Biomass is a renewable and worldwide-abundant energy resource that shows great potential for environmentally benign power generation by minimizing greenhouse gas emissions. A “one-box” process has been proposed and studied in order to economically produce pure hydrogen from biomass-derived syngas in the presence of its common impurities through the use of the water gas shift (WGS) reaction. The heart of the process is a catalytic membrane reactor making use of carbon molecular sieve (CMS) membranes and an impurity-tolerant commercial Co/Mo/Al2O3 catalyst. CMS membrane stability was investigated in the presence of model tar and organic vapor compounds at experimental conditions similar to the WGS reaction environment. Experimental studies were carried out utilizing simulated biomass-derived syngas containing H2S and NH3 as key impurities, which was fed into the catalytic membrane reactor to produce a contaminant-free hydrogen product using the WGS reaction. The reactor performance has been investigated for...