Recent advances in lithium containing ceramic based sorbents for high-temperature CO₂ capture

Abstract

Recently, lithium containing ceramic based high-temperature CO2 sorbents have received tremendous attention due to their high CO2 capture capacity, low regeneration temperatures, and relatively high stability.

Lithium silicate nanosheets with excellent capture capacity and kinetics with unprecedented stability for high-temperature CO2 capture

“…[2][3][4] Low-temperature sorbents (based on amines, silica, zeolites, carbon, and MOFs) are mainly used for postcombustion CO 2 capture from ue gas at low temperatures (25 to 75 C), while high-temperature sorbents are specically developed for pre-combustion capture between 500 and 700 C. [2][3][4] "Pre-combustion capture" is one of the most challenging but best ways to tackle climate change as CO 2 is captured during the process at high temperatures with ideally zero release into the environment. [5][6][7] Pre-combustion capture is potentially less expensive than post-combustion capture, as CO 2 gets captured as soon as it is produced during the process without releasing it into the environment. [5][6][7] Although a large body of work has been carried out for postcombustion low-temperature CO 2 capture, 2 there are very few high temperature pre-combustion CO 2 capture processes.…”

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

“…to form NaHCO3 or KHCO3 at temperatures < 100 °C [79]- [86]. Li is typically investigated in ternary metal oxide systems [54], e.g. Li2ZrO3 or Li4SiO4, as is discussed in Section 5.3.…”

“…This raises the question as to whether the use of high lithium content materials is feasible as their full regeneration could lead to higher energy penalties incurred in their use. While it is beyond the scope of this review to fully explore all studies on Li and Na containing oxides, readers are directed to a number of excellent recent reviews that cover these materials in much more depth [54], [481].…”

“…CaO-based sorbents are by far the most widespread in terms of research literature, much of which is focused on the optimization of the archetypal CaO on an industrial process scale; for summaries of this work, we refer to a number of review papers [40]- [50] and also to papers covering specifically Mg- [51], [52] and Li-based [53], [54] sorbents. In contrast, this review will investigate questions at a much more fundamental level, including the influence of material structure, ionic conduction and particle morphology on CO2 absorption, and how the structural and operando analysis of a wide range of Ca, Mg and Li containing materials reveals trends tying performance to these chemo-physical properties.…”

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

“…To increase the useful energy of these system and decrease the operating costs, intermediate-temperature and high-temperature sorbents, including hydrotalcites [4], MgO-based sorbents [5], calcium oxides [6][7][8][9], and ceramic materials [10][11][12], have been examined as alternative sorbents because these materials can directly separate CO2 from hot flue gases in thermal power or sorption-enhanced steam methane reforming (SE-SMR) processes. Alkaline ceramic materials [13], especially lithium orthosilicate (Li4SiO4) [14,15], appear to be attractive sorbents because they have high theoretical CO2 capture capacities (36.7 wt.%), and a consistent recyclability.…”