Solar energy storage to chemical: Photocatalytic CO2 reduction over pristine metal-organic frameworks with mechanistic studies

Journal of Energy Storage, Journal Year: 2023, Volume and Issue: 75, P. 109725 - 109725

Published: Nov. 19, 2023

Language: Английский

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Significance of Epitaxial Growth of PtO₂ on Rutile TiO₂ for Pt/TiO₂ Catalysts

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(6), P. 3764 - 3772

Published: Feb. 2, 2024

TiO2-supported Pt species have been widely applied in numerous critical reactions involving photo-, thermo-, and electrochemical-catalysis for decades. Manipulation of the state Pt/TiO2 catalysts is crucial fine-tuning their catalytic performance. Here, we report an interesting discovery showing epitaxial growth PtO2 atomic layers on rutile TiO2, potentially allowing control states active catalysts. The presence could modulate geometric configuration electronic under reduction conditions, resulting a spread particle shape obtaining Pt/PtO2/TiO2 structure with more positive valence species. As result, such catalyst exhibits exceptional electrocatalytic activity stability toward hydrogen evolution reaction, while also promoting thermocatalytic CO oxidation, surpassing performance no structure. This novel TiO2 shows its potential rational design highly economical diverse reactions.

Language: Английский

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Revealing the Size Effect of Ceria Nanocube-Supported Platinum Nanoparticles in Complete Propane Oxidation

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(4), P. 2532 - 2544

Published: Feb. 2, 2024

The elimination of propane is one the key tasks in reducing volatile organic compounds (VOCs) and automotive exhaust emissions. platinum nanoparticle (NP) a promising catalyst for oxidation, while study its structural characteristics functionality remains infancy. In this work, we synthesized nanocubes CeO2 with well-defined (100) facet supporting Pt NPs various sizes, from 1.3 to 7 nm, systematically investigated effect size on complete oxidation efficiency. particular, CeO2(100) supported smaller than 4 nm promote formation positively charged sites, which hinder adsorption activation reduce intrinsic activity oxidation. Consequently, within range, catalytic performance primarily influenced by electronic state species, metallic being identified as active site reaction. Conversely, particle exceeds particles become dominant geometric structure starts influence well. Such entanglement factors gives rise volcano relationship between reaction rates sizes ranging an increased correlation can be observed turnover frequencies range. This knowledge guide synthesis highly catalysts, enabling efficient VOCs reduced precious metal loadings.

Language: Английский

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Contact-separation-induced self-recoverable mechanoluminescence of CaF2:Tb3+/PDMS elastomer

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 5, 2024

Abstract Centrosymmetric-oxide/polydimethylsiloxane elastomers emit ultra-strong non-pre-irradiation mechanoluminescence under stress and are considered one of the most ideal materials. However, previous centrosymmetric-oxide/polydimethylsiloxane show severe degradation stretching, which limits their use in applications. Here we an elastomer based on centrosymmetric fluoride CaF 2 :Tb 3+ polydimethylsiloxane, with that can self-recover after each stretching. Experimentation indicates self-recoverable /polydimethylsiloxane occurs essentially due to contact electrification arising from contact-separation interactions between phosphors polydimethylsiloxane. Accordingly, a cycle model phosphor–polydimethylsiloxane couple is established, first-principles calculations performed state energies cycle. The results reveal fluoride–polydimethylsiloxane helps induce maintain at interface, resulting elastomer. Therefore, it would be good strategy develop

Language: Английский

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Evaluation of various properties for spent alumina catalyst and Si₃N₄ reinforced with PET-based polymer composite

Mechanics of Advanced Materials and Structures, Journal Year: 2023, Volume and Issue: 31(26), P. 7777 - 7787

Published: Sept. 5, 2023

AbstractIn the present work, mechanical, physical, wettability, and microstructure characterization were employed to evaluate performance of composite material. Uniform distribution with a good interfacial layer SAC Si3N4 was observed for PET/8.75%Si3N4+8.75% wasteSAC powder Results showed significant improvements in tensile (60.55%), hardness (150.99%), bending (228.47%), compressive strength (105.56%) compared neat PET-based composites after addition 8.75%Si3N4+8.75% powder. Therefore, studied could be replacement metals ceramics, various structural functional applications due their improved mechanical thermal properties.Keywords: Interfacial bondingSi3N4SACmechanical propertiespolymer compositepolyethylene terephthalate (PET) Disclosure statementNo potential conflict interest reported by author(s).

