Síntese do cerato de bário pelo método de complexação combinando EDTA-citrato e avaliação catalítica na oxidação do monóxido de carbono testada em reator de leito fixo

Lobato, Maxwell Ferreira; Santos, Andarair Gomes dos; Vital, Angélica Belchior; Souza, Carlson Pereira de

doi:10.1590/0366-69132016623631993

Cited by 3 publications

(6 citation statements)

References 15 publications

(25 reference statements)

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“…However, in the temperature range analyzed, it can be verified that up to 900 ºC the stabilization process still does not occur, requiring a temperature above 900 ºC to obtain the phase. As the perovskite BaCe 0.2 Pr 0.8 O 3 was already obtained by EDTA-citrate followed by calcination at 1000 ºC 9 , the powders obtained in the present work were calcined at 1000 ºC for 5 h. Figure 2 shows the X-ray patterns of BaCe 0.8 Pr 0.05 Cu 0.15 O 3-δ powders obtained with different pH values. It can be observed, regardless of the pH value (acid, neutral or basic), all powders present the barium cerate (79628-ICSD) and barium carbonate (15191-ICSD) phases.…”

Section: Methodsmentioning

confidence: 89%

“…The perovskite of composition BaCe 0.8 Pr 0.05 Cu 0.15 O 3-δ was synthesized by the EDTA-citrate method 9,22,23 using the chemicals listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The high catalytic activity of the perovskite type oxides (PTOs) allows these materials to be used in toluene degradation 8 , carbon monoxide oxidation 9,10 , biodiesel synthesis 11,12 , solid oxide fuel cell cathode material [13][14][15] , and as catalysts for methane reforming 16 . These and other applications and/or properties are derived from the specific characteristics of the perovskite type oxides, especially the ability to adsorb oxygen molecules (oxidation/reduction catalysts) and the presence of structural defects.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of the Perovskite-Type BaCe0.8Pr0.05Cu0.15O3-δ via EDTA-Citrate

Santos

Macedo

et al. 2017

Mat. Res.

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BaCeO 3 -based ceramics are ionic and electronic conductors that can be applied to oxygen sensors, solid oxide fuel cells and oxygen permeable membranes. However, the low chemical stability at high temperatures of these materials motivates studies involving doping of A and/or B sites of the perovskite structure. In this context, the present work aimed to synthesize a new BaCe 0.8 Pr 0.05 Cu 0.15 O 3-δ material using the chemical route of complexation which combines EDTA-Citrate with pH variation. The powders obtained at pH 3 or 11 and calcined up to 900 ºC are thermally unstable. The cubic perovskite BaCe 0.8 Pr 0.05 Cu 0.15 O 3-δ with crystallite size between 99.4 nm and 131.6 nm was obtained along with barium carbonate traces. In the powders calcined at 1000 ºC the pH increase decreases the amount of barium carbonate (17.3% to pH 3, 3.4% to pH 7 and 1.8% to pH 11), but increases the size of grains with irregular shapes.

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Section: Methodsmentioning

confidence: 89%

“…The perovskite of composition BaCe 0.8 Pr 0.05 Cu 0.15 O 3-δ was synthesized by the EDTA-citrate method 9,22,23 using the chemicals listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of the Perovskite-Type BaCe0.8Pr0.05Cu0.15O3-δ via EDTA-Citrate

Santos

Macedo

et al. 2017

Mat. Res.

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“…Concerning the synthesis of metal molybdates, sol-gel 33,34 , solvothermal 35 and precipitation methods have been widely used [36][37][38][39][40][41][42] . The complexation method combining EDTA-Citrate has stood out in recent years for synthesizingdifferent materials such as perovskites (ABO 3 ) 29,43,44 , fluorites (A 2 X 3 , A 2 B 2 X 7 ) 45,46 , ferrites (ABC 2 X 5 ) 47 , and tungstates/molybdates (AWO 4 /AMoO 4 ) [48][49][50] . In general, it is a simple synthetic method that presents easy reproducibility and short synthesis time as advantages over other methods 43,[45][46][47][48] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of NiMoO4 by the Complexation Method Combining EDTA-Citrate and its Behavior Against Biodiesel Acidity

Silva

et al. 2021

Mat. Res.

