How can we separate carbon monoxide from wood gas?
This master's thesis by Dahiru Rufai Ahmed at the university of Oulu provides a comprehensive background into the removal of CO2 from wood gas.  

On pages 36-37 it mentions the water-gas shift (WGS) reaction as a method of adjusting the hydrogen/carbon monoxide mixture or removing CO entirely to get pure H2.  "The WGS reaction is an exothermic reaction
(∆Hr = -41.1 kJ/mol) that converts excess carbon monoxide into hydrogen."

CO + H2O -->  CO2 + H2 + heat

"At low temperature the reaction can be catalyzed by catalysts based on copper, aluminum and zinc oxides. (Basu, P. (2010). Biomass gasification and pyrolysis: Practical Design and Theory. 1st ed., Elsevier Inc. 365pp. ISBN: 9780123749888.) 

However, in recent times, interest has been shifted to a catalyst-membrane system that incorporates the WGS reaction and H2 separation via a hydrogen selective membrane (Mendes, D., Chibante, V., Zheng, J-M., Tosti, S., Borgognoni, F., Memdes, A. and Madeira, L. M. (2010). Enhancing the production of hydrogen via water-gas shift reaction using Pd-based membrane reactors. Inter J Hydrogen Energy. 35 (22), 12596–12608.)."

This article describes a membrane based catalyst for the WGS reaction.  The catalyst in the membrane uses Palladium alloys with Silver and Copper due to their higher selectivity and permeability to Hydrogen.

Since Palladium is an expensive noble metal and since catalytic converters for automobiles already use Palladium for CO oxidation, I am considering using an automobile catalytic converter (CAT) for this purpose.  The CAT uses oxidation rather than WGS to convert CO, so I am concerned that it would also oxidize the hydrogen.  However, I think the CAT would perform WGS if the input gas mixture is lacking oxygen which would be the case for wood gas.  Any useful comments and feedback appreciated.