Dener Albuquerque, Setembro/2019 Tese de Doutorado – PPGCEM 6. CONCLUSÕES
No presente trabalho foram desenvolvidos quatro transportadores sólidos de oxigênio à base de titanatos de Ferro e óxido misto de cobre e titânio sintetizados pelo método dos precursores poliméricos. Em seguida, os transportadores de oxigênio foram caracterizados e avaliada a sua reatividade, a fim de selecionar as melhores amostras para aplicar à tecnologia de combustão por recirculação química (CLC). Diante disto, as seguintes conclusões foram pontuadas:
✓ Com a análise dos resultados, é possível constatar que o método dos precursores poliméricos foi eficiente na preparação dos titanatos de ferro e do óxido misto de cobre e titânio.
✓ As técnicas de FRX indicou que os transportadores de oxigênio a base de titanatos de ferro tem como fase ativa o óxido de ferro na forma de hematita (Fe2O3) e para o óxido misto de cobre e titânio o CuO.
✓ As análises de DRX com o refinamento Rietveld indicaram que para todos os transportadores de oxigênio à base de titanatos de ferro houve a formação do Fe2TiO5 (pseudobrokita), Fe2O3 (Hematita) e TiO2 (Rútilo) como principais fases cristalinas, mas com pequenas variações em massa das fases principais. E para o óxido misto de cobre e titânio houve a formação do óxido de cobre (CuO), óxido de titânio (TiO2) e(Ti3O5).
✓ A espectroscopia de Mossbouer revelou que a fase presente nos titanatos de ferro é a peseudobrokita e a hematita com valência em Fe+3 mesmo utilizando Fe+2 e Fe+3 nas sínteses das amostras.
✓ Com relação a análise de TPR, pode-se observar que o método de preparação dos titanatos de ferro não apresenta uma influência significativa na distribuição da fase ativa ao longo dos picos de redução, com uma pequena diferença para o TFNCl, que apresentou um quarto pico de redução.
✓ Quanto à reatividade dos óxidos mistos de cobre e titânio e dos titanatos de ferro com o metano, ambos apresentaram alta conversão do sólido durante as etapas de redução e oxidação, com elevados índices de velocidades.
✓ Pelas características estruturais e pelos testes de reatividade desses materiais, conclui-se que tanto os titanatos de ferro como o óxido misto de cobre e titânio possuem os requisitos necessários para serem utilizados nos processos de combustão por recirculação química (CLC).
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Dener Albuquerque, Setembro/2019 Tese de Doutorado – PPGCEM ANEXO
- DRX refinados
Titanatos de ferro e óxido misto de cobre e titânio calcinados a 900 °C
Fonte: Próprio autor
Titanatos de ferro e titanatos de cobre reduzidos com CH4
Dener Albuquerque, Setembro/2019 Tese de Doutorado – PPGCEM
Titanatos de ferro e titanatos de cobre regenerados pós TGA