Sorption isotherms of hydrocarbon and carbon dioxide(CO_2) provide crucial information for designing processes to sequester CO_2 and recover natural gas from unmineable coal beds.Methane(CH_4),ethane(C_2H_6),and CO_2 adsorption isotherms on dry coal and the temperature effect on their maximum sorption capacity have been studied by performing combined Monte Carlo(MC) and molecular dynamics(MD) simulations at temperatures of308 and 370 K(35 and 97 ℃) and at pressures up to10 MPa.Simulation results demonstrate that absolute sorption(expressed as a mass basis) divided by bulk gas density has negligible temperature effect on CH_4,C2H6,and CO_2 sorption on dry coal when pressure is over 6 MPa.CO_2 is more closely packed due to stronger interaction with coal and the stronger interaction between CO_2 molecules compared,respectively,with the interactions between hydrocarbons and coal and between hydrocarbons.The results of this work suggest that the “a” constant(proportional to T~2_c/Pc) in the Peng-Robinson equation of state is an important factor affecting the sorption behavior of hydrocarbons.CO_2 injection pressures of lower than8 MPa may be desirable for CH_4 recovery and CO_2sequestration.This study provides a quantitative understanding of the effects of temperature on coal sorption capacity for CH_4,C_2H_6,and CO_2 from a microscopic perspective. Sorption isotherms of hydrocarbon and carbon dioxide (CO_2) provide crucial information for designing processes to sequester CO_2 and recover natural gas from unmineable coal beds.Methane (CH_4), ethane (C_2H_6), and CO_2 adsorption isotherms on dry coal and the temperature effect on their maximum sorption capacity have been studied by performing combined Monte Carlo (MC) and molecular dynamics (MD) simulations at temperatures of 308 and 370 K (35 and 97 ° C) and at pressures up to 10 MPa. Simulation results demonstrate that absolute sorption (expressed as a mass basis) divided by bulk gas density has negligible temperature effect on CH_4, C2H6, and CO_2 sorption on dry coal when pressure is over 6 MPa .CO_2 is more closely due due stronger with coal and the stronger interaction between CO_2 molecules than , respectively, with the interactions between hydrocarbons and coal and between hydrocarbons. The results of this work suggest that the “a” constant (proportional to T ~ 2_c / Pc) in the Peng-Robinson equation of state is an important factor affecting the sorption behavior of hydrocarbons. CO 2 injection pressures of lower than 8 MPa may be desirable for CH 4 recovery and CO 2 acquisition. This study provides a quantitative understanding of the effects of temperature on coal sorption capacity for CH_4, C_2H_6, and CO_2 from a microscopic perspective.