The promoting effect of titanium silicate(TS-1)molecular sieve and silanized TS-1(TS-1-S)on the homogeneous liquid oxidation of cyclohexane catalyzed by cobalt naphthenate(Co-nap)with oxygen as oxidant was investigated.Both TS-1 zeolites were efficient promoters.The conversion of cyclohexane was 7.9%with a selectivity of 83.7%when it was catalyzed by Co-nap/TS-1-S,and the reaction time was reduced to 130 min as compared to 300 min with Co-nap as the catalyst.The adsorption of Co-nap on TS-1-S,which transfor...