Phase transformation during the sintering of γ-alumina and the simulated Ni-laden waste sludge

Wang, Yanchun; Shih, Kaimin; Jiang, Xiaobin

doi:10.1016/j.ceramint.2011.10.015

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…The results of lattice parameters of both phases and their weight fraction are shown in Figure (A–E). The refinements present correct reliability factors, R p =4.26–5.12 %, R wp =5.34–6.67 % and “goodness of fit (GOF)” or χ 2 =1.28–1.93 (value between 1.0 and 2.9 is generally considered satisfactory), confirmed by the graphical analysis of each refinement. Very slight evolution of the lattice parameters can be evidenced along with the reduction duration with an apparent a decrease while c parameter increases for the LSM n=1 up to t r =24 h. The phenomenon seems to stabilize for larger reduction times.…”

Section: Resultsmentioning

confidence: 99%

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

et al. 2019

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An original way to perform the exsolution of Ni nanoparticles on a ceramic support was explored for the development of methane steam reforming catalyst in SOFC anode conditions. The n=2 Ruddlesden‐Popper (RP) phase La1.5Sr1.5Mn1.5Ni0.5O7±δ has been synthesized by the Pechini method and subsequently reduced with an H2‐N2 mixture at different temperatures and reducing times to induce the formation of two phases: LaSrMnO4 (n=1 RP) decorated with metallic Ni nanoparticles. Preliminary measurements of catalytic behavior for the steam reforming have been carried out in a reduction‐reaction process with a mixture of 82 mol %CH4, 18 mol %N2 and low steam to carbon ratio (S/C=0.15). The catalyst exhibits a selectivity for CO production (0.97), 14.60 mol % CH4 conversion and around 24.19 mol % H2 production. Such catalytic behavior was maintained for more than 4 h, with a constant rate of hydrogen production and CH4 conversion rate.

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Section: Resultsmentioning

confidence: 99%

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

et al. 2019

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“…The refined lattice parameters of both phases (LSMO n = 1 and Ni) are presented in Figure 4 (A-C) with reasonable reliability factors of Rp = 3.97-4.18 %, Rwp = 5.57-5.61 % and "goodness of fit (GOF)" or χ 2 = 1.56-1.68 (χ 2 values between 1.0 and 2.9 are generally considered satisfactory [52] ) also confirmed by the graphical analysis of each refinement. By comparison with the values obtained from the analysis of the oxidized phase LSMO n = 1, an expansion of the c-parameter and the unit-cell volume is evidenced, in agreement with Sandoval et al [45] Such effect is related to the reduction of Mn 4 + to Mn 3 + and the generation of oxygen vacancies (δ) in the oxide structure.…”

Section: Catalysts Studymentioning

confidence: 92%

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

et al. 2020

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The catalytic behavior of the new Ni exsolved Ruddlesden‐Popper (RP) manganite (La1.5Sr1.5Mn1.5Ni0.5O7) for the reforming reaction was studied. The material was synthesized by the Pechini method and reduced to induce the formation of two phases: n=1 RP structure LaSrMnO4 decorated with Ni nanoparticles. Ni impregnation on (La,Sr)2MnO4 ceramic support of similar composition was also prepared for comparison. The catalytic measurements were carried out in a reduction‐reaction process with low steam to carbon content (S/C=0.15) at 700, 800 and 850 °C. The exsolved material exhibits a better performance than the impregnated for the methane steam reforming reaction, especially at 850 °C with higher conversion and H2 production rate. However, in light alkane gas mixtures (CH4−C2H6 and CH4−C3H8), the behavior is affected due to the competition between reactions and low available metallic active sites, without affecting the H2 production. The exceptional overall results considering this new material as a promising anode material in a SOFC fed with Colombian natural gas.

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“…The intensity of XRD peaks of the sample reflects that the formed nanoparticles are crystalline and broad diffraction peaks indicate very small size crystallite. For the 20 % SA incorporated in mesoporous alumina also showed the characteristic peaks for alumina at 2θ=47 and 67° only . Again, no diffraction peak assigned to crystalline NaAlO 2 was observed, suggesting that NaAlO 2 particles were well distributed in the materials and excluding the formation of larger crystals.…”

Section: Resultsmentioning

confidence: 91%

NaAlO₂‐Promoted Mesoporous Catalysts for Room temperature Knoevenagel Condensation Reaction

2020

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Mesoporous solid base catalysts are essential candidates for green and sustainable catalytic processes. In this work, novel mesoporous solid base catalysts was synthesized by promoting mesoporous supports with sodium aluminate (NaAlO2). The prepared catalysts are characterized using a wide variety of molecular and solid‐state techniques to determine their structural and textural properties. The catalysts texture was strongly affected by the promotion of sodium aluminate. The nature of the support and the sodium aluminate loading are shown to play a crucial role on the total basicity. In turn, these NaAlO2‐containing mesoporous materials showed high catalytic activity for Knoevenagel condensation under solvent free reaction conditions. The catalysts are truly heterogeneous without leaching any active sites and also showed good reusability.

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Phase transformation during the sintering of γ-alumina and the simulated Ni-laden waste sludge

Cited by 16 publications

References 18 publications

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

NaAlO₂‐Promoted Mesoporous Catalysts for Room temperature Knoevenagel Condensation Reaction

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Phase transformation during the sintering of γ-alumina and the simulated Ni-laden waste sludge

Cited by 16 publications

References 18 publications

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Nickel Exsolution‐Driven Phase Transformation from an n=2 to an n=1 Ruddlesden‐Popper Manganite for Methane Steam Reforming Reaction in SOFC Conditions

Catalytic Steam Reforming of Natural Gas over a New Ni Exsolved Ruddlesden‐Popper Manganite in SOFC Anode Conditions

NaAlO2‐Promoted Mesoporous Catalysts for Room temperature Knoevenagel Condensation Reaction

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NaAlO₂‐Promoted Mesoporous Catalysts for Room temperature Knoevenagel Condensation Reaction