Catalisadores multifuncionais baseados em perovskitas dopadas com cobre e potássio
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Data
2019-06-12
Autores
Potensa, Bruno dos Santos
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Universidade Estadual Paulista (Unesp)
Resumo
O SrTiO3 é um material bastante versátil, com potencial de aplicação em diversas áreas, inclusive na catálise heterogênea. Este trabalho tem como objetivo estudar os compostos SrTiO3 e Sr1-xKxTi1-yCuyO3-δ, em que x = 0,10 ≤ x ≤ 0,50 e y = 0,05, como catalisadores para síntese do biodiesel. Os compostos foram sintetizados pelo método Pechini. A técnica de difração de raios X mostrou a formação da fase perovskita de SrTiO3, entretanto os compostos Sr1-xKxTi1-yCuyO3-δ apresentaram fases secundárias de CuO, K2Ti8O17 e SrCO3. Os espectros de absorção na região do infravermelho dos compostos sintetizados mostraram bandas características da ligação Ti-O e Sr-O, confirmando a formação do SrTiO3. A técnica de microscopia eletrônica de varredura mostrou que a morfologia do composto SrTiO3 e dos compostos dopados é anômala. Todos os compostos estudados mostraram atividade catalítica na síntese do biodiesel via rota etílica, com exceção ao composto SrTiO3. O composto Sr0,7K0,3, Ti0,95Cu0,05O3-δ apresentou o melhor resultado, com uma conversão de 99%.
SrTiO3 is a very versatile material, with potential applicationin several areas, including heterogeneous catalysis. This work aims to study the compounds SrTiO3 and Sr1-xKxTi1-yCuyO3-δ, on that x = 0.10 ≤ x ≤ 0.50 and y = 0.05, as catalysts for synthesis of biodiesel. Compounds were synthesized by the Pechini method. The X-ray diffraction technique showed the formation of theperovskite phase of SrTiO3, However, the compounds Sr1-xKxTi1-yCuyO3-δ presented secondary phases of CuO, K2Ti8O17 and SrCO3. The absorption spectra in the infrared region of thesynthesized compounds showed characteristic bands of the Ti-O and Sr-O bonding, confirming the formation of the SrTiO3. The scanning electron microscopy technique showed that the morphology of the SrTiO3 compound and the doped compounds are anomalous. All the compounds studied showed catalytic activity in thesynthesis of biodiesel via ethylic route, with the exception ofthe SrTiO3 compound. The compound Sr0,7K0,3Ti0,95Cu0,05O3-δ presented the best result, with a conversion of 99%.
SrTiO3 is a very versatile material, with potential applicationin several areas, including heterogeneous catalysis. This work aims to study the compounds SrTiO3 and Sr1-xKxTi1-yCuyO3-δ, on that x = 0.10 ≤ x ≤ 0.50 and y = 0.05, as catalysts for synthesis of biodiesel. Compounds were synthesized by the Pechini method. The X-ray diffraction technique showed the formation of theperovskite phase of SrTiO3, However, the compounds Sr1-xKxTi1-yCuyO3-δ presented secondary phases of CuO, K2Ti8O17 and SrCO3. The absorption spectra in the infrared region of thesynthesized compounds showed characteristic bands of the Ti-O and Sr-O bonding, confirming the formation of the SrTiO3. The scanning electron microscopy technique showed that the morphology of the SrTiO3 compound and the doped compounds are anomalous. All the compounds studied showed catalytic activity in thesynthesis of biodiesel via ethylic route, with the exception ofthe SrTiO3 compound. The compound Sr0,7K0,3Ti0,95Cu0,05O3-δ presented the best result, with a conversion of 99%.
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Palavras-chave
Titanato de estrôncio, Método pechini, Cobre, Potássio, Biodiesel, Strontium titanate, Pechini method, Copper, Potassium