Journal of the Chemical Society - Faraday Transactions p. 3693 - 3698 (1994)
Update date:2022-08-11
Topics:
Hussein, Gamal A. M.
IR spectroscopy has been used to study the gas-phase reaction products from the dehydrogenation-dehydration of propan-2-ol over Sm2O3 at temperatures between room temperature and 400 deg C.Sm2O3 was shown to be a selective dehydration catalyst at 250 deg C with decomposition of propan-2-ol to propene (ca. 90percent).The Sm2O3 catalyst was obtained as a final decomposition product of Sm(CH3CO2)3*4H2O.The thermal decomposition processes up to 800 deg C were characterized by the thermogravimetry (TG), differential thermal analysis (DTA), X-ray diffraction (XRD) and IR spectroscopy.The compound dehydrates in two steps at 125 and 170 deg C and recrystallizes at 195 deg C.At 350 deg C, the anhydrous acetate decomposes to SmO(CH3CO2) via the intermediate Sm(OH)(CH3CO2)2.At 450 deg C two different phases of Sm2O2(CO3) are obtained which when further heated to 675 deg C form Sm2O3.Surface area measurement and scanning electron microscopy showed that the final product, Sm2O3, at 800 deg C has a surface area of 35 m2 g-1 and is a crystalline porous material.
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