Synthesis of strontium and barium cerate and their reaction with carbon dioxide

Scholten, M.J. de Wild; Schoonman, J.; Miltenburg, J.C. van; Oonk, H. A. J.

doi:10.1016/0167-2738(93)90338-4

Cited by 219 publications

(120 citation statements)

References 12 publications

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“…Due to the fact that the exhaust gases contain a significant amount of CO 2 and since it was reported that pure BaCeO 3 can be decomposed in the presence of CO 2 [53,54] we became narrower under dynamic reaction conditions at lower CO 2 concentration (Fig. 11b).…”

Section: Reaction Of Baal 2 O 4 and Baceo 3 With Comentioning

confidence: 99%

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Casapu

Grunwaldt

Maciejewski

et al. 2006

Applied Catalysis B: Environmental

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The formation and stability of BaAl 2 O 4 and BaCeO 3 in Pt-Ba/Al 2 O 3 and Pt-Ba/CeO 2 based NO x storage-reduction (NSR) catalyst has been investigated using kinetic measurements, X-ray diffraction, thermal analysis and X-ray absorption spectroscopy. In as-prepared state, the Ba-component in the NSR catalysts was made up of amorphous BaO and BaCO 3 . The formation of BaAl 2 O 4 started above 850°C, whereas the formation of BaCeO 3 was already observed at 800°C and was faster than that of BaAl 2 O 4 . The stability of BaAl 2 O 4 and BaCeO 3 in various liquid and gaseous atmospheres was different. BaAl 2 O 4 was rapidly hydrated at room temperature in the presence of water and transformed to Ba(NO 3 ) 2 and γ-alumina in the presence of HNO 3 , whereas BaCeO 3 was decomposed to much lower extent under these conditions. Interestingly, BaCeO 3 was transformed to Ba(NO 3 ) 2 /CeO 2 in the presence of NO 2 /H 2 O at 300 -500 °C. Also the presence of CO 2 led to decomposition of barium cerate, which has important consequences for the catalyst ageing under NO x -storage conditions and can be exploited for regeneration of thermally aged NSR-catalysts.

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Section: Reaction Of Baal 2 O 4 and Baceo 3 With Comentioning

confidence: 99%

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Casapu

Grunwaldt

Maciejewski

et al. 2006

Applied Catalysis B: Environmental

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“…Despite the encouraging proton conductivity of these materials, there are several issues addressed related to their chemical stability, mechanical properties and difficulties in sintering of BZY. 15,17 BCY has a low chemical stability due to the reactivity with CO2 18 resulting in formation of barium carbonate, [19][20][21][22][23][24][25] while BZY is proposed to exhibit sufficient chemical stability in CO2-containing atmosphere. 12,[24][25][26][27][28][29] The reactivity with CO2 will result in degradation, which precludes applications in electrochemical devices such as fuel cells based on hydrocarbon fuels.…”

Section: -7mentioning

confidence: 99%

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

et al. 2016

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The reactivity of BaZrO3 with CO2 has been addressed as one of the major challenges with BaZrO3-based electrolytes in proton ceramic fuel cells. Here, we present a study of the effect of CO2 exposure of BaZrO3-materials at elevated temperatures. Dense BaZr1-xYxO3-δ (x = 0, 0.05, 0.1, 0.2) and BaCe0.2Zr0.7Y0.1O2.95 ceramics were prepared by conventional sintering of powder prepared by spray pyrolysis. The Vickers indentation method was used to determine the hardness and estimate the fracture toughness of pristine materials as well as the corresponding materials exposed to CO2. Formation of BaCO3 on the surface of exposed ceramics was confirmed by X-ray diffraction and electron microcopy. The reaction resulted in formation of Ba-deficient perovskite at the exposed surface. The reaction with CO2 was most pronounced at 650 ºC compared to the other temperatures applied in the study. The reactivity was also shown to depend on the Y-content and the grain size and was most pronounced for BaZr0.9Y0.1O3-δ. The reaction with CO2 was observed to have a profound effect on the fracture toughness of the ceramics, demonstrating a depression of the mechanical stability of the materials. The results are discussed with respect to the chemical and mechanical stability of BaZrO3 materials, with particular emphasis on the composition and grain size.

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“…Entretanto, os valores reportados [25] de condutividade protônica variam em mais de uma ordem de grandeza. A alta resistividade elétrica dos contornos de grão do BaZrO 3 não foi compreendida por vários anos, como conseqüência da natureza refratária do material, o que resulta em amostras com grãos pequenos e, portanto, com alta densidade de contornos de grão [24,26]. Eletrólitos sólidos de cerato de bário sinterizados mostraram ser quimicamente instáveis na presença de CO 2 , ou em atmosferas contendo SO 2 a temperaturas menores que 600 °C, e apresentam baixa resistência mecânica para aplicações práticas [27,28].…”

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“…A compreensão das propriedades do zirconato de bário foi substancialmente revisada em 1999 [26]. Neste ano, foi reportada a condutividade do zirconato de bário dopado com ítrio como ~5×10 -5 S.cm -1 a apenas 140 °C [26], e este valor foi confirmado em 2000 [24].…”

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“…Neste ano, foi reportada a condutividade do zirconato de bário dopado com ítrio como ~5×10 -5 S.cm -1 a apenas 140 °C [26], e este valor foi confirmado em 2000 [24]. Em estudos posteriores, foi notada a baixa reprodutibilidade das medidas de condutividade elétrica do zirconato de bário [40], sendo este fato relacionado com a dificuldade de obter compactos policristalinos homogêneos [25].…”

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Efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

Andrade

Muccillo

2011

Cerâmica

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Synthesis of strontium and barium cerate and their reaction with carbon dioxide

Cited by 219 publications

References 12 publications

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics

Efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

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Synthesis of strontium and barium cerate and their reaction with carbon dioxide

Cited by 219 publications

References 12 publications

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Formation and stability of barium aluminate and cerate in NOx storage-reduction catalysts

Effect of CO2 Exposure on the Chemical Stability and Mechanical Properties of BaZrO3‐Ceramics

Efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

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Effect of CO₂ Exposure on the Chemical Stability and Mechanical Properties of BaZrO₃‐Ceramics