The study looked at how to efficiently burn coal using a special method called CLOU. They tested a copper-based material in a small reactor with coal or coal char. They found that higher temperatures and smaller coal particles were better at burning with the CLOU material, leaving less unburned coal. Smaller coal particles produced more unburned gases, while larger particles relied more on a different burning process. The results show that different conditions and types of coal can affect how well CLOU works to burn coal.