Revealing the effects of pore hierarchy and surface hydrophilic oxygen group on nano-confined mass transfer in heterogeneous catalytic desulfurization by porous carbon: A multiscale modelling study

Fuel, Journal Year: 2024, Volume and Issue: 381, P. 133411 - 133411

Published: Oct. 14, 2024

Language: Английский

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Influence of polymer support on gas transport in ultrathin zeolite membranes

Journal of Membrane Science, Journal Year: 2024, Volume and Issue: 697, P. 122510 - 122510

Published: Feb. 6, 2024

Ultrathin membranes, with nanoscale thickness, can offer remarkable separation performance, benefiting applications such as purification, catalysis, and drug delivery. However, interfacial defects finite-size effects lead to transport obstacles known surface barriers. Such apparent barriers are also present in defect-free nonuniform fluid the entry region of developing flow. Here, we examine support effect on gas through ultrathin zeolite membranes using atomistic simulations, by considering a composite system comprised siliceous Theta-1 nanosheet layer (one side) polymeric coating (both sides). Our simulations reveal that external polymer layers increase internal length achieve fully developed flow within crystal channels for light gases under low confinement. Potential energy profiles show chains influence molecules located up 0.8 nm into inner crystal, increasing further reducing diffusivities when compared bare nanosheets. We even one leads resistance comparable thin entry-length govern transport. The coated/supported exhibits maximum performance crystals lying range 7.3–15.2 nm. Additionally, our findings demonstrate coating/support control across zeolite-based nanocomposites due slow trajectories enhanced resistances, crucial designing high-performance membranes.

Language: Английский

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Colloidal Templating in Catalyst Design for Thermocatalysis

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(32), P. 22103 - 22121

Published: Aug. 5, 2024

Conventional catalyst preparative methods commonly entail the impregnation, precipitation, and/or immobilization of nanoparticles on their supports. While convenient, such do not readily afford ability to control collective ensemble-like nanoparticle properties, as proximity, placement, and compartmentalization. In this Perspective, we illustrate how incorporating colloidal templating into design for thermocatalysis confers synthetic advantages facilitate new catalytic investigations augment performance, focusing three colloid-templated structures: 3D macroporous structures, hierarchical macro-mesoporous discrete hollow nanoreactors. We outline decouples support formation steps devise modular platforms that can be flexibly tuned at different length scales. Of particular interest is raspberry colloid (RCT) method which high thermomechanical stability by partially embedding within its support, while retaining levels reactant accessibility. modularity RCT approach allows one independently proximity localization, without concomitant changes other descriptors would otherwise confound analyses performance. next discuss employed achieve spatially disparate active site functionalization directing transport structure enhance selectivity in multistep cascades. Throughout highlight developments advanced characterization interrogate phenomena derive insights these structures. Finally, offer our outlook future roles, applications, challenges thermocatalysis.

Language: Английский

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A novel ultra-high vacuum diffusion setup to study Knudsen diffusion

Reaction Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 9(11), P. 3047 - 3059

Published: Jan. 1, 2024

An ultra-high vacuum setup was conceived to study Knudsen diffusion in channels with varied geometrical characteristics that can be modified using 3D printing. This new experimental methodology aids gain insight into nanoporous media.

Language: Английский

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Tunable swelling features in poly(ionic liquid)s for intensified catalytical synthesis of ethyl methyl carbonate with high yield and selectivity

Chemical Engineering Science, Journal Year: 2024, Volume and Issue: 300, P. 120572 - 120572

Published: July 27, 2024

Language: Английский

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Effect of external surface barriers over hierarchical ZSM-5 zeolite on n-heptane catalytic cracking

Chemical Engineering Science, Journal Year: 2024, Volume and Issue: unknown, P. 120763 - 120763

Published: Sept. 1, 2024

Language: Английский

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Tailoring the surface islands to modulate the diffusion of guest molecules over the TS-1 zeolites for enhanced selectivity in the 1-hexene epoxidation

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 503, P. 158279 - 158279

Published: Dec. 6, 2024

Language: Английский

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Core‐Shell Zeolite with Confined Nickel Particles as Prominent Catalyst for the Hydrogenation of Maleic Anhydride

ChemCatChem, Journal Year: 2024, Volume and Issue: unknown

Published: May 1, 2024

Abstract Transformation of maleic anhydride (MA) into succinic (SA) through the development high‐performance catalysts is an appealing approach from a sustainable perspective. Herein, core‐shell catalyst with silicate‐1 supported and MCM‐41 encapsulated nickel was prepared, which exhibited extraordinarily high MA conversion (99.8 %) SA selectivity (99.9 %). Detailed structural characterizations catalytic evaluation demonstrated that derived liquid deposition method hierarchically porous material tunable shell thicknesses, possessing strong interaction between Ni particles supports. Key to this success covered defects such as silanol nests on surface zeolite, diminishing both intra‐particle diffusion barriers, thus specially‐designed achieved activity under rather mild conditions (100 °C, 3.0 MPa), 59 % higher than conventional catalyst. Furthermore, mesoporous plays crucial role in minimizing leaching sintering particles, thereby bolstering stability. Overall, research provides new for rational design optimize performance hydrogenation introduces novel idea enhance stability Ni‐supported catalysts.

Language: Английский

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Recent advantages on mass transfer structure construction in transition metal‐based cost‐effective catalyst toward alkaline oxygen evolution

ChemCatChem, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract The electrochemical oxygen evolution reaction (OER) can be combined with various reactions to fabricate energy conversion and storage devices while the slow kinetics poor mass transfer capability at high current densities are key constraints its large‐scale application. Therefore, this review primarily focuses on design optimization of structures TM‐metal‐based OER catalysts. Nanostructuring, porous design, creation hierarchical architectures have been applied during catalyst synthesis enhance surface area accessibility, thereby improving catalytic efficiency. Strategies including doping, substrate invitation, soft/hard templating utilized accelerate as well ion/electron conduction efficiency for overall improvement performance These developments underline critical role advanced material in achieving high‐performance catalysts highlight potential TM‐based materials cost‐effective scalable applications.

Language: Английский

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Porousizing catalysts for boosting CO2 electroreducation

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2024, Volume and Issue: 67, P. 4 - 20

Published: Dec. 1, 2024

Language: Английский

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