The impact of binary water–CO₂ isotherm models on the optimal performance of sorbent-based direct air capture processes

Abstract

Direct air capture (DAC) is an auspicious technology in pursuing negative CO2 emissions. A promising process is temperature vacuum swing adsorption (TVSA) employing amine functionalised adsorbents such as Lewatit® VP...

The cost of direct air capture and storage: the impact of technological learning, regional diversity, and policy.

“…The technical performance estimates are based on the existing literature for all but the solid sorbent technology, for which we used our own modelling as presented in earlier work and briefly discussed in Section 3.2. 11 Because the impact of location on net cost of Energy Technology Laboratory (DOE/NETL), and the Electric Power Research Institute (EPRI). [24][25][26][27][28] Specifically, we used the so-called hybrid costing method, which uses bottom-up costing of the FOAK project costs and then implements a top-down method, using technological learning, to arrive at future, NOAK, project costs.…”

“…We used a model and Lewatit® VP OC 1065 data from previous work to calculate the energy and productivity values of a process optimised for maximum productivity. 11 Here, we adjusted the sorbent volume based on one plate in the chosen contactor design and calculated a heat transfer coefficient using a one dimensional radial approximation around a heat transfer pipe. The parameters used can be found in the ESI Tables S6-S8.…”

Recent advances in direct air capture by adsorption

“…104,[136][137][138][139] Novel mechanistic co-adsorption isotherm models have been introduced accordingly. 140 The effect of water on the regeneration heat has also been discussed. 141 Although porous aminopolymers are widely recognized as the most promising DAC adsorbents, the existence of chemisorbed CO 2 species on the aminopolymer surface is still under debate and requires new experimental proof of assignment.…”

“…However, mathematical descriptions of the enhanced CO 2 and H 2 O co-adsorption are poorly understood, leading to inaccurate modeling. In the past five years, quantitative studies have been conducted on the coadsorption of H 2 O and CO 2 from molecular models, 404 adsorption equilibrium, 140,180,278,405,406 and adsorption kinetics. 138 180 described the adsorption equilibrium on NFC by proposing empirical adjustments to the pure Toth model and introducing two parameters describing the adsorption equilibrium based on Wurzbacher's model.…”

“…(d) Experimental CO 2 adsorption isotherms (markers), at various temperatures (T) and relative humidities (RH), fitted to an empirical literature co-adsorption model. 140 amine-functionalized materials with more efficient experimental and simulation tools.…”