Utilization of zeolite as a potential multi-functional proppant for CO2 enhanced shale gas recovery and CO2 sequestration: A molecular simulation study of the impact of water on adsorption in zeolite and organic matter

•Water can impact the CO2/CH4 competitive adsorption in silicalite and kerogen.•Water can enhance CO2/CH4 selectivity under some circumstances.•Kerogen prefers CO2 over CH4 than silicalite-1 doe with water presence.•CO2-loaded Silicalite can potentially replace adsorbed CH4 from shale.