Porous material for CO2 capture: preparation, performance evaluation, and analysis of adsorption isotherms

Investigation on Integrated CO2 Capture and Conversion Performance of Ni-CaO Dual-Function Materials Pellets: Effect of Ni Loading and Optimization of Operating Parameters

“…For the adsorption of CO 2 over solid adsorbents, the influence of WHSV on the uptake of CO 2 could be complicated. On the condition that intraparticle diffusional resistance is independent of particle size exceeding 600 μm, CO 2 adsorption depends mainly on mass transfer through the outside part of the particle . The increasing gas velocity facilitates the transfer of more CO 2 molecules from the bulk gas phase to the gas–solid boundary layer, allowing the bulk and film diffusion resistance to be overcome .…”

“…Extrusion–spheronization has been identified as a promising technique for fabricating pellets with particle sizes ranging from 0.5 to 1.5 mm . It has been reported that particle size variations in this range have no significant effect on CO 2 adsorption performance of adsorbent pellets. − For instance, Dinda et al confirmed that the CO 2 adsorption capacity of the Zeolite-13X adsorbent showed no significant variation when the particle size exceeded 500 μm, and this was attributed to the fact that intraparticle diffusional resistance was practically negligible for particles with size beyond 600 μm . In some recent reports about DFMs for ICCU applications, DFMs powders with an average particle size of 0.1–0.5 mm have been synthesized by the wet impregnation method, and this particle size could be suitable. − Herein, Ni-CaO DFMs pellets with a medium average size of 0.8–1.25 mm were prepared for ICCU-RWGS applications, and the specific procedures for synthesis are depicted in Figure S1.…”

“…36−38 For instance, Dinda et al confirmed that the CO 2 adsorption capacity of the Zeolite-13X adsorbent showed no significant variation when the particle size exceeded 500 μm, and this was attributed to the fact that intraparticle diffusional resistance was practically negligible for particles with size beyond 600 μm. 38 In some recent reports about DFMs for ICCU applications, DFMs powders with an average particle size of 0.1−0.5 mm have been synthesized by the wet impregnation method, and this particle size could be suitable. 39−41 Herein, Ni-CaO DFMs pellets with a medium average size of 0.8−1.25 mm were prepared for ICCU-RWGS applications, and the specific procedures for synthesis are depicted in Figure S1.…”

“…On the condition that intraparticle diffusional resistance is independent of particle size exceeding 600 μm, CO 2 adsorption depends mainly on mass transfer through the outside part of the particle. 38 The increasing gas velocity facilitates the transfer of more CO 2 molecules from the bulk gas phase to the gas−solid boundary layer, allowing the bulk and film diffusion resistance to be overcome. 54 As a result, the increased CO 2 uptakes of the 5Ni-CaO-P DFMs pellets with increasing WHSV to 135 000 mL/(h•g cat ) are associated with the conquered bulk and film diffusion limitations.…”