Hm. Ismail, ASSESSMENT OF TEXTURAL CONSEQUENCES ON PRODUCTS OF THERMAL-DECOMPOSITION OF SAMARIUM ACETYLACETONATE, Colloids and surfaces. A, Physicochemical and engineering aspects, 97(3), 1995, pp. 247-254
Textural consequences of the thermal decomposition of Sm(C5H7O2)(3) .
2H(2)O in dry nitrogen have been assessed by the analysis of nitrogen
sorption isotherms, measured at -196 degrees C, for their decompositio
n products obtained at different temperatures (300, 450 and 800 degree
s C), using a number of widely accepted methods. Subsequently, a corre
lation was made of the results with physicochemical properties of the
decomposition products and with the processes occurring during the cou
rse of the decomposition reaction. Thermal processes occurring through
out the decomposition range (100-800 degrees C) were monitored by ther
mogravimetry, differential thermal analysis and infrared (IR) spectros
copic analysis of the gaseous products. These processes were character
ized on the basis of the solid products analyzed using X-ray diffracto
metry and IR spectrometry. The results showed that Sm(C5H7O2)(3) had c
ompletely decomposed to Sm2O3 at 750 degrees C, via the amorphous and
unstable intermediates Sm(CH3COO)(C5H7O2)(2) at 150 degrees C, Sm(CH3C
OO)(2)(C5H7O2) at 235 degrees C, Sm(CH3COO)(3) at 270 degrees C, Sm2O(
CH3COO)(3) at 500 degrees C and Sm2O2(CO3) at 650 degrees C. The gases
evolved in the gas phase included propyne, acetone, carbon oxides, me
thane and isobutene. Methane and isobutene resulted from an interfacia
l reaction involving the initial product (acetone). The final solid pr
oduct Sm2O3 at 800 degrees C is a crystalline porous material, having
a surface area of 47 m(2) g(-1).