Increasing power demand concurrently with a desire to reduce greenhouse gas emissions have generated a growing interest in technologies based on sustainable fuels or optimized industrial processes. Unfortunately, impurities in these fuels have hampered a wider deployment of power and heat production via thermal processes mostly due to high-temperature corrosion. To change the status quo, more information addressing high-temperature corrosion reactions is required. Therefore, the objective of this project is to particularize the different reactions to coherently describe the whole corrosion process by making use of new innovative experimental techniques that have not previously been applied to such studies. New insight on the reaction mechanisms would broaden the view on corrosion research, paving the road for new design and material solutions to increase the efficiency and availability of power plants utilizing renewable fuels. This would tremendously benefit communities globally.