AEWGS is a reaction that combines the WGS reaction and CO(2) capture by a solid absorbent to produce high purity H(2) from synthesis gas in one single step at 600-800 degrees C. This reactor system, if homogeneous, would not require a catalyst. However, previous research on this concept was not conclusive, since a steel reactor was used and reactor walls were suspected to act as catalyst. Therefore, there is a need to address this issue and to select and evaluate suitable CO(2) absorbents for this concept. AEWGS was studied using a quartz-made fixed-bed reactor at; SV = 3000 h(-1), feed; 5% CO, 15% H(2)O, balance He-N(2) at 600 degrees C, 1 atm. CO(2) absorbents tested were CaO*Mg0, and Na(2)ZrO(3). Empty quartz-reactor tests leaded to conclude that a catalyst is needed for the WGS at temperatures of interest. A 97% H(2) product was obtained with calcined dolomite suggesting this last to act as a WGS catalyst. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.