Gam. Hussein, SAMARIUM OXIDE CATALYST - FORMATION, CHARACTERIZATION AND ACTIVITY TOWARDS PROPAN-2-OL DECOMPOSITION - AN IR SPECTROSCOPIC STUDY, Journal of the Chemical Society. Faraday transactions, 90(24), 1994, pp. 3693-3697
Citations number
28
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
IR spectroscopy has been used to study the gas-phase reaction products
from the dehydrogenation-dehydration of propan-2-ol over Sm2O3 at tem
peratures between room temperature and 400 degrees C. Sm2O3 was shown
to be a Selective dehydration catalyst at 250 degrees C with decomposi
tion of propan-2-ol to propene (ca. 90%). The Sm2O3 catalyst was obtai
ned as a final decomposition product of Sm(CH3CO2)(3).4H(2)O. The ther
mal decomposition processes up to 800 degrees 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 degrees C and recrystallizes at 195 degrees C. At
350 degrees C, the anhydrous acetate decomposes to SmO(CH3CO2) via th
e intermediate Sm(OH)(CH3CO2)(2). At 450 degrees C two different phase
s of Sm2O2(CO3) are obtained which when further heated to 675 degrees
C form Sm2O3. Surface area measurement and scanning electron microscop
y showed that the final product,Sm2O3, at 800 degrees G has a surface
area of 35 m(2) g(-1) and is a crystalline porous material.