In the transition to a more sustainable world, refiners are challenged with a feedstock pool of ever increasing complexity. Pyrolysis oil derived from plastic waste or biomass is a typical example of such a new feedstock. This liquid is used to replace fossil-based feedstock in the production of  variety of chemicals. Before pyrolysis oil can be used, it needs upgrading to remove impurities like e.g. oxygen, sulfur and nitrogen. These pyrolysis oils are very diverse in properties, meaning extensive testing is needed.