Language: Английский

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Investigation of kinetics, thermodynamics, and environmental factors of biodiesel generation from sunflower and castor oil using rice husk ash/CuO/K2CO3 heterogeneous catalyst

Environmental Technology & Innovation, Journal Year: 2023, Volume and Issue: 32, P. 103307 - 103307

Published: July 27, 2023

In the current study, rice husk ash (RHA) was used as a support in fabrication of heterogeneous catalyst (RHA/CuO/K2CO3) for generating biodiesel from sunflower and castor oil. The value specific surface RHA, CuO, RHA/CuO, RHA/CuO/K2CO3 determined to be 3.63, 54.29, 25.47, 8.17 m2/g, respectively. Based on average roughness (Ra), inclusion CuO RHA structure improved which can improve interaction active phase (K2CO3) with structure. maximum production (99.2%) oil (98.1%) obtained at amount 3 wt%, 'CH3OH: oil' molar ratio 18:1, reaction temperature 65 °C, time 120 min. activation energy transesterification process calculated 52.79 40.09 kJ/mol, Also, ΔH number 50.05 37.35 respectively, shows that is an endothermic process. environmental factor (< 0.5), biocompatibility produced fuel confirmed. It should noted quality according ASTM D6751 EN 14214 standards replace traditional diesel.

Language: Английский

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Edible waste oil to biofuel using reclaimable g-C3N4/HAp/Fe3O4/K2CO3 nanobiocomposite catalyst: Toxicity evaluation and optimization

Environmental Technology & Innovation, Journal Year: 2023, Volume and Issue: 32, P. 103403 - 103403

Published: Oct. 12, 2023

In the current work, new heterogeneous nonobiocomposite of g-C3N4/HAp/Fe3O4/K2CO3 was made from chicken bone and melamine used in biofuel generation edible waste oil (EWO). FTIR, SEM, Map-EDX, BET, VSM, XRD techniques confirmed that catalyst synthesized. The magnetic saturation number BET value were determined to be 8.89 emu.g-1 3.95 m2.g-1, respectively. impact temperature, time, mass, ratio methanol: Oil (MeOH: Oil) on production explored using response surface method-central composite design. maximum yield EWO (98.52%) achieved at contact time 150 min, temperature 65 oC, amount 3 wt%, MeOH: 15:1. Activation energy k0 for transesterification process computed 58.91 kJ.mol-1 3.24×107 min-1, values ΔH ΔG positive process, which indicates is exothermic non-spontaneous. environmental factor (E) also showed has negligible harmful effects environment. can effectively reused many times process. produced good compliance with famous standards serve as a suitable fuel source.

Language: Английский

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A review on the active sites for direct oxidation of methane to methanol by copper-zeolites: Coordination structure, formation and activity

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 503, P. 215637 - 215637

Published: Jan. 10, 2024

Language: Английский

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Expediting layered oxide cathodes based on electronic structure engineering for sodium-ion batteries: Reversible phase transformation, abnormal structural regulation, and stable anionic redox

Nano Energy, Journal Year: 2024, Volume and Issue: 128, P. 109905 - 109905

Published: June 21, 2024

Language: Английский

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HPW Monomer-Confined FAU Zeolite with Modulated Acidity for Efficient Benzene Alkylation

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 4294 - 4306

Published: Feb. 25, 2025

Language: Английский

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