First-principles kinetics study of carbon monoxide promoted Ostwald ripening of Au particles on FeO/Pt(111)

Hu, Sulei; Ouyang, Runhai; Li, Wei‐Xue

doi:10.1016/j.jechem.2018.03.023

Cited by 13 publications

(22 citation statements)

References 87 publications

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“…This means the solid solutions formed into the reaction medium, which described the growth mechanism of inhomogeneous or dissimilar structure over time. The process begins by phase precipitation of CeO 2 solid with a well-defined spherical shape; the energetic factors will move towards forming better precipitates to develop through attaching minor CeO 2 precipitates (sphere) on the bigger particle surface [26]. Thermodynamic factors could also be accountable for the amount of this effect where smaller CeO 2 sphere are stable than bigger particles (sphere with bigger particles) and reverse relative internal pressure to radius of the particle [27].…”

Section: Characterization Of Ceomentioning

confidence: 99%

Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance

et al. 2021

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In recent years, direct synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO2) has received considerable attention due to green and sustainable technology. Here, we report a production of DMC from major greenhouse gases and CO2 using various morphologies of cerium oxide (CeO2). Time-dependent synthesis of CeO2, with controlled morphology having various shapes including sphere, nanorods and spindle shape, along with its formation mechanism is proposed. The experimental results indicate the morphology of CeO2 was mostly dependent on the reaction time where crystal growth occurred through Ostwald ripening. The morphology, size and shape of CeO2 were observed using transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM).The crystallographic analysis using X-ray diffraction (XRD) shows cubic fluorite phase of CeO2 with crystallite size ~72.0 nm using the Debye–Scherrer equation. The nitrogen adsorption desorption technique suggested the formation of the highly mesoporous framework of CeO2 and the excellent surface area around 104.5 m2/g obtained for CeO2 spindles by Brunauer–Emmett–Teller (BET) method. The DMC synthesis reactions were studied over CeO2 catalyst with different morphologies. The results of catalytic reactions specify that the morphology of catalyst plays an important role in their catalytic performances, where spindle shape CeO2 was the most active catalyst producing of up to13.04 mmol of DMC. Furthermore, various dehydrating agents were used to improve the DMC production at optimized reaction parameters. The overall results reveal that the higher surface area and spindle shape of CeO2 makes it a useful, reusable catalyst for one-pot DMC synthesis.

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Section: Characterization Of Ceomentioning

confidence: 99%

Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance

et al. 2021

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“…[16,17] To describe the overall behavior of the ripeningr esistance and quantify their relative contributions, it is important to describe all of them consistentlyi no ne framework and corresponding work is ongoing. [16,17] To describe the overall behavior of the ripeningr esistance and quantify their relative contributions, it is important to describe all of them consistentlyi no ne framework and corresponding work is ongoing.…”

Section: Half-lifetime and Onset Temperature Of Ripeningmentioning

confidence: 99%

“…We note that the presentw ork focuseso nt he influence of PSD on ripening kinetics only.I na ddition, the metal-support interaction and metal-reactant interaction can affect significantly the corresponding kinetics, as shown in our recent works. [16,17] To describe the overall behavior of the ripeningr esistance and quantify their relative contributions, it is important to describe all of them consistentlyi no ne framework and corresponding work is ongoing.…”

Section: Half-lifetime and Onset Temperature Of Ripeningmentioning

confidence: 99%

“…[16,17] Herein, we present ad etail evolution of dispersion, average size, and particle number for Ostwaldr ipening of supported particles under both isothermal and thermal conditions, from which corresponding half-lifetime and onset temperature were extracted to quantify the lifetime and thermal stability. [16,17] Herein, we present ad etail evolution of dispersion, average size, and particle number for Ostwaldr ipening of supported particles under both isothermal and thermal conditions, from which corresponding half-lifetime and onset temperature were extracted to quantify the lifetime and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, the influence of size and monodispersity on the ripeningk inetics of supported particles was addressed through kinetic simulation, whereas the influence of metal-support interaction and metal-reactant interaction on the ripening kinetics of supported particles was represented in our recent works. [16,17] Herein, we present ad etail evolution of dispersion, average size, and particle number for Ostwaldr ipening of supported particles under both isothermal and thermal conditions, from which corresponding half-lifetime and onset temperature were extracted to quantify the lifetime and thermal stability. Accordingly,t he phase-diagrams of half-lifetime and onset temperature overawide range of size and monodispersity are constructed fort he first time.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Particle Size Distribution on Lifetime and Thermal Stability of Ostwald Ripening of Supported Particles

