Case Number 108028 - Sulfur Tolerant High Durability CO2 Sorbents

Contact: Doug Nienaber
Phone: 513-558-3098

Description:  Dr. Smirniotis and his students at UC have designed and developed a novel CaO-based sorbents that have demonstrated the highest ever recorded CO2 uptake capacity. In order to control the greenhouse effect the most viable solution is to find cost effective ways to capture and sequestrate CO2 before it is released into the atmosphere. The most common commercial technology to capture CO2 is an amine-based absorption process. This process is limited to small scale (102 ton/day) and low temperatures between 323 K and 413 K. Alternatively these drawbacks can be overcome by utilizing calcium oxide-based inorganic sorbents to capture CO2 selectively from hot gas streams. These CaO-based sorbents have been shown to be promising candidates for CO2 capture and cost effective. However, the conventional sorbents’ performance decays with each passing carbonation/decarbonation cycle. Currently, a significant amount of research is being carried out to improve the performance of CaO-based sorbents. The focus is on increasing its porosity and stability.

Fossil fuels inevitably contain sulfur (primarily in the form of SO2 and SO3 at much lower concentrations) and sulfation reactions can occur depending on the temperature. However, most studies have not considered the effect of SO2 and other poisons found during the production of energy from fossil fuels.

Dr. Smirniotis and his students at UC have designed and developed a novel CaO-based sorbent. These sorbents retain their structural stability and durability over extended carbonation/decarbonation cycles in a very wide temperature window ranging from 373 to up to 1000 K. Moreover, these sorbents demonstrated excellent stability for operating under severe conditions and other environmental factors which normally reduce effectiveness. These characteristics are achieved through the functionalization of the sorbent’s surface which will repel SO2 and other poisons. The sorbents have also demonstrated very good regenerability, they are inexpensive to make in large quantities, and the synthesis procedure is very reproducible. The CaO-based sorbents developed can be used both for post- and pre-combustion processes.

UC has developed an effective, economic and versatile industrial sorbent process to mitigate CO2, which operates under some of the severest conditions, and has a longer lifetime than current sorbents.

UC has receieved an issued patent, US Patent # 8,114,808 entitled Sulfur tolerant highly durable CO.sub.2 sorbents

The following are publications from Dr. Smirniotis' group related to their sorbent work: