A chemically treated limestone and alumino-silicate material were utilized for removal of CO2 from natural gas using a combined adsorption-chemical reaction processes. This functionalized Ca-Al2O3-SiO2 material was characterized according to its crystalline phase, surface area, pore size distribution, and surface morphology. It was the tested against different concentrations of CO2 in CO2-N2 gas streams. This is an abstract of a paper presented at the 2013 AIChE Spring Meeting & 9th Global Congress on Process Safety (San Antonio, TX 4/28-5/2/2013).