Fig. 5: DACCU to produce solar syngas.
From: Direct air capture of CO2 for solar fuel production in flow
a, The designed reactor for in-flow DAC and CO2U. b, CO2 levels and photocatalytic CO and H2 formation rates in the outflow during DACCU. The CO2 values during capture (0–12 h) are multiplied by a factor of 200 for ease of visualization. DAC was performed during light-off operation at room temperature under airflow (90 ml min−1) and the CO2U is carried out during light-on operation under 3-sun illumination at 25 oC under N2 flow (1 ml min−1). c, Cumulative H2 and CO yield over time during DACCU. d, Recapture and rerouting of unreacted CO2 for increased conversion and low carbon emission. The additional downstream unit was loaded with fresh adsorbents for unreacted CO2 capture and rerouting during conversion. e, Cumulative H2 and CO formation over time during first- and second-pass conversion during operation under simulated solar irradiation. Data are presented as the average of two independent runs, and the individual data points are shown in hollow circles.
