Sorption enhanced reactions

Ordinary water gas shift reaction on top. SEWGS concept on bottom. Figure taken from Integration of SEWGS for carbon capture in natural gas combined cycle. Part A: Thermodynamic performances by Manzolini et. al.

Sorption enhanced methane reforming and water gas shift reaction combines a high temperature CO2 sorbent and a high temperature shift catalyst to produce independent H2 and CO2 streams. Using novel lithiumorthosilicate (Li4SiO4) absorbent. Initial investigations showed CO2 absorption assisted water gas shift reaction at 600 C and simultaneous enhancement of the equilibrium conversion of a thermodynamically unfavorable reaction. Such an adsorbent increased the hydrogen yield two-fold above equilibrium concentrations. Preliminary studies show that the adsorption of CO2 in the sorbent is affected by a competitive increase in CO2 solubility at higher temperatures, affecting the reaction activity. The research is of prime interest in several gasification and reforming industries like Air Products, Praxair, Linde, etc. Use of such adsorbents during the reforming step can reduce the reaction temperature to 600 C (compared to 800-1000 C) while achieving high CH4 conversion to H2, prevent catalyst coking, reduce the need for excess steam, and reduce/eliminate downstream hydrogen purification steps.

Related publications:

  1. ​Investigations to Intensified Hydrogen Production Via Sorption Enhanced Water Gas Shift Reaction
    Snehesh Shivananda Ail, Marco J. Castaldi, Anthony Vallace, Charles Coe, Michael Smith
    The 27th North American Catalysis Society Meeting, New York, New York;2022