2018

ChemCatChem

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Stability of dispersed particles on their supports is one of the central topics in heterogeneous catalysis and quantifying the influence of the particle size distribution on lifetime and thermal stability is highly valuable for rational design of efficient nanocatalysts. We report here a theoretical study of Ostwald ripening of supported particles, in particular, the kinetic evolution of particle number, average size, and dispersion with respect to time and thermal temperature in a wide range of size and monodispersity. Phase diagrams of half‐lifetime and onset temperature of ripening as functions of size and monodispersity were constructed. If decreasing the average particle size, though there is a modest gain in the dispersion, the stability declines dramatically; specifically, the half‐lifetime of ripening decreases exponentially and the corresponding onset temperature decreases by hundreds of Kelvin. Decline in stability owing to the decrease in size could, however, be systematically compensated by increasing the monodispersity of the size distribution. We find that the supported particles with the same half‐life time and onset temperature could originate from different particle size distributions, whereas the particle size distribution with the same apparent dispersion could have very different onset temperature and half‐lifetime. The result highlights the importance of both size and monodispersity in particle size distribution to the ripening resistance of supported particles, and the methodology developed for simulating ripening kinetics could be used to accelerate the aging protocols.

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Sinter‐Resistant Nickel Catalyst for Lignin Hydrogenolysis Achieved by Liquid Phase Atomic Layer Deposition of Alumina

Talebkeikhah

Sun

Luterbacher

2023

Advanced Energy Materials

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exploit due to its tendency to irreversibly degrade during the initial biomass fractionation. [1,2] This degradation involves lignin condensation and the formation of highly stable interunit CC linkages, that once formed, make selectively breaking down lignin into monoaromatic compounds difficult. Lignin from conventional biorefineries and paper making processes is especially recalcitrant to upgrading.Recently, so-called lignin first strategies have emerged, which actively seek to prevent lignin degradation. One notable strategy called reductive catalytic fractionation (RCF), directly upgrades lignin during biomass fractionation by putting biomass or biomass extracts into contact with a reductant and a catalyst. [1,[3][4][5] This process leads to the reduction and upgrading of reactive intermediates into stable monophenolics. [1,6] In this context, different types of catalysts like solid acids, [7] transition metal carbides, [8] metal sulfides, [9] porous metal oxides, [10] metal organic frameworks, [11] mono and bimetallic catalysts, [12] carbon based and other catalysts have been examined for lignin or lignin model compound hydrogenolysis. [13][14][15][16] Many studies have featured carbonbased catalysts because they generally feature better activity and stability compared to common metal oxide supported catalysts, that include those based on like alumina, silica, titania and aluminosilicates. [17][18][19] An important challenge to scale all these processes is to achieve continuous and stable operation. Although Pd, Ru, and Ni on activated carbon (AC) displayed high yield in lignin hydrogenolysis [17,20] leaching, sintering, and surface poisoning are still key factors in limiting catalyst stability. For instance, Anderson et al. explored semi-continuous lignin upgrading by using flowthrough reactors that would rapidly send whole biomass extracts over supported metal catalysts in the presence of hydrogen. They observed severe Ni sintering of 50% increase in average diameter and 30% of leaching after processing 4 g of poplar wood over 12 h in their flow through reactor containing a single-bed of 15 wt% Ni/AC with a switchable biomass bed in upstream. [21] Other researchers have observed similar sintering. In batch hydrogenolysis, Park et al used 0.1 wt% Pd on N-doped carbon and core-shell Ni-alumina on activated carbon with 3 g of birch wood for 3 cycles. Although loss of activity Lignin hydrogenolysis is a key step in the sustainable production of renewable bio-based chemicals and fuels. Heterogeneous metal catalysts have led to high yields but they rapidly deactivate, notably due to nanoparticle sintering and carbonaceous deposit formation. While these deposits can be removed by regeneration, sintering is irreversible and a significant barrier to commercialization. Here, simple liquid phase atomic layer deposition is used to deposit an alumina layer to protect nickel particles from sintering. In the gas phase, it is proved that alumina can prevent sintering during reduction up to 600 °C. This catalyst for hydr...

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First-principles kinetics study of carbon monoxide promoted Ostwald ripening of Au particles on FeO/Pt(111)

Cited by 13 publications

References 87 publications

Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance

Direct Dimethyl Carbonates Synthesis over CeO2 and Evaluation of Catalyst Morphology Role in Catalytic Performance

Influence of Particle Size Distribution on Lifetime and Thermal Stability of Ostwald Ripening of Supported Particles

Sinter‐Resistant Nickel Catalyst for Lignin Hydrogenolysis Achieved by Liquid Phase Atomic Layer Deposition of Alumina

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