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- 저자 : Juan I. del Río (검색결과 1 건)
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Juan I. del Río,Eduardo Pérez,David León,Ángel Martín,María D. Bermejo 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
The catalytic conversion of CO2 captured in aqueous media into formate was studied using aluminum-sourced hydrogenin a batch reaction system. To do so, themain ammonia-basedCO2absorption derivatives:ammoniumcarbamate,carbonate and bicarbonateandsodiumbicarbonatewere selectedasCO2source.Theperformance 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 orderammonium bicarbonate < sodium bicarbonate < ammonium carbonate < ammonium carbamate. Ammo-nium bicarbonate and sodium bicarbonate reagents needed higher temperature (250 C) for an increasedyield. Results with ammonium carbamate as starting material indicate a significant effect of time andcatalyst content on formate yield, which ranged between 4 and 38%. Experiments with gaseous H2 showedthat a comparable yield with Al can be obtained at a similar level of pressure. The reutilization andcharacterization of the reaction solid, comprising exhausted aluminum and Pd/C catalyst, showed that thealuminum was not completely oxidized up to the 5th re-use, and Pd can play a reducing role through theformation of palladium hydride species. The process can be improved by operating at higher pressure andlower temperature, to avoid loss of yield by dehydration of formate.
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