Effect of gadolinium on the catalytic properties of iron oxides for WGSR

Silva, Caio Luis Santos; Marchetti, Sérgio Gustavo; Faro, Arnaldo C.; Silva, Tatiana de Freitas; Assaf, José Mansur; Rangel, María do Carmo

doi:10.1016/j.cattod.2013.02.025

Cited by 35 publications

(16 citation statements)

References 39 publications

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“…Further annealing at 800 °C decreased the Fe 2+ components for both samples; however, the partially oxidized Fe remained with a small portion of Fe 2+ components as previously reported . In addition, we observed a shift of ∼0.25 eV toward higher binding energy of the metallic components in the presence of Gd (Figure b), which may indicate the formation of an Fe–Gd alloy or Fe–Gd oxide, as previously reported with a catalyst for the water gas shift reaction …”

Section: Resultssupporting

confidence: 87%

Gd-Enhanced Growth of Multi-Millimeter-Tall Forests of Single-Wall Carbon Nanotubes

et al. 2019

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Multi-millimeter-tall vertically aligned single-wall carbon nanotube (VA-SWCNT) forests were grown using Fe/Gd/Al 2 O x catalyst with high initial growth rate of ∼2 μm s −1 and long catalyst lifetime of ∼70 min at 800 °C. The addition of Gd with a nominal thickness of 0.3 nm drastically prolonged the catalyst lifetime. The analysis of the VA-SWCNT forests by a transmission electron microscope showed that the average diameter of the SWCNTs grown with Gd is constant from the top to the bottom of the forests, while it monotonically increased without Gd. This indicated that Gd suppresses the structure change of the Fe nanoparticles in the lateral direction during the CNT growth. By X-ray photoelectron spectroscopy, it was found that the longer catalyst lifetime with Gd stems from the suppression of the interaction between Fe and C resulting in the smaller structure change of the Fe nanoparticles.

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Section: Resultssupporting

confidence: 87%

Gd-Enhanced Growth of Multi-Millimeter-Tall Forests of Single-Wall Carbon Nanotubes

et al. 2019

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“…Gadolinium (Gd), a lanthanide group element, was selected as a dopant to evaluate the structural stability, as it has potential interest in areas such as electrocatalysis , and as a dopant for rechargeable battery applications in various host structures. − To the best of our knowledge, in this work, Gd(III) is described as a new member of the class of orthorhombic phase and the theoretical insights provide an optimized amount of dopant (Gd 0.05 B i 1.95 MoO 6 ) that possesses a stable crystal structure. The fact that both Bi and Gd are electrochemically active in negative potential and have similar ionic radii (0.103 and 0.105 for Bi 3+ and Gd 3+ , respectively) makes them suitable candidates as a dopant .…”

Section: Introductionmentioning

confidence: 99%

Highly Energetic and Stable Gadolinium/Bismuth Molybdate with a Fast Reactive Species, Redox Mechanism of Aqueous Electrolyte

Sharma

Minakshi

Singh

et al. 2020

ACS Appl. Energy Mater.

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The electronic properties and stability of gadolinium-doped bismuth molybdate composites are critical characteristics that determine the efficiency of storing energy reversibly as a propitious electrode for energy storage applications. Gd-doped Bi2MoO6 is presented, which is based on the orthorhombic phase host Bi2MoO6 lattice, where variable amounts of Gd dopant are substituted in the Bi site, resulting in significantly improved energy storage performance. The doping effects with the aim of better understanding the electronic structure of Gd-doped Bi2MoO6 and fine-tuning the properties of energetically favorable material that possesses the most stable crystal structure are reported. The measured X-ray photoelectron spectra of Gd (4d) confirm the presence of the Gd(III) state. The enhanced stability of Gd0.05 Bi 1.95MoO6 has been attributed to the ability to distribute electron density evenly. In a three-electrode configuration, using aqueous NaOH electrolyte, the Gd0.05Bi 1.95MoO6 electrode demonstrated a high specific areal capacitance of 2.15 F cm–2 (the equivalent of 191.5 mAh g–1). The results reported herein are important as they provide an insight into the factors influencing highly energetic and fast reactive species in the Gd(III) composites, which could be a potential anode material for energy storage applications. The optimized anode material is coupled with Ni–Co–Cu ternary oxide cathode and evaluated as a device. The asymmetric supercapattery showed 153 mAh g–1 at a current density of 4 mA cm–2 with an excellent retention of 89% after 1000 long cycles.

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“…The TG curves for the catalyst precursors (before calcination) are displayed in Figure 1. For all cases, there was a weight loss in two stages: the first at around 200°C, related to loss of volatiles adsorbed on the solids; the second stage at higher temperatures, in the range of 200-450°C, can be assigned to the decomposition of iron hydroxide to produce hematite and/or maghemite [43,44]. It can be noted that the kind of the support affected hematite formation, probably due to different interactions of the iron oxide precursor with the support.…”

Section: Thermogravimetrymentioning

confidence: 97%

Effect of Dopants on the Properties of Zirconia‐Supported Iron Catalysts for Ethylbenzene Dehydrogenation with Carbon Dioxide

Rangel¹,

Lima²,

SantanaBorges³

et al. 2016

Greenhouse Gases - Selected Case Studies

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Due to the harmful effects of carbon dioxide to the environment, a lot of work has been carried out aiming to find new applications, which can decrease the emissions or to capture and use it. An attractive application for carbon dioxide is the synthesis of chemicals, especially for producing styrene by ethylbenzene dehydrogenation, in which it increases the catalyst activity and selectivity. In order to find efficient catalysts for the reaction, the effect of cerium, chromium, aluminum, and lanthanum on the properties of zirconia-supported iron oxides was studied in this work. The modified supports were prepared by precipitation and impregnated with iron nitrate. The obtained catalysts were characterized by thermogravimetry, Fourier transform infrared spectroscopy, Xray diffraction, specific surface area measurement, and temperature-programmed reduction. The catalysts showed different textural and catalytic properties, which were associated to the different phases in the solids, such as monoclinic or tetragonal zirconia, hematite, maghemite, cubic ceria, monoclinic or hexagonal lantana, and rhombohedral chromia, the active phases in ethylbenzene dehydrogenation. The most promising dopant was cerium, which produces the most active catalyst at the lowest temperature, probably due to its ability of providing lattice oxygen, which activates carbon dioxide and increases the reaction rate.

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Effect of gadolinium on the catalytic properties of iron oxides for WGSR

Cited by 35 publications

References 39 publications

Gd-Enhanced Growth of Multi-Millimeter-Tall Forests of Single-Wall Carbon Nanotubes

Gd-Enhanced Growth of Multi-Millimeter-Tall Forests of Single-Wall Carbon Nanotubes

Highly Energetic and Stable Gadolinium/Bismuth Molybdate with a Fast Reactive Species, Redox Mechanism of Aqueous Electrolyte

Effect of Dopants on the Properties of Zirconia‐Supported Iron Catalysts for Ethylbenzene Dehydrogenation with Carbon Dioxide

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