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Title: Development of oxygen transfer materials for chemical looping reforming processes
Author: Giannakeas, Nikolaos
ISNI:       0000 0004 2745 693X
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2012
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Current production methods of H2 and the rationale for H2 production through the use of sustainable resources using alternative feedstock are covered in Chapter 1. A literature review of the two processes investigated (steam reforming 'SR' and chemical looping reforming 'CLR'), of the catalysts used in steam reforming applications with focus on Ni-based catalysts, and of two alternative types of hydrogen feedstock from the transport sector (waste automotive lubricating oil 'WALO' and scrap tyres pyrolysis oil 'STPO') is conducted in Chapter 2. The materials and methods are described in Chapter 3, including the methodology of manufacturing the catalysts made in house (Ni, Co, and Ce-based), materials characterisation, the process procedures, and analyses techniques. Chapter 4 first presents the results and discusses the outputs of the SR and CLR experiments of the W ALO and STPO. Both oils were shown as potentially good feedstock for SR and CLR, but removal of catalyst poisons would be necessary to prevent the gradual ~\ deactivation of the catalyst with increasing number of cycles of CLR. Especially for the STPO almost 12 wt% of the original tyre was converted to H2. Thermodynamic equilibrium of SR of CH4 with different steam to carbon ratios (SIC) and temperatures showed the CLR of methane would be best conducted at around 700 "C with SIC of 3. SR and CLR of Cllafor 10 cycles indicated the trimetallic catalyst made in house (Ni-Co-Ce/y-Al203) had very good potential for CLR, with outputs equal and maintained to equilibrium values, and evidence of significantly higher oxygen transfer than a 25 wt% NiO/y-Al203 commercial catalyst.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available