화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.11, No.6, 918-925, November, 2005
Characterization and Catalytic Properties of Vanadia/Titania Xerogel Catalysts for Ammoxidation of m-Xylene
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Vanadia/titania composite xerogel catalysts prepared by the alkoxide and non-alkoxide sol-gel process were evaluated as catalysts in a fixed-bed reactor for the gas phase ammoxidation of m-xylene in a temperature range from 573 to 698 K. The effects that the reaction temperature and the vanadia loadings had on had the reactino characteristics were investigated. A maximum yield of 73% of isophthalonitrile (IPN) was obtained using a vanadia loading of 3 wt% at 648 K with a contact time of 0.5 s. The vanadia/titania xerogel catalysts were characterized through nitrogen adsorption-desorption, temperature-programmed reduction (TPR), X-ray diffraction (XRD), and scannign electronic microscpy (SEM) analyses to explain their excellent catalytic performance in comparison with those of conventionally impregnated catalysts.
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