Emprego de óxidos tipo perovskita nas oxidações do propano e CO

Química Nova

Paulo Roberto Nagipe Da Silva¹ 

[1],Universidade Estadual do Norte Fluminense Centro de Ciência e Tecnologia Campos dos Goytacazes RJ

关键词: perovskites;    CO oxidation;    propane oxidation;   

DOI  :  10.1590/S0100-40422004000100007

来源: SciELO

【 摘 要 】

Simultaneous oxidation/co-precipitation of an equimolar mixture of La(III) and Co(II) nitrates and La(III) nitrate and Mn(II) chloride afforded a hydroxide gel, which was converted to LaCoO3 and LaMnO3 on calcination at 600 °C. After calcination, the obtained perovskites have been characterised by X-ray diffraction (XRD), X- ray photoelectron spectroscopy (XPS), thermogravimetric analysis (DTA - TGA) and BET specific surface determination. Specific surface areas of perovskites were 12 - 60 m²/g. XRD analysis showed that LaCoO3 and LaMnO3 are simple phase perovskite - type oxides. Traces of LaOCl, in addition to the perovskite were detected in the LaMnO3. The catalytic behavior was examined in the propane and CO oxidation. The LaCoO3 catalyst was more active to CO2 than the LaMnO3 catalyst.

【 授权许可】

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