Add time:07/18/2019         Source:sciencedirect.com

The porous and high surface area of lanthanum oxide was obtained as a final decomposition product of lanthanum acetylacetonate tetrahydrate. The decomposition course in dry nitrogen was thoroughly studied. Thermal processes occurring throughout the decomposition range (100–800 °C) were monitored by thermogravity; differential thermal analysis and infrared spectroscopy gaseous products. These processes were characterized on the basis of the solid products analyses, using X-ray diffractometry and IR-spectrometry. The results showed La(C5H7O2)3 completely decomposed to La2O3 at 730 °C, through amorphous and unstable intermediates La(CH3COO)(C5H7O2)2 at 190 °C, La(CH3COO)2(C5H7O2) at 225 °C, La(CH3COO)3 at 285 °C, La2(CO3)3 at 390 °C and crystalline and stable La2O2(CO3) at 430 °C. Gas phase decomposition products included propyne, acetone, carbon oxides, methane and isobutene. Methane and isobutene resulted from interfacial reactions involving the initial product (acetone). The ultimate products, La2O3 at 700 °C and 800 °C, are crystalline porous solids and having a surface area of 21 and 45 m2/g respectively.

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