Constructing Active Sites from Atomic‐Scale Geometrical Engineering in Spinel Oxide Solid Solutions for Efficient and Robust Oxygen Evolution Reaction Electrocatalysts DOI
Xin Yue, Xueping Qin, Yangdong Chen

и другие.

Advanced Science, Год журнала: 2021, Номер 8(17)

Опубликована: Июль 9, 2021

Spinel oxides are considered as promising low-cost non-precious metal electrocatalysts for oxygen evolution reaction (OER) due to their desirable catalytic activities and fast kinetics. However, a result of the structural complexity spinel oxides, systematic in-depth studies on enhancing OER performance remain inadequate. In particular, construction active sites regarding large number unoccupied octahedral interstices has not yet been explored. Herein, more with high constructed surface via cationic misalignment, which is induced by defects in oxide solutions, i.e., MoFe2 O4 CoFe2 nanosheets supported an iron foam (MCFO NS/IF). With increased modified electronic structure, state-of-the-art electrocatalyst exhibits excellent activity onset potential 1.41 V versus RHE overpotential 290 mV achieve current density 500 mA cm-2 . Moreover, such also demonstrates kinetics Tafel slope 38 dec-1 superior durability maintaining at 250 1000 h.

Язык: Английский

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis DOI
Qiang Zhang, Shiqin Gao, Jihong Yu

и другие.

Chemical Reviews, Год журнала: 2022, Номер 123(9), С. 6039 - 6106

Опубликована: Сен. 1, 2022

Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, nanoparticles in the framework-associated sites extra-framework positions, thus affording metal-in-zeolite catalysts outstanding activity, unique shape selectivity, enhanced recyclability processes of Brønsted acid-, Lewis metal-catalyzed reactions. Especially, thanks to advances zeolite synthesis characterization techniques recent years, zeolite-confined (denoted as metal@zeolite composites) have experienced rapid development heterogeneous catalysis, owing combination merits both intrinsic properties. In this review, we will present developments strategies incorporating tailoring zeolites advanced identification location, distribution, coordination environment species zeolites. Furthermore, catalytic applications demonstrated, emphasis on composites hydrogenation, dehydrogenation, oxidation Finally, point out current challenges future perspectives precise synthesis, atomic level identification, practical application catalyst system.

Язык: Английский

Процитировано

337

Advances in Catalytic Applications of Zeolite‐Supported Metal Catalysts DOI
Qiming Sun, Ning Wang, Jihong Yu

и другие.

Advanced Materials, Год журнала: 2021, Номер 33(51)

Опубликована: Окт. 5, 2021

Abstract Zeolites possessing large specific surface areas, ordered micropores, and adjustable acidity/basicity have emerged as ideal supports to immobilize metal species with small sizes high dispersities. In recent years, the zeolite‐supported catalysts been widely used in diverse catalytic processes, showing excellent activity, superior thermal/hydrothermal stability, unique shape‐selectivity. this review, a comprehensive summary of state‐of‐the‐art achievements applications are presented for important heterogeneous processes last five mainly including 1) hydrogenation reactions (e.g., CO/CO 2 hydrogenation, unsaturated compounds, nitrogenous compounds); 2) dehydrogenation alkane chemical hydrogen storage materials); 3) oxidation CO oxidation, methane alkene epoxidation); 4) other hydroisomerization reaction selective reduction NO x ammonia reaction). Finally, some current limitations future perspectives on challenge opportunity subject pointed out. It is believed that review will inspire more innovative research synthesis catalysis promote their developments meet emerging demands practical applications.

Язык: Английский

Процитировано

217

Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites DOI Creative Commons
Yulong Shan, Jinpeng Du, Yan Zhang

и другие.

National Science Review, Год журнала: 2021, Номер 8(10)

Опубликована: Янв. 15, 2021

Abstract Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective reduction of NOx ammonia (NH3-SCR) well high hydrothermal stability. This review summarizes major advances applied to NH3-SCR reaction, including state copper species, standard fast SCR reaction mechanism, deactivation poisoning resistance synthetic methodology. The gives a valuable summary new insights into matching between catalyst design principles characteristics Cu2+-exchanged zeolitic highlighting significant opportunity presented by zeolite-based catalysts. Principles designing zeolites performance stability proposed. On basis these principles, more hydrothermally Cu-AEI Cu-LTA elaborated other alternative NH3-SCR. Finally, we call attention challenges facing Cu-based that still need be addressed.

Язык: Английский

Процитировано

211

On the Redox Mechanism of Low‐Temperature NH3‐SCR over Cu‐CHA: A Combined Experimental and Theoretical Study of the Reduction Half Cycle DOI
Wenshuo Hu, Tommaso Selleri, Federica Gramigni

и другие.

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(13), С. 7197 - 7204

Опубликована: Янв. 6, 2021

Abstract Cu‐CHA is the state‐of‐the‐art catalyst for Selective Catalytic Reduction (SCR) of NOx in vehicle applications. Although extensively studied, diverse mechanistic proposals still stand terms nature active Cu‐ions and reaction pathways SCR working conditions. Herein we address redox mechanism underlying Low‐Temperature (LT) on by an integration chemical‐trapping techniques, transient‐response methods, operando UV/Vis‐NIR spectroscopy with modelling tools based transient kinetic analysis density functional theory calculations. We show that rates Half‐Cycle (RHC) LT‐SCR display a quadratic dependence Cu II , thus questioning mechanisms isolated ‐ions. propose, instead, ‐pair mediated LT‐RHC pathway, which NO oxidative activation to mobile nitrite‐precursor intermediates accounts reduction. These results highlight role dinuclear complexes not only oxidation part LT‐SCR, but also RHC cascade.

Язык: Английский

Процитировано

110

Integrating Enrichment, Reduction, and Oxidation Sites in One System for Artificial Photosynthetic Diluted CO2 Reduction DOI
Yan Yang,

Hong‐Yu Zhang,

Ya Wang

и другие.

Advanced Materials, Год журнала: 2023, Номер 35(40)

Опубликована: Июнь 26, 2023

Artificial photosynthetic diluted CO2 reduction directly driven by natural sunlight is a challenging, but promising way to realize carbon-resources recycling utilization. Herein, three-in-one photocatalytic system of enrichment, and H2 O oxidation sites designed for reduction. A Zn-Salen-based covalent organic framework (Zn-S-COF) with reductive synthesized; then, ionic liquids (ILs) are loaded into the pores. As result, [Emim]BF4 @Zn-S-COF shows visible-light-driven -to-CO conversion rate 105.88 µmol g-1 h-1 under (15%) atmosphere, even superior than most photocatalysts in high concentrations . Moreover, also reaches 126.51 5 h. Further experiments theoretical calculations reveal that triazine ring Zn-S-COF promotes activity sites, ILs provide an enriched realizing efficient

Язык: Английский

Процитировано

81

Strikingly distinctive NH3-SCR behavior over Cu-SSZ-13 in the presence of NO2 DOI Creative Commons
Yulong Shan, Guangzhi He, Jinpeng Du

и другие.

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Авг. 8, 