Dear Sir. Concerning your issue about the suitable method for CO absorption/separation from CO+H2 mixture. The absorption of carbon monoxide and particularly to the removal of carbon monoxide from a gaseous mixture containing same together with at least one other gaseous material. In a typical embodiment it relates to a process for the separation and recovery of carbon monoxide from a gaseous mixture containing same by absorption in a reagent solution containing a cuprous salt and subsequently desorbing the resulting solution to recover the absorbed carbon monoxide in concentrated or substantially pure form. The most common method is Pressure Swing Adsorption. The selection of the adsorbent material depend on the content of the mixture you are purifying and can vary significantly. The main idea being that the surface of the adsorbents has to attract (adsorb) the undesired product like CO2 under high pressure and let the desired material pass (H2 for example), then when the adsorbent is saturated the control system will start to decrease its pressure and tracked material will leave the column in the waste gas line. Some of the adsorbents commonly used are activated carbon, silica and zeolites, with activated carbon being the most economical one up to my knowledge. An important remark in here is that CO is commonly NOT filtrated this way because it has a week adsorption to commonly used adsorbents. Instead, Gas Shift Reactors are used to react CO with H2O to produce H2 and decrease the concentration of CO is the gas to low levels (typically less than (1-10ppm). I think the following below links may help you in your analysis: