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Coal is a fossil fuel widely employed to produce electric power, industrial and residential heating, among other activities. However, coal combustion produces pollutant emissions with negative impact on the environment. The main product of combustion is CO2, considered a greenhouse gas that can contribute to climate change. Different technologies have been proposed with the aim to diminishing CO2 emissions to the atmosphere. One of the alternatives consists in the use of a high O2 concentration, almost free of nitrogen, during combustion in order to obtain the exhaust gases with high CO2 content, which can facilitate its separation. The increasing in O2 partial pressures causes important changes in the chemical environment of the combustion which affects the oxidation reactions and the pollutants emissions, such as NOx and SOx. In this research it was found that under oxy-combustion conditions, high CO2 concentrations promote NO2 formation. Therefore, it is important to determine the effect of these modifications on the global process.
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