Case Number 108028 - Sulfur Tolerant High Durability CO2 Sorbents
Contact: Doug Nienaber
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.
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:
- E. P. Reddy, and P.G. Smirniotis, “Sorption of CO2 by alkali metals doped CaO sorbents”, Journal of Physical Chemistry B, Vol. 108, 7794-7800, 2004
- Roesch, A., Reddy, E.P., and Smirniotis, P.G., “Parametric Study of Cs/CaO Sorbents with Respect to Simulated Flue Gas at High Temperatures” Ind. Eng. Chem. Res., 44, 16, 6485 - 6490, 2005,
- Hong Lu, Ettireddy P. Reddy, and Panagiotis G. Smirniotis, “Calcium Oxide Based Sorbents for Capture of Carbon Dioxide at High Temperatures,” Ind. Eng. Chem. Res., 45, 11, 3944 - 3949; 2006
- H. Lu, A.M. Khan, and P.G. Smirniotis, “Relation between Structral Properties of CaO-based Sorbents obtained from Different Organometallic Precursors,” Ind. Eng. Chem. Res., 47, 16, 6216-6220, 2008