel synthesis of RhₓTi₁₋ₓO₂ was also conducted. In this study optimisation of the synthetic system was undertake looking specifically at the pH of the sol and the subsequent calcination of the material. The triphasic nature of samples fired between 500-600 °C was studied and a series of doped RhₓTi₁₋ₓO₂ were produced and the phases produced during such calcination monitored as a function of temperature.
Supervisor: Rosseinsky, M. J. ; Claridge, J. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral