RT info:eu-repo/semantics/article
T1 Catalytic hydrothermal conversion of CO2 captured by ammonia into formate using aluminum-sourced hydrogen at mild reaction conditions
A1 Río Bladón, Juan Ignacio del
A1 Pérez, Eduardo
A1 León Mediavilla, David
A1 Martín Martínez, Ángel
A1 Bermejo Roda, Maria Dolores
K1 Hydrothermal reduction
K1 Reducción hidrotermal
K1 Formic Acid
K1 Ácido fórmico
K1 Ammonium carbamate
K1 Carbamato de amonio
K1 3308 Ingeniería y Tecnología del Medio Ambiente
K1 3303 Ingeniería y Tecnología Químicas
AB 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.
PB Elsevier
SN 1226-086X
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/46919
UL https://uvadoc.uva.es/handle/10324/46919
LA eng
NO Journal of Industrial and Engineering Chemistry, 2021, vol. 97. p. 539-548
NO Producción Científica
DS UVaDOC
RD 23-nov-2024