Supported superbase shaped solid sorbents for CO2 capture

The development of sorbents with high adsorption capacity and cyclic stability is crucial for cost-effective CO 2 capture solutions. The sorbents that have been developed at the lab scale are mostly analyzed in powder form, and industries must invest heavily if they need to be upscaled and analyzed again in shaped form. As a result, laboratory-scale innovations often remain confined to scientific curiosities. Four support materials such as mesoporous silica, porous activated carbon, graphene nanoplatelets, and aluminum oxide beads were developed, post-functionalized by superbase 1,5,7-triazabicyclo[4.3.0]non-6-ene (TBN), and investigated for their CO 2 adsorption capacities using 15 % CO 2 gas. The initial adsorption capacity of 2 and 1.1 mmol/g were obtained for silica-TBN, and carbon-TBN beads, respectively. The silica-TBN bead exhibited a 50 % reduction in CO 2 adsorption capacity in 210 cycles, with a reduction rate per cycle of 0.0095 mmol/g, while the carbon-TBN bead experienced the same reduction after 95 cycles, with a rate of 0.011 mmol/g. • Impact of support on CO 2 uptake and cyclic stability was carefully investigated. • TBN-beads explored for CO 2 capture from 15 %, 1000 ppm, and 500 ppm CO 2 . • Silica-TBN and carbon-TBN had 2 and 1.1 mmol/g CO2 uptake, with good cyclic stability. • Silica-TBN lost 50 % capacity in 210 cycles, with 0.0095 mmol/g per cycle rate. • Carbon-TBN lost 50 % capacity in 95 cycles, with 0.011 mmol/g per cycle rate.