• The presented results confirmed the feasibility of hydrogen-rich gas production in the process of steam gasification of coal combined with CO2 capture.
• Fe2O3 added enhanced the conversion rate of CO to CO2, whereas CaO effectively absorbed the produced CO2 (particularly when mixed with a coal sample).
• The total contents of 83% and 90% of hydrogen in the gaseous products mixture were achieved in the process of steam gasification of coal at the temperature of 923 K with addition of Fe2O3 and CaO in layers and mixed, respectively.
• The total yields of hydrogen produced in 1 h gasification tests increased with the temperature of the process and the highest ones were observed at the temperature of 1173 K (5295 ml and 5901 ml in case of additives of Fe2O3 and CaO layered and mixed, respectively).
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.