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In this paper, NiMoO 4 powder was synthesized by the complexation method combining EDTA-Citrate. The behavior of the NiMoO 4 material in the ethyl transesterification reaction was evaluated by analyzing the acidity index under specified reaction conditions. The results showed that NiMoO 4 crystallized at 800 °C with a total mass loss of 85%, presenting a monoclinic structure, free of secondary phases, high degree of crystallinity and average crystallite size of 140 nm. The particles had heterogeneous sizes and shapes, but with well-defined contours. The increase in the mass of NiMoO 4 in the reaction medium reduced the acidity index (0.8 mgKOH.g -1 with 15 wt.%). Despite the use of the minimum molar ratio (1:3), the ethyl route being less reactive and the use of the operating temperature close to the alcohol evaporation temperature, NiMoO 4 showed promising catalytic potential in the transesterification process.

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“…Dados cristalográficos do pó da perovskita BaCeO 3 obtidos através das equações de Scherrer e Williamson-Hall. mesma ordem de grandeza que os apresentados por LACORRE et al[22] e LOBATO[23] et al quando sintetizados por diferentes métodos de síntese (100 -133 nm).…”

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Estudo de obtenção da membrana cerâmica densa BaCeO3

et al. 2019

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RESUMO Nos últimos anos, pós cerâmicos à base de óxidos de estrutura do tipo perovskita ganharam atenção considerável devido às suas aplicações tecnológicas na área de membranas permeáveis de oxigênio. O óxido misto BaCeO3 apesenta-se como um material amplamente estudado em uma grande diversidade de aplicações, seja como materiais eletrolíticos em células a combustível, ou mesmo como catalisadores nas reações de catálise. Dessa forma, o presente trabalho teve como objetivo sintetizar a fase BaCeO3, pelo método de coprecipitação em meio oxalato, verificando o efeito da sinterização com diferentes aglutinantes na estabilidade térmica e densificação da membrana. A técnica de coprecipitação em meio oxalato mostrouse eficaz na obtenção da perovskita BaCeO3. As amostras obtidas durante as sínteses foram caracterizadas por difração de raios-x, observando-se a formação da fase ortorrômbica da perovskita BaCeO3. Para determinar o tamanho médio de cristalito foi utilizada a equação de Scherrer e de Williamson Hall, chegando-se a um valor próximo a de 107 nm. Conforme a literatura [1,2] e diante dos resultados apresentados definiu-se como condições favoráveis para formação de material com o menor tamanho de cristalito e maior pureza da fase formada, a amostra de pH 13 e de temperatura de calcinação de 1000 ºC. Através da microscopia eletrônica de varredura (MEV) pode-se observar a formação de cristais homogêneos. Por fim, foi possível observar que a sinterização na presença dos aglutinantes parafina e álcool polivinílico a 1300 ºC com patamar de 5 h, permitiu a obtenção de pastilhas densas com bons níveis de retração, possuindo estabilidade térmica ideal para serem utilizadas como membranas permeáveis de oxigênio e como eletrólito de células a combustível.

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Síntese do cerato de bário pelo método de complexação combinando EDTA-citrato e avaliação catalítica na oxidação do monóxido de carbono testada em reator de leito fixo

Cited by 3 publications

References 15 publications

Synthesis of the Perovskite-Type BaCe0.8Pr0.05Cu0.15O3-δ via EDTA-Citrate

Synthesis of the Perovskite-Type BaCe0.8Pr0.05Cu0.15O3-δ via EDTA-Citrate

Synthesis of NiMoO4 by the Complexation Method Combining EDTA-Citrate and its Behavior Against Biodiesel Acidity

Estudo de obtenção da membrana cerâmica densa BaCeO3

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