A novel rotating coil-shaped spiral gas-solid contacting device was proposed. A cold model of 1.5-cycle spiral structure was made by combining 180" elbows of half-octagonal shape using ID 24mm transparent plastic tubing. Spherical adsorbent (zeolite) particles were packed in the spiral. CO2 was pulse-injected in a nitrogen stream to measure the removal efficiency of CO2 by adsorption. The same procedure was conducted with a uniformly packed bed in a vertical tube of the same diameter. Adsorption kinetics was determined from the removal of CO2 observed in the uniformly packed bed. The fraction of CO2 removed in the spiral reactor was lower than that in the uniformly packed bed under the same solid volume/gas feed rate conditions. The difference was attributed to the non-uniform shape of the packed bed in the spiral; a shortcut in the gas stream was formed in the spiral. A model to estimate the pressure drop in the spiral proposed by the present authors was applied to estimate the removal of CO2. The model agreed with the experimental results or slightly underestimated CO2 removal in the spiral.