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Fishing net is considered as one of the biggest problem in the world owing to the release of micro-plastics from abandoned fishing nets, which contributes to marine pollution. Although disposal and recycling strategies are considered as effective methods for overcoming these problems, the pyrolysis of abandoned waste has emerged as a strategy to recover massive quantities of waste materials. In this study, to develop an effective method to valorize abandoned fishing net, the effect of the use of a CaCO3 catalyst after the loading method (i.e., in-situ and ex-situ) on pyrolytic products of abandoned fishing net was investigated using micro-gas chromatography and gas chromatography/mass spectrometry. Compared to non-catalytic pyrolysis, catalytic pyrolysis increased the yield of non-condensable and condensable gas. Particularly, the ex-situ method significantly increased the yield of non-condensable gas to up to 37.2 wt.% at 900. Compared to the ex-situ method, in-situ loading method increased the yield of condensable products to up to 82 wt.%. The understanding of the difference between different catalyst loading configurations will provide useful insight on thermocatalytic waste conversion processes.

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Municipal solid waste (MSW) management is an essential municipal service. Proper waste treatment is an important part of the waste management. Thermocatalytic waste upcycling has recently gained great interest and attention as a method to extract value from waste, which potentially substitutes traditional waste treatment methods. This study aims at demonstrating the potential for thermocatalytic waste upcycling using spent disposable wipes as an MSW surrogate. Two different Ni/Al 2 O 3 catalysts were prepared, treated under two different atmospheres (N 2 and CO 2 ). The catalyst treated in N 2 (Ni/Al 2 O 3 -N 2 ) exhibited a higher surface metallic Ni site than the catalyst treated in CO 2 (Ni/Al 2 O 3 -CO 2 ). The use of the Ni/Al 2 O 3 -N 2 increased the yield of gas pyrolysate and decreased the yield of byproduct (e.g., wax), compared with no catalyst and the Ni/Al 2 O 3 -CO 2 . In particular, the Ni/Al 2 O 3 -N 2 catalyst affected the generation of gaseous hydrogen (H 2 ) by increasing the H 2 yield by up to 102% in comparison with the other thermocatalytic systems. The highest H 2 yield obtained with the Ni/Al 2 O 3 -N 2 was attributed to the most surface metallic Ni sites. However, the Ni/Al 2 O 3 -N 2 catalyst led to char having a lower higher heating value than the other catalysts due to its lowest carbon content. The results indicated that the reduction treatment environment for Ni/Al 2 O 3 catalyst influences thermocatalytic conversion product yields of spent disposable wipes, including enhanced H 2 production. Electronic Supplementary Material Supplementary material is available in the online version of this article at 10.1007/s11814-023-1461-8.