Journal of the Chemical Society - Faraday Transactions p. 1385 - 1390 (1995)
Update date:2022-08-30
Topics:
Hussein, Gamal A. M.
PrO1.833 and Pr2O3 catalysts have been obtained as final decomposition products of Pr2(C2O4)3*10H2O in different gases (O2, N2 and H2).The decomposition processes were characterized by thermogravimetric (TG) and differential thermal analysis (DTA), X-ray diffraction (XRD) and IR spectroscopy of the solid-phase products.The results indicate that the compound dehydrates in three steps at 100, 150 and 380 deg C and that the anhydrous oxalate decomposes at 445 deg C to form two phases of Pr2O2(CO3) depending upon the atmosphere used for the reaction.On further heating PrO1.833 is formed at 550 deg C in O2 and at 650 deg C in N2.In contrast, Pr2O3 was formed at 650 deg C in H2.Surface area measurements and scanning electron microscopy (SEM) have shown that PrO1.833 produced at 700 deg C has a different surface area depending on the gas used: 43 and 64 m2 g-1 for O2 and N2, respectively.The surface area of Pr2O3 formed in H2 is 59 m2 g-1.The texture of the catalyst has been found to depend upon the decomposition atmosphere.IR spectroscopy has been used to analyse (qualitatively and quantitatively) the gas-phase reaction products between room temperature and 400 deg C from the dehydrogenation and dehydration reactions of propan-2-ol over PrO1.833 and Pr2O3 catalysts.The results revealed that Pr2O3 is a selective dehydration catalyst at 275 deg C, decomposing propan-2-ol into propene (ca. 80percent).However, PrO1.833 is a dual function dehydration/dehydrogenation catalyst.
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