• dehydration of 1,5-pentanediol over rare earth oxides

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     vapor-phase catalytic dehydration of 1,5-pentanediol was investigated over rare earth oxides (reos) at 325–450 °c. the conversion of 1,5-pentanediol over reos calcined at 700 and 800 °c was higher than that calcined at 500 °c. sc2o3, yb2o3, and lu2o3 with cubic bixbyite structure showed the selectivity to 4-penten-1-ol with higher than 74 mol%, while reos with hexagonal and monoclinic structures showed the selectivity with less than 50 mol%. especially, yb2o3 and lu2o3 calcined at 1000 °c showed high formation rate of 4-penten-1-ol per specific surface area over 1 mmol h−1 m−2 at 400 °c. in the yb2o3catalyst calcined at 800 °c, the conversion of 1,5-pentanediol was increased up to 74.4 mol% with increasing contact time, together with stable selectivity to 4-penten-1-ol of 71.8 mol%. in comparing the reactivity of alkanediols to form the corresponding unsaturated alcohols over yb2o3, we found the reactivity of alkanediols into the corresponding unsaturated alcohols was the following order: 1,4-butanediol > 1,3-diols ≫ 1,5-pentanediol ≫ 1,6-hexanediol.

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