Single coal char particle combustion in the carbon dioxide atmosphere

The combustion of single coal char particle in carbon dioxide atmosphere wa s studied. In experiments, brown coal from coal mine Cigel (Slovakia) has b een used. The combustion was monitored using the TGA method. The experiment al equipment allowed to study the mass of the particle and temperatures ins ide of the particle and on its geometrical surface. Time dependences of the se parameters were measured during combustion in different gas mixtures of carbon dioxide and argon (5-100 vol. % of CO2) and in the temperature range 800-1300 degreesC. For some samples, the properties such as pore size dist ribution, specific surface area, and porosity were determined by the mercur y porosimetry and the nitrogen sorption method. The results showed that coa l char particle combustion proceeded via a homogeneous mechanism. The micro structure properties of a partially combusted particle showed an important increase in the specific surface area compared to the original coal char pa rticle, which was mainly formed by micropores. Such partially combusted par ticle can be used as a cheep adsorbent.