The thermodynamic standard enthalpy change Δ H~ o_m and entropy change Δ S~ o_m of adsorption reaction were both below zero, suggesting that adsorption reaction was an exothermic one and tended to be more in ordered state. 吸附反应的焓变ΔHom和熵变ΔSom均小于零,为放热反应,反应向更有序状态进行;