Two microporous carbon molecular sieve(CMS)samples with different surface properties were obtained from a commercial CMS through deashing treatment(C1)and then oxidation(C2)by 30%H2O2 solution.Both the two samples were characterized by acidic/basic titration,N2 adsorption isothermal(BET),point of zero charge(pHPZC).Decomposition of H2O2 in dilute unbuffered solution was carried and the evolved oxygen was measured volumetrically.After oxidation,the surface acidity and total surface oxygen-containing groups increased,while the special surface area and total pore volume slightly decreased.The experimental results showed that the H2O2 decomposition reaction on CMS obeyed the first-order kinetic.The activation energy(Ea)of the decomposition reaction on oxidized CMS increase from 33.3(C1)to 45.5(C2)kJ.mol-1,however the negative value of activation entropy of the reaction(ΔS≠)decreased from-197(C1)to-159(C2)J.mol-1.K-1 calculated by transition state theory.
