Methanation of CO2 from flue gas: experimental study on the impact of pollutants

• Published in: Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2021-12, Vol.134 (2), p.743-757
• Main Authors: de Araujo, Gabriel E., de Castro, Jéssica H., Monteiro, Wesley F., de Lima, Jeane, Ligabue, Rosane A., Lourega, Rogerio V.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Physical Chemistry
• ISSN: 1878-5190; 1878-5204
• DOI: 10.1007/s11144-021-02092-8

The current work determines the maximum concentrations of pollutants that interfere significantly in the process, mainly in the catalyst. With this, the study tested the impact of oxygen, sulfur dioxide and nitrogen monoxide on NiO/SiO 2 commercial catalyst more used in this process. Besides this, from reactions with and without contaminants, the catalyst was characterized through TGA, FESEM and TEM in order to evaluate the impact of each element on its morphology. Experiments with the presence of the oxygen showed that the O 2 consumes the hydrogen and produces more water, reducing the CO 2 conversion and CH 4 formation. Sulfur showed a significant impact at the reducing of its activity catalyst in concentrations above 5 ppm. Nitrogen monoxide, which is a major component of NOx showed to be little harmful to the catalyst, changing the reaction stability at the CO 2 conversion. Both NO and SO 2 changed the catalyst morphology and ripped apart the nickel particles from the support, decreasing the catalyst activity over time.