Keywords: Hydrogen and syngas, biofuels reforming, structured catalysts, microchannel and foam ... more Keywords: Hydrogen and syngas, biofuels reforming, structured catalysts, microchannel and foam substrates, Ru-Ni alloy nanoparticles, perovskite-like and fluorite-like oxide supports, catalytic performance, coking stability. Abstract Catalysts for biofuels reforming based on two types of nanocomposite active components (Ni+Ru/La0.8Pr0.2Mn0.2Cr0.8O3/Y0.08Zr0.92O2-, Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2) supported on microchannel substrates (Ni-Al alloy foam plates, Fechraloy plates protected by a thin corundum layer) were developed. Applied procedures for the active components loading on substrates provide thermochemical stability of supported layers of active components in tough operation conditions not affecting their reactivity/catalytic activity. Effects of the nature of nanocomposite active component, type of fuel (ethanol, ethyl acetate, acetone and glycerol), feed composition and contact time on the yield of syngas/byproducts and performance stability are considered and compared with results of calculations of the equilibrium composition of reaction mixtures. For nanocomposite active components with a high oxygen mobility and reactivity, reforming of such typical fuel as ethanol is described by the step-wise red-ox mechanism. Preliminary results of the mathematical modeling of the ethanol steam reforming on a stack of microchannel Fechraloy plates loaded with Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2 active component revealed that this process can be satisfactorily described by the isothermal model without any impact of the heat/mass transfer.
For nanocrystalline ceria–zirconia samples doped with rare-earth (Gd, Pr, La) cations prepared vi... more For nanocrystalline ceria–zirconia samples doped with rare-earth (Gd, Pr, La) cations prepared via modified Pechini route and promoted by Pt supported by wet impregnation, parameters characterizing their oxygen mobility and reactivity were estimated from results of oxygen isotope exchange experiments in both isothermal and temperature-programmed modes using different procedures. Observed trends in variation of oxygen exchange parameters with the type
LSM/ScCeSZ nanocomposite was prepared via ultrasonic dispersion of the mixture of perovskite and ... more LSM/ScCeSZ nanocomposite was prepared via ultrasonic dispersion of the mixture of perovskite and fluorite powders in isopropanol in 1:1 ratio with addition of polyvinyl butyral. Studies of the real structure and surface property evolution at sintering under air up to 1100°C revealed some redistribution of elements between the phases without new phase formation. Sizes of both phase domains remain in
LnFe0.7Ni0.3O3−δ (Ln=La, Pr, Sm) perovskites synthesized via Pechini method have been studied as ... more LnFe0.7Ni0.3O3−δ (Ln=La, Pr, Sm) perovskites synthesized via Pechini method have been studied as catalysts of methane dry reforming (MDR). Effects of pretreatment and type of Ln cation on the structural and redox properties of perovskites and their catalytic performance have been elucidated. The most active catalysts are obtained by keeping perovskites in the reaction feed at high temperatures due to
ABSTRACT An inverted open-cell foam model based on hexagonal close packing symmetry is proposed f... more ABSTRACT An inverted open-cell foam model based on hexagonal close packing symmetry is proposed for open-cell foams with different configuration of struts. The novel model predicts the properties of the broad spectrum of open-cell ceramic and metallic structures. According to the proposed model, the specific surface and hydraulic permeability can be derived from experimentally measurable parameters such as porosity and cell diameter. The calculated parameters are in good correlation with the experimental data even without introducing additional empirical coefficients.
A series of iron- and/or aluminium-doped apatite-type lanthanum silicates (ATLS) La9.83Si6‐x‐yAlx... more A series of iron- and/or aluminium-doped apatite-type lanthanum silicates (ATLS) La9.83Si6‐x‐yAlxFeyO26±δ (x=0, 0.25, 0.75, and 1.5, y=0, 0.25, 0.75, and 1.5) were synthesized using the mechanochemical activation (MA), solid state reaction (SSR), Pechini (Pe) and sol–gel (SG) methods. The total conductivity of the prepared materials was measured under air in the temperature range 600–850°C using 4-probe AC impedance spectroscopy. Its
Keywords: Hydrogen and syngas, biofuels reforming, structured catalysts, microchannel and foam ... more Keywords: Hydrogen and syngas, biofuels reforming, structured catalysts, microchannel and foam substrates, Ru-Ni alloy nanoparticles, perovskite-like and fluorite-like oxide supports, catalytic performance, coking stability. Abstract Catalysts for biofuels reforming based on two types of nanocomposite active components (Ni+Ru/La0.8Pr0.2Mn0.2Cr0.8O3/Y0.08Zr0.92O2-, Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2) supported on microchannel substrates (Ni-Al alloy foam plates, Fechraloy plates protected by a thin corundum layer) were developed. Applied procedures for the active components loading on substrates provide thermochemical stability of supported layers of active components in tough operation conditions not affecting their reactivity/catalytic activity. Effects of the nature of nanocomposite active component, type of fuel (ethanol, ethyl acetate, acetone and glycerol), feed composition and contact time on the yield of syngas/byproducts and performance stability are considered and compared with results of calculations of the equilibrium composition of reaction mixtures. For nanocomposite active components with a high oxygen mobility and reactivity, reforming of such typical fuel as ethanol is described by the step-wise red-ox mechanism. Preliminary results of the mathematical modeling of the ethanol steam reforming on a stack of microchannel Fechraloy plates loaded with Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2 active component revealed that this process can be satisfactorily described by the isothermal model without any impact of the heat/mass transfer.
For nanocrystalline ceria–zirconia samples doped with rare-earth (Gd, Pr, La) cations prepared vi... more For nanocrystalline ceria–zirconia samples doped with rare-earth (Gd, Pr, La) cations prepared via modified Pechini route and promoted by Pt supported by wet impregnation, parameters characterizing their oxygen mobility and reactivity were estimated from results of oxygen isotope exchange experiments in both isothermal and temperature-programmed modes using different procedures. Observed trends in variation of oxygen exchange parameters with the type
LSM/ScCeSZ nanocomposite was prepared via ultrasonic dispersion of the mixture of perovskite and ... more LSM/ScCeSZ nanocomposite was prepared via ultrasonic dispersion of the mixture of perovskite and fluorite powders in isopropanol in 1:1 ratio with addition of polyvinyl butyral. Studies of the real structure and surface property evolution at sintering under air up to 1100°C revealed some redistribution of elements between the phases without new phase formation. Sizes of both phase domains remain in
LnFe0.7Ni0.3O3−δ (Ln=La, Pr, Sm) perovskites synthesized via Pechini method have been studied as ... more LnFe0.7Ni0.3O3−δ (Ln=La, Pr, Sm) perovskites synthesized via Pechini method have been studied as catalysts of methane dry reforming (MDR). Effects of pretreatment and type of Ln cation on the structural and redox properties of perovskites and their catalytic performance have been elucidated. The most active catalysts are obtained by keeping perovskites in the reaction feed at high temperatures due to
ABSTRACT An inverted open-cell foam model based on hexagonal close packing symmetry is proposed f... more ABSTRACT An inverted open-cell foam model based on hexagonal close packing symmetry is proposed for open-cell foams with different configuration of struts. The novel model predicts the properties of the broad spectrum of open-cell ceramic and metallic structures. According to the proposed model, the specific surface and hydraulic permeability can be derived from experimentally measurable parameters such as porosity and cell diameter. The calculated parameters are in good correlation with the experimental data even without introducing additional empirical coefficients.
A series of iron- and/or aluminium-doped apatite-type lanthanum silicates (ATLS) La9.83Si6‐x‐yAlx... more A series of iron- and/or aluminium-doped apatite-type lanthanum silicates (ATLS) La9.83Si6‐x‐yAlxFeyO26±δ (x=0, 0.25, 0.75, and 1.5, y=0, 0.25, 0.75, and 1.5) were synthesized using the mechanochemical activation (MA), solid state reaction (SSR), Pechini (Pe) and sol–gel (SG) methods. The total conductivity of the prepared materials was measured under air in the temperature range 600–850°C using 4-probe AC impedance spectroscopy. Its
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Papers by V. Sadykov
Abstract
Catalysts for biofuels reforming based on two types of nanocomposite active components (Ni+Ru/La0.8Pr0.2Mn0.2Cr0.8O3/Y0.08Zr0.92O2-, Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2) supported on microchannel substrates (Ni-Al alloy foam plates, Fechraloy plates protected by a thin corundum layer) were developed. Applied procedures for the active components loading on substrates provide thermochemical stability of supported layers of active components in tough operation conditions not affecting their reactivity/catalytic activity. Effects of the nature of nanocomposite active component, type of fuel (ethanol, ethyl acetate, acetone and glycerol), feed composition and contact time on the yield of syngas/byproducts and performance stability are considered and compared with results of calculations of the equilibrium composition of reaction mixtures. For nanocomposite active components with a high oxygen mobility and reactivity, reforming of such typical fuel as ethanol is described by the step-wise red-ox mechanism. Preliminary results of the mathematical modeling of the ethanol steam reforming on a stack of microchannel Fechraloy plates loaded with Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2 active component revealed that this process can be satisfactorily described by the isothermal model without any impact of the heat/mass transfer.
Abstract
Catalysts for biofuels reforming based on two types of nanocomposite active components (Ni+Ru/La0.8Pr0.2Mn0.2Cr0.8O3/Y0.08Zr0.92O2-, Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2) supported on microchannel substrates (Ni-Al alloy foam plates, Fechraloy plates protected by a thin corundum layer) were developed. Applied procedures for the active components loading on substrates provide thermochemical stability of supported layers of active components in tough operation conditions not affecting their reactivity/catalytic activity. Effects of the nature of nanocomposite active component, type of fuel (ethanol, ethyl acetate, acetone and glycerol), feed composition and contact time on the yield of syngas/byproducts and performance stability are considered and compared with results of calculations of the equilibrium composition of reaction mixtures. For nanocomposite active components with a high oxygen mobility and reactivity, reforming of such typical fuel as ethanol is described by the step-wise red-ox mechanism. Preliminary results of the mathematical modeling of the ethanol steam reforming on a stack of microchannel Fechraloy plates loaded with Ni+Ru/Sm0.15Pr0.15Ce0.35Zr0.35O2 active component revealed that this process can be satisfactorily described by the isothermal model without any impact of the heat/mass transfer.