Novel CO₂ Absorbents Using Lithium‐Containing Oxide

Abstract

We have discovered a series of lithium‐containing oxides that immediately react with ambient carbon dioxide (CO2) up to 700°C. The products react and return reversibly to the oxides at a temperatures higher than about 700°C. The absorption capacity surpasses that of other CO2 absorbents by a factor of 10. Utilizing these absorbents, the possibility of a CO2 separation system that operates at around 500°C is proposed. It is generally believed that a CO2 separation process operable at temperatures higher than 500°C has the special benefit of a small energy penalty. Moreover, the absorption also proceeds at ambient temperature in the atmospheric environment. This property offers the possibility of many other applications, such as air cleaners or cartridges. Therefore, we think these materials have the potential to make a valuable contribution to the realization of CO2 emission control.

Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

“…The lithium silicate showed good capturing capacity for the CO 2 at pre-combustion temperature conditions. The observed results of capturing capacity of lithium silicate for the CO 2 are also supported by the reported values in the literature 1) [6][7][8][9][10][11][12][13][14]. In lithium silicate, lithium plays an important role in capturing the CO 2 by forming lithium carbonate and then its decomposition in the presence of silica at high temperature.…”

“…Aluminum and iron doped in lithium silicate have been explored for capturing carbon dioxide from flue gases. Lithium silicate has been demonstrated as an excellent adsorbent for the capture of carbon dioxide [10][11][12][13]. The hydrotalcite containing calcium or magnesium and aluminum are good adsorbents for capturing carbon dioxide in the temperature range 100°C-500°C.…”

Carbon dioxide capture and utilization in petrochemical industry: potentials and challenges

“…Several adsorbents have been proposed for CO 2 capture, including carbon fiber monolithic adsorbents [34], activated carbon fiber-phenolic resin composites [35], melamine-formaldehyde highly porous adsorbents [36], amine immobilized adsorbents [37], red mud [38], steam-activated anthracite [39], activated carbon [40], lithium zirconate [41], lithium silicate [42,43], alumina, metallic oxides and zeolites [44] among others [45,46]. Sjostrom and Krutka [47] compared several adsorbents and concluded that carbon-based materials present excellent stability, while zeolites work well under dry conditions.…”

Catalytic Steam Reforming Technology for the Production of Hydrogen and Syngas

“…Li 2 ZrO 3 synthetic sorbents are also reported in literature with better multicycle stability, but the costs are prohibitive. 79,82 Kusakabe et al 83 proposed selective CO oxidation membrane concept to facilitate SMR reaction. Yttria -stabilized zirconia (YSZ) membrane was deposited on the surface of a porous alumina support tube by sol -gel procedure.…”