2024-03-29T12:27:21Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/469192022-05-01T21:16:19Zcom_10324_31661com_10324_952com_10324_894col_10324_31662
UVaDOC
author
Río Bladón, Juan Ignacio del
author
Pérez, Eduardo
author
León Mediavilla, David
author
Martín Martínez, Ángel
author
Bermejo Roda, Maria Dolores
2021-06-17T11:49:14Z
2021-06-17T11:49:14Z
2021
Journal of Industrial and Engineering Chemistry, 2021, vol. 97. p. 539-548
1226-086X
https://uvadoc.uva.es/handle/10324/46919
10.1016/j.jiec.2021.03.015
The catalytic conversion of CO2 captured in aqueous media into formate was studied using aluminum-sourced hydrogen in a batch reaction system. To do so, the main ammonia-based CO2 absorption derivatives: ammonium carbamate, carbonate and bicarbonate and sodium bicarbonate were selected as CO2 source. The performance of the different species was determined under mild hydrothermal reaction conditions (120 °C), using Pd/C 5 wt% catalyst. In these conditions, the formate yield and selectivity increase in the order ammonium bicarbonate < sodium bicarbonate < ammonium carbonate < ammonium carbamate. Ammonium bicarbonate and sodium bicarbonate reagents needed higher temperature (250 °C) for an increased yield. Results with ammonium carbamate as starting material indicate a significant effect of time and catalyst content on formate yield, which ranged between 4 and 38%. Experiments with gaseous H2 showed that a comparable yield with Al can be obtained at a similar level of pressure. The reutilization and characterization of the reaction solid, comprising exhausted aluminum and Pd/C catalyst, showed that the aluminum was not completely oxidized up to the 5th re-use, and Pd can play a reducing role through the formation of palladium hydride species. The process can be improved by operating at higher pressure and lower temperature, to avoid loss of yield by dehydration of formate.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Catalytic hydrothermal conversion of CO2 captured by ammonia into formate using aluminum-sourced hydrogen at mild reaction conditions
info:eu-repo/semantics/article
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URL
https://uvadoc.uva.es/bitstream/10324/46919/1/Catalytic-hydrothermal-conversion-CO2.pdf
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1044728
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Catalytic-hydrothermal-conversion-CO2.pdf