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%0 Thesis %A Lehnertz, Marcus Stephan %T Chemisches Recycling von (Bio)Kunststoffen : Hydrolyse mit festen Katalysatoren %I RWTH Aachen University %V Dissertation %C Aachen %M RWTH-2025-07241 %P 1 Online-Ressource : Illustrationen %D 2025 %Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, RWTH Aachen University, 2025 %X The global production of polymers is a major story of success since the 1950s. The amount of polymers reaches new heights almost every year and will expand further in the course of this century, mainly driven by the excellent cost-use relation. However, since the plastic economy is predominantly a linear one, the drawbacks of this unparalleled story of success become more and more obvious. Environmental pollution, both, by the exploration of new raw materials for the linear plastic economy as well as the effects of mishandled waste streams, becomes increasingly apparent. Besides the reduction of plastic usage and the direct reuse of plastics, recycling stands out as promising option to deal with these emerging issues. Whereas mechanical recycling is the most efficient way in the case of pure waste streams, tertiary recycling, also known as chemical recycling, is the way to go for mixed or reinforced plastic waste. The options include thermal processes such as pyrolysis and gasification as well as solvolysis with a respective solvent at comparably lower temperatures. If water is the solvent of choice, the process is thereby called hydrolysis. The focus of this work will be the hydrolysis accelerated by solid catalysts. The investigated polymers will comprise of bioplastics such as Polylactic acid (PLA) and Polyhydroxybutyric acid (PHB) as well as conventional ones such as Poly(Bisphenol A) carbonate (PC) and Poly(ethylene terephthalate) (PET). The bioplastics are thereby used as model substrates due to their ability to be relatively easily hydrolysed. The gained insights will be applied to the named conventional plastics in order to establish a comparison between these different kinds of polymers. For this reason, the investigation and subsequent analysis of the applied catalysts is a key factor. Several catalysts systems consisting of a variety of carriers and active metals are investigated. Parameters such as the specific surface area, dispersion and the electronic structure are analysed with a broad range of analytical tools ranging from nitrogen physisorption to temperature programmed reduction (TPR) and desorption (TPD) as well as x-ray photoelectron spectroscopy (XPS). In a complementary step, the technical viability of the developed reaction and catalytic system will be assessed especially by means of catalyst stability and applicability to reinforced polymers and copolymers. The insights gained will contribute to the assessment of the potential of heterogeneous catalysis in the field of polymer hydrolysis. %F PUB:(DE-HGF)11 %9 Dissertation / PhD Thesis %R 10.18154/RWTH-2025-07241 %U https://publications.rwth-aachen.de/record/1017248