Adsorptive separation of water from CO2 is an appealing alternative to liquid absorbers for post-combustion capture systems. In all cases, the purified CO2 stream from a PCC system will have a high moisture content and, due to equipment corrosion issues and the risk of hydrate formation, the CO2 stream must be rigorously dried prior to being compressed. This work reports the first study on solid adsorbent selection for CO2 drying using low grade heat and ambient air as a regeneration gas. Different types of adsorbents, chosen for their range of water adsorption characteristics, have been investigated for the desiccation of a pure CO2 stream. When destined for sequestration the CO2 product gas has little value and so the drying process should require no supporting process operations and should consume little additional energy. However, due to the costs and complexity of separating and purifying CO2 from a flue gas stream, the drying process should return as much CO2 as possible to the compression stage. An ideal desiccant for CO2 drying should have a high moisture capacity and selectivity and should be regenerable using waste heat and ambient, humid air. The CO2 drying performance of Na-, Ca-, and Ca/H- forms of ETS-10 were compared to that of commercial silica and 4A zeolite. Ca-ETS-10 was found to have the highest moisture capacity using a temperature swing of 30-70 degrees C and a CO2 feed stream of 50-100% relative humidity. Due to the intrinsic selectivity for water over CO2 on solid adsorbents, all desiccants tested had a CO2 recovery greater than 95%. (C) 2013 Elsevier B.V. All rights reserved.