AMnO3 (A=La, Nd, Sm) and Sm1−xSrxMnO3 perovskites as combustion catalysts: structural, redox and catalytic properties

Ciambelli, Paolo; Cimino, Stefano; Rossi, S. De; Faticanti, Marco; Lisi, L.; Minelli, G.; Pettiti, Ida; Porta, P.; Russo, G.; Turco, Maria Caterina

doi:10.1016/s0926-3373(99)00110-1

Cited by 180 publications

(97 citation statements)

References 23 publications

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“…The high hydrogen consumption with x Ca (Fe) can be explained by the higher amount of Fe 4+ ions generated to compensate the charge imbalance. 18 Since surface carbonates are related with a presence of segregated phases and the reduction of these carbonates also consumes hydrogen, the large increase in the hydrogen consumption of the x Ca (Fe) = 0.4 is a measure of the presence of highly dispersed segregated phases relative to that observed in the x Ca (Fe) = 0.2 perovskite.…”

Section: Resultsmentioning

confidence: 99%

Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Pecchi

Jiliberto

Delgado

et al. 2011

J of Chemical Tech & Biotech

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Section: Resultsmentioning

confidence: 99%

Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Pecchi

Jiliberto

Delgado

et al. 2011

J of Chemical Tech & Biotech

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“…The (La,Me)MnO 3 , (Me=Ba,Sr,Ca), solid solutions have been extensively studied (10)(11)(12), while less work has been devoted to other light RE manganite systems, such as (Nd,Ca), (13), (Sm,Sr), (14), (Eu,Sr) (15) and (Gd,Sr), (16) manganites. The scope of the present work is to study the formation of solid solution Dy 1-x Ca x MnO 3 , their crystalline features and their electrical conductivity behaviour.…”

Section: Introductionmentioning

confidence: 99%

Estructura cristalina y propiedades eléctricas de las soluciones sólidas Dy1-xCaxMnO3

Moure¹,

Gutiérrez²,

Peña³

et al. 2002

Bol. Soc. Esp. Ceram. Vidr.

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Solid solutions corresponding to the Dy 1-x Ca X MnO 3 system, x=0.0 to 0.60 have been studied. The powders were prepared by solid state reaction of the corresponding oxides and carbonates. Sintered bodies were obtained by firing between 1250 and 1450ºC. All the compositions showed single-phased perovskite-type structure with orthorhombic symmetry and Space Group Pbnm. Increase of the CaO content leads to a monotonic decrease of the orthorhombicity factor b/a with the Ca 2+ concentration up to x=0.60. All the solid solutions crystallised with the same O'-type orthorhombic perovskite structure such as pure DyMnO 3 . Electrical measurements have shown semiconducting behaviour for all the solid solutions. The room temperature conductivity increases monotonically with the CaO content. The 60/40 Ca/Dy composition showed a high value of the electrical conductivity and a correlative very low value of the activation energy. Thermally activated small polaron hopping mechanism controls the conductivity of these perovskite ceramics.Keywords: Perovskites, manganites, Crystalline structure, electrical conductivity. Estructura cristalina y propiedades eléctricas de las soluciones sólidas Dy 1-x Ca x MnO 3Se han estudiado soluciones sólidas correspondientes al sistema Dy 1-x Ca x MnO 3 , x=0.0 a 0.60. Los polvos cerámicos fueron preparados por reacción en estado sólido de los correspondientes óxidos y carbonatos. Los materiales cerámicos se obtuvieron por sinterización entre 1250º y 1450ºC. Todas las composiciones fueron monofásicas y mostraron una estructura tipo perovskita, con simetría ortorrómbica y Grupo Espacial Pbnm. El aumento del contenido en CaO llevó a una disminución monóto-na del factor de ortorrombicidad, b/a. Todas las soluciones sólidas cristalizaron con el mismo tipo de estructura perovskita ortorrómbica O', como la del compuesto puro DyMnO 3 . Las medidas eléctricas mostraron comportamiento semiconductor en todas las soluciones sólidas. La conductividad a temperatura ambiente aumenta monótonamente con el contenido de CaO. La composición 60/40 mostró un elevado valor de conductividad y un correlativo bajo valor de la energía de activación. Un mecanismo de salto térmicamente activado de pequeño polarón controla la conductividad de las perovskitas.

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“…Compared with the MIP-6, SG has a lower activity, T 10% as 448°C and T 50% as 525°C, about 40°C higher than that According to literature, the activity of La-Mn-O perovskite catalysts in oxidation reaction was found to depend on the following factors: the specific surface area, redox-capacity of the catalysts and the composition of the catalyst surface [9,23]. These catalysts have lower SSA in range of 4.4-6.5 m 2 /g.…”

Section: Catalytic Activitymentioning

confidence: 87%

“…A large number of researchers have paid attention to perovskite catalysts, noble metal and hexaaluminates. Perovskite, the general formula ABO 3 , is well known for its cheapness, activity and the thermal stability in methane combustion [7], where A is usually a rare earth element La, Sr, Ba, Nd, Sm and B is usually a transition metal Co, Mn, Cr, Fe and Ni [8][9][10][11]. La-Mn-O based perovskite has been found to be one of the most active perovskite oxide catalysts towards methane combustion [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of La-Mn-O Perovskite Catalyst by Microwave Irradiation Method and its Application to Methane Combustion

et al. 2010

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La-Mn-O perovskite catalyst was successfully prepared by microwave irradiation processing using only several minutes for heat treatment, and characterized by XRD, SEM, XPS, H 2 -TPR and O 2 -TPD. The catalyst by microwave irradiation processing with 6 min, mainly nonstoichiometric excess oxygen LaMnO 3.15 phase, shows excellent catalytic performance. Compared with the sample prepared by conventional method, it possesses relative higher surface area, the increase in Mn 4? and oxygen vacancy content and the enhancement in the mobility of lattice oxygen which play an important part in the methane combustion.

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AMnO3 (A=La, Nd, Sm) and Sm1−xSrxMnO3 perovskites as combustion catalysts: structural, redox and catalytic properties

Cited by 180 publications

References 23 publications

Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Estructura cristalina y propiedades eléctricas de las soluciones sólidas Dy<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub>

Preparation of La-Mn-O Perovskite Catalyst by Microwave Irradiation Method and its Application to Methane Combustion

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AMnO3 (A=La, Nd, Sm) and Sm1−xSrxMnO3 perovskites as combustion catalysts: structural, redox and catalytic properties

Cited by 180 publications

References 23 publications

Effect of B‐site cation on the catalytic activity of La1−xCaxBO3 (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Effect of B‐site cation on the catalytic activity of La1−xCaxBO3 (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Estructura cristalina y propiedades eléctricas de las soluciones sólidas Dy<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub>

Preparation of La-Mn-O Perovskite Catalyst by Microwave Irradiation Method and its Application to Methane Combustion

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Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion

Effect of B‐site cation on the catalytic activity of La_1−xCa_xBO₃ (B = Fe, Ni) perovskite‐type oxides for toluene combustion