The Structural Morphology of α-MoO3 and its Structure-activity Relationship for Catalytic Production of Pentaerythritol n-Octanoate Ester
Molybdenum trioxide(MoO3)catalyst,which was used for esterification of pentaerythritol(PER)and n-octanoate acid(OTA)to pentaerythritol n-octanoate ester(POE),was prepared by sol-gel method.The α-MoO3 catalyst was produced using the sol-gel technique and temperature control.The structure and morphology of the samples were characterized by XRD,SEM,XPS and FITR.The results showed that calcination temperature had significant influence on crystalline structure,apparent morphology and catalytic properties of α-MoO3.When the calcination temperature is 450 ℃,α-MoO3 with preferred orientation of(021)and(110)crystal planes.The α-MoO3 powder has smooth surface,uniform size and good dispersion and exhibits high catalytic activity.When esterification reaction was carried out at 200 ℃,the molar ratio of n-octanoate to pentaerythritol(n(OTA)/n(PER))of 4,reaction time of 4 h,and n(α-MoO3-450)/n(PER)of 0.005,the conversion of PER can be 98.8％,and the selectivity of pentaerythritol n-octanoate ester is 100％.
α-MoO3sol-gel methodcalcination temperaturemicrostructure and morphologycatalytic performance
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