Oxygen permeation and oxidative coupling of methane in membrane reactor: A new facile synthesis method for selective perovskite catalyst

Taheri, Zahra; Nazari, Kamran; Safekordi, Ali Akbar; Seyed-Matin, Naser; Ahmadi, Reza; Esmaeili, Nazila; Tofigh, Atefe

doi:10.1016/j.molcata.2008.01.043

Cited by 15 publications

(12 citation statements)

References 55 publications

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“…The complexation method was performed using two chelating agents: EDTNAD and EDTA. In the case of EDTNAD, the following modified method was applied according to the method described for La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d (abbreviated as LSCF(6482)) perovskite [40]: The stoichiometric amounts of each salt including Sr(NO 3 (82)) perovskites as well as LSCF (6482) were also prepared using EDTA as the chelating agent in a similar procedure reported before [2]. SCF(82), LSCF(8264) and LSCF(6482) perovskites were also synthesized by the co-precipitation method [29].…”

Section: Methodsmentioning

confidence: 99%

“…For these measurements, the reported membrane reactor set up [40] was used at 1,073-1,223 K under atmospheric pressure.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous work, a La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d perovskite was successfully prepared in a single-step process applying a new chelating agent, EDTNAD [40] (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of oxygen permeation through some perovskite membranes synthesized with EDTNAD

Taheri¹,

Nazari²,

Seyed-Matin³

et al. 2010

Reac Kinet Mech Cat

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Three dense membranes of types SrCo 0.8 Fe 0.2 O 3-d (SCF(82)), La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d (LSCF(6482)) and La 0.8 Sr 0.2 Co 0.6 Fe 0.4 O 3-d (LSCF (8264)) perovskites were prepared by complexation applying a chelating agent, ethylene diamine N,N,N 0 ,N 0 -tetra-N-acetyl-diamine (EDTNAD). The oxygen permeation flux through the perovskite membranes was measured as a function of temperature within 1,073-1,223 K as well as the oxygen partial pressure of 0.1-1.0 bar. The oxygen permeation fluxes for the membranes, SCF(82), LSCF(6482), LSCF(8264) with the thickness of 0.85 mm were observed as 9.2 9 10 -7 (mol/cm 2 s), 1.7 9 10 -7 (mol/cm 2 s), and 1.0 9 10 -7 (mol/cm 2 s) in these cases at 1,153 K. The results indicated the oxygen permeation process was mainly controlled by the oxygen bulk diffusion through these membranes.

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Section: Methodsmentioning

confidence: 99%

“…For these measurements, the reported membrane reactor set up [40] was used at 1,073-1,223 K under atmospheric pressure.…”

Section: Methodsmentioning

confidence: 99%

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Comparison of oxygen permeation through some perovskite membranes synthesized with EDTNAD

Taheri¹,

Nazari²,

Seyed-Matin³

et al. 2010

Reac Kinet Mech Cat

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“…Guaiacol (2 -methoxyphenol), CaCl 2 and Na 2 HPO 4 • 2 H 2 O were obtained from Merck. N,N,N',N'-Tetrakis[(hydrazinylcarbonyl)methyl]ethylenediamine (EDTNAD, abbreviation of ethylene diamine tetra N-acetyl diamine [16]) was prepared as described in [14]. Phosphate buffer and Tris • HCl solns.…”

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confidence: 99%

Binding of Divalent Metal Ions to Calcium‐Free Peroxidase: Thermodynamic and Kinetic Studies

Nazari

Kelay

Mahmoudi

et al. 2012

Chemistry & Biodiversity

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Thermodynamics of binding of divalent metal ions including Ca(2+), Mg(2+), Ba(2+), and Cd(2+) to Ca-free horseradish peroxidase (HRP) enzyme was investigated using UV/VIS spectrophotometry and molecular-mechanic (MM) calculations. According to the obtained binding and thermodynamic parameters, trend of the relative binding affinities of these divalent metal cations was found to be: Ca(2+) > Cd(2+) > Mg(2+) > Ba(2+). Binding analysis based on Scatchard and Hill models showed positive cooperativity effect between the two distal and proximal binding sites. Furthermore, kinetics of binding and reconstitution process was examined (using relaxation-time method) for binding of Ca(2+) (as the typical metal ion) to Ca-free HRP, which was found a second-order type having a two-step mechanism involving fast formation of Ca-free HRP/1 Ca(2+) as the kinetic intermediate in step 1. Finally, by means of MM calculations, the comparative stability energies were evaluated for binding of M(2+) metal cations to Ca-free HRP. Based on MM calculations, preferential binding of Ca(2+) ion was occurred on distal and proximal binding sites of Ca-free HRP associated with higher stability energies (E(total)). Indeed, among the divalent metal ions, Ca(2+) with the highest binding affinity (maximum value of K(bin) and minimum value of ΔG(bin)(0)), maximum value of exothermic binding enthalpy, and stability energies stabilizes the HRP structure along with an optimized catalytic activity.

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“…Com relação ao grande interesse pela estrutura pseudo-perovskita do material (La 1-x Sr x )(Co 1-y Fe y )O 3-δ , deve-se, principalmente, à sua propriedade mista de condutividade, iônica e eletrônica. Dentre as aplicações, destaca-se como: material catódico das ITSOFCs, membrana de separação de moléculas de oxigênio (50; 51) , como catalisador para reações de combustão de hidrocarbonetos e de redução de peróxido de hidrogênio em soluções alcalinas (52,53) . (17) .…”

Section: Células a Combustível De óXido Sólidounclassified

Síntese, processamento e caracterização de cátodo para aplicação em células a combustível de óxido sólido de temperatura intermediária

Vargas¹

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Tese apresentada como parte dos requisitos para obtenção do Grau de Doutor em Ciências na Área de Tecnologia Nuclear -Materiais Orientadora: Dra. Emília Satoshi Miyamaru Seo SÃO PAULO 2012 Dedico este trabalho ao meu pai Francisco Vargas Maldonado Filho, à minha mãe Lizete Azevedo e ao meu irmão Renato Azevedo Vargas, por tudo que significam e por todos os valores que me ensinaram. Dedico também à minha noiva Giovanna Toschi Bambicini, pelo seu amor, carinho e compreensão.

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Oxygen permeation and oxidative coupling of methane in membrane reactor: A new facile synthesis method for selective perovskite catalyst

Cited by 15 publications

References 55 publications

Comparison of oxygen permeation through some perovskite membranes synthesized with EDTNAD

Comparison of oxygen permeation through some perovskite membranes synthesized with EDTNAD

Binding of Divalent Metal Ions to Calcium‐Free Peroxidase: Thermodynamic and Kinetic Studies

Síntese, processamento e caracterização de cátodo para aplicação em células a combustível de óxido sólido de temperatura intermediária

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