Reversed Charge Transfer Enables Dual Active Sites on Ir/hBN for Synergistic N₂O Valorization and Propane Selective Oxidation

ACS Catalysis, Год журнала: 2024, Номер 14(17), С. 13520 - 13530

Опубликована: Авг. 27, 2024

Valorization of nitrous oxide (N2O) as a mild oxygen source for light alkanes presents promising and economical method mitigating global warming. However, activating N2O alkane together often leads to overoxidation poor selectivity the products. To disentangle trade-off between activity selectivity, herein, an Ir-based hexagonal boron nitride (hBN) catalyst was synthesized obtain reversed charge transfer (RCT) from support metal centers, forming dual active sites on Ir clusters separation redox determined via operando near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS) density functional theory (DFT) calculations. Ir/hBN demonstrated high conversion (99.5%) syngas yield (95.9 mol CO kgcat–1 h–1 41.9 H2 h–1) during selective oxidation propane (C3H8) at 450 °C. The electron-rich interfacial perimeter (Irδ−) enhance adsorption N–O bond dissociation produce O*; however, facial metallic Ir0 effectively facilitate C3H8 activation, including dehydrogenation cracking. H* O* intermediates, along with frustrated H*/O* spillover, facilitates formation H2. *CH2 intermediate breakage migrates reacts bound sites, where it is oxidized CO32– subsequently liberates CO. This study provides mechanistic insights into O element valorization synergetic enhancement in alkanes.

Язык: Английский

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Unveiling the mechanism of CO–SCR reaction over Ir/SiO2 catalyst in the presence of multiple components (CO, O2, SO2)

Applied Catalysis B Environment and Energy, Год журнала: 2025, Номер unknown, С. 125066 - 125066

Опубликована: Янв. 1, 2025

Язык: Английский

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Pretreatment techniques in CO-SCR and NH3-SCR: Status, challenges, and perspectives

Journal of Catalysis, Год журнала: 2024, Номер unknown, С. 115925 - 115925

Опубликована: Дек. 1, 2024

Язык: Английский

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Co⁰ and CoO_x Nanoclusters Encapsulated in Carbon Microspheres for the Low‐Temperature Enhanced Reduction of NO_x by CO

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Abstract Efficient low‐temperature NO reduction by transition metal‐based catalysts remains a significant challenge. In this study, Co‐based catalyst, Co 0 +CoO x @CS, encapsulated carbon microspheres and synthesized via one‐step in situ hydrothermal method, exhibits excellent conversion, exceeding 99% at 150 °C. X‐ray Absorption Fine Structure analysis reveals electronic interactions between C Co, anchoring nanoclusters to the microspheres. The resulting microporous structure enhances reactant accessibility facilitates N─O bond cleavage. Furthermore, 13 O isotopic tracing experiments reveal that follows an ONNO pathway, which adsorbed CO induces dissociation of * ONN , weakly or gaseous promotes further decomposition N 2 . Specifically, species enhance adsorption, while CoO favor with oxygen vacancy‐mediated transfer driving catalytic cycle. This study presents novel approach for preparing offers effective strategy efficient reduction.

Язык: Английский

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Co-based catalysts for the reduction of NOx with CO via the regulation of geometric and electronic structure

Coordination Chemistry Reviews, Год журнала: 2025, Номер 532, С. 216502 - 216502

Опубликована: Фев. 17, 2025

Язык: Английский

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Unraveling the origin of high-efficiency performance of CeCu bimetallic quasi-MOFs catalysts for the selective catalytic reduction of NO by CO

Separation and Purification Technology, Год журнала: 2025, Номер unknown, С. 133369 - 133369

Опубликована: Май 1, 2025

Язык: Английский

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