(280b) Catalytic Regeneration of Aqueous Potassium Sarcosinate Solvent to Improve Energy Efficiency of CO2 Direct Air Capture
AIChE Annual Meeting
2023
2023 AIChE Annual Meeting
Transport and Energy Processes
CO2 Capture, Utilization, and Disposal: Key to Clean Energy Production
Tuesday, November 7, 2023 - 8:20am to 8:40am
The experimental procedure involved heating 100-mL CO2-loaded 3M K-SAR solvent on a heater-stirrer with or without catalysts. Various catalytic materials were used in these tests to evaluate their effectiveness: Fe2O3, TiO2, SiO2, and Fe-ZSM-5 (0.5g catalyst for 100 mL of solvent). The extent of solvent regeneration and its kinetics were determined by analyzing the CO2 content in the evolved gas with a CO2 sensor, as well as solvent samples via an acid-base titration. Combined thermogravimetric analysis (TGA-DSG) and FTIR experiments were also performed to quantify the overall regeneration energy and isolate the contributions of ÎHsen, ÎHvap, and ÎHdes.
Results obtained with Fe-ZSM5 catalysts showed that 30% better solvent regeneration, in terms of energy requirements, can be achieved in the presence of the catalyst than without it. These preliminary results clearly demonstrate that the regeneration energetics and kinetics of K-SAR solvent can be improved significantly by a catalyst. Such a concept of catalyst-assisted regeneration can also be extended to other common CO2-capture solvents investigated for point-source capture, such as MEA.