(158h) Lithium Silicates for High Temperature CO2 Capture
AIChE Annual Meeting
2018
2018 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
In Honor of Michael Smith's 60th Birthday II (Invited Talks)
Monday, October 29, 2018 - 2:45pm to 3:00pm
Hydrogen is produced from natural gas (or biomass) by the two-step steam methane reforming (SMR) and the water-gas shift (WGS) reactions This is an ideal opportunity for sorption-enhanced reaction, in which CO2 is chemically fixed to a suitable substrate, thus driving the equilibrium in the WGS shift step to the right. Lithium-based ceramics, notably Li4SiO4, have been evaluated as potential CO2 sorbents fo r this purpose. However, these are bulk-phase materials, once the reaction products cover the surface, adsorption stops. Our approach to improving reversible CO2 sorption is to create a surface lithium-silicate structure on a mesoporous silicate such as SBA-15 or similar materials. Modification of the lithium silicate composition will influence the thermodynamics enabling us to tune the performance of these materials for reversible, high-temperature adsorption of CO2. This talk will review our efforts to develop these materials by direct sol-gel methods, and by atomic layer deposition or incipient wetness of suitable lithium precursors onto mesoporous silicates.