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Title: Feedstock recycling of plastic waste by hydrocracking
Author: Hernandez-Martinez, Jesus
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2008
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Management of plastic wastes is a primary environmental concern and recycling has become unavoidable. A novel approach to plastics recycling is feedstock recycling with which the plastic waste is decomposed in a controlled manner to provide useful chemicals, with liquid fuels as the main target. Hydrocracking arises amongst feedstock recycling alternatives with some advantages such as being an exothermic reaction (energy being a useful by-product) and providing a high quality fuel. Hydrocracking of plastic wastes has focused some attention on researchers worldwide. Model compounds, virgin plastics and plastic wastes have been hydrocracked. Batch autoclave reactors were, virtually, the only system used for these tests. In the literature, a range of catalysts were essayed and typical conditions of reaction were: hydrogen pressures of 70 bar, temperatures of 400°C and reaction times of 60 minutes. Total conversions of polymers such as HDPE were obtained with oil yields reaching 70 %. However, reported researches present some important gaps such as: poor analysis of products of reaction, poor definition of targeted product, limited study of reaction parameters, very little catalyst development or study, no deactivation assessments and no heat balance or thermodynamic analysis. This research tries to address most of these understudied issues. A batch autoclave reactor with an in-house developed sampling system was used to perform hydrocacking tests. The main catalyst group targeted was platinum loaded zeolites which have been overlooked in the literature despite their potential as being highly active and selective. A series of USY and one MOR zeolites (in sodium form) were ion exchanged with Pt(NH3)4Clzsalt to obtain 1% and 0.5% Pt loadings. Then were dried, calcined and activated by slow heating under hydrogen atmosphere obtaining the H form of the zeolite with the metal in its 0 oxidation state.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available