(189d) Investigation of Mixed Metal Oxides as CO2 Adsorbing Materials for Sorption Enhanced Water-Gas-Shift Reaction

Sorption enhanced water-gas-shift (SEWGS) reaction process could potentially allow the complete conversion of syngas to hydrogen while simultaneously capturing carbon dioxide. The SEWGS offers several advantages such as minimal use of catalyst in WGS reaction, alleviation of gas cooling step for successive CO2 capture and reheating for power generation afterwards. A key technical issue for advancing the SEWGS is to identify and develop high-performance, high-efficiency sorbents with properties suitable for CO2 capture at high pressure and high temperature syngas conditions typically encountered upstream of a conventional WGS reactor. Individual metal oxides such as CaO, MgO, Li2ZrO3 and many others have been extensively researched for CO2 capture for SEWGS application. In this presentation, we report properties of mixed metal oxides for CO2 capture applications under typical conditions of SEWGS. Kinetic and thermodynamic properties of different classes of mixed metal oxides will be described. In addition, the impact of hydrogen on CO2 uptake properties of the most promising mixed oxides will be also addressed.