Promoting effect of polyoxyethylene octylphenol ether on Cu/ZnO catalysts for low-temperature methanol synthesis

摘要

Cu/ZnO catalysts were prepared by the co-precipitation method with the addition of OP-10(polyoxyethylene octylphenol ether) and were chemically and structurally characterized by means of XRD,BET,H2-TPR,CO-TPD and N2O-titration.The effect of OP-10 addition on the activity of Cu/ZnO for the slurry phase methanol synthesis at 150 ℃ was evaluated.The results showed that Cu/ZnO prepared with addition of 8% OP-10(denoted as C8) exhibited the promoted activity for the methanol synthesis.The conversion of CO and the STY(space time yield) of methanol were 42.5% and 74.6% higher than those of Cu/ZnO prepared without addition of OP-10(denoted as C0),respectively.The precursor of C8 contained more aurichalcite and rosasite,and the concerted effect of Cu-Zn in C8 was found to be stronger than that in C0.Compared with C0,C8 showed smaller particle size,lower reduction temperature and larger BET and Cu surface areas.