Thermal decomposition of precursors and iron oxide properties
作者： Dalila dos Santos Monteiro , Marluce Oliveira da Guarda Souza
DOI: 10.1007/S10973-015-4840-5
关键词:
摘要: In this work, manganese and copper promoter effect was investigated over iron oxide obtained by thermal decomposition of iron(III) hydroxoacetate (nominal ratio Fe/Mn = 10 Fe/Cu 10). The solids were characterized X-ray fluorescence, analysis (TG, DTG, DTA), Fourier transform infrared spectroscopy (FTIR), physisorption experiments, thermoprogrammed reduction powder diffraction. During the precursor process, step referred as dehydration/dehydroxylation controlled volatile species diffusion. Decomposition stage [Fe(III) to Fe(II) reduction] solid geometry particle size (Coats–Redfern model). FCA-C sample showed Fe(II)/Fe(III) highest ratio, indicating that through process is favored. With use Ozawa Kinssinger methods, it became clear FMCA lowest activation energy value leading FMCA-C with higher specific surface area pore volume than oxide-free dopants. reduces hematite magnetite (low temperature) easily shows stability under reductive conditions.
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