Coal is a widely available energy source, but it comes with transportation costs and emissions. To tackle the emission issue, researchers studied the combustion reactivity of three Malaysian coals under mild gasification conditions. They used a thermogravimetric analyzer to test different combustion parameters like temperature, oxygen levels, and particle sizes. The Silantek coal had the highest fix carbon and calorific value, while the Mukah-Balingian coal had the lowest fix carbon. The study found that higher combustion heating rates increase the likelihood of ignition.