Enhanced Solid Sorbent
Remedium has developed solid sorbents that can capture carbon dioxide effectively, and economically. Remedium’s lab-scale testing showed that its developed sorbents can maintain uptake capacity of 3 times higher than natural sorbents after 100 cycles.
Problem we are solving
Calcium looping is considered a promising method for mitigation of carbon dioxide from high temperature post-combustion flue gases. Failure to remain active over cyclic carbonation and calcination experiments is the major impediment for large-scale application of the calcium looping process. This is because rapid deactivation of the sorbent necessitates replacing them frequently with fresh materials increasing the process operating cost.
To this end, much effort has been put into development of sorbents that are able to maintain a high sorption capacity over cycles. The sorption capacity and stability of CaO sorbents are highly dependent on the properties of the sorbent (e.g. surface area, porosity, pore volume, crystallite size, and composition). The loss of the sorption capacity has been attributed to sintering of the sorbents during calcination at high temperatures, which results in a loss of the surface area and pore volume and in turn, the uptake capacity. Additionally, attrition and particle elutriation are major issues resulting in loss of sorbent and uptake capacity in practical applications in fluidized beds. Sintering promotes agglomeration of CaO grains, resulting in changes in the particle morphology.
The main approach adopted by our researchers at Remedium for improvement of the sorbent properties is incorporation of sintering resistant inert supports into the CaO particles. The role of these supports is to inhibit the sintering of the CaO particles by separating the CaO grains in the crystalline structure.
How we have developed our sorbent
We at Remedium have developed our sorbents through comprehensive experimental investigations. we have investigated two important factors for implementation of the calcium looping process in industrial settings: 1) the stabilizing effect of metal additives to CaO-based sorbents for the calcium looping process; and 2) the performance of the synthetically produced sorbents in a reactor setting to elucidate the potential of CaO-based sorbents in more industrially relevant conditions.
To make a fair comparison, sorbents were synthesized with different metal stabilizers including an identical molar ratio of metal stabilizer to calcium oxide (M:Ca). The sorbents were tested under harsh calcination conditions to demonstrate practical application of the materials under industrially relevant contexts. Carbonation breakthrough profiles were obtained to assess the CO2 capture performance of the sorbents in the reactor.
In addition, the long-term performance of the pellets was investigated in up to 100 cycles of carbonation and calcination in a thermogravimetric apparatus.
Why you should choose our sorbent
Remedium’s lab-scale testing showed that its developed sorbents can maintain uptake capacity of 3 times higher than natural sorbents after 100 cycles. Remedium’s sorbent has several other use cases beside carbon capture battery. Remedium’s sorbent can replace natural sorbents in calcium looping technology since natural sorbents’ failure to remain active over several cycles of carbonation and calcination is the major impediment for large-scale application of the calcium looping process. In addition, the developed sorbent is capable of capturing carbon dioxide from a wide range of flu gases and can be used for several applications such as blue hydrogen production, pre- and post-combustion carbon capture, and DAC (e.g. Carbon Engineering)direct air capture. Additionally. the spent sorbents are reused in the cement industry for clinker production (i.e. no waste), whereas conventional amine systems produce up to 2 kg of waste amines per tonne of carbon dioxide. This creates a huge opportunity for decarbonization of the cement manufacturing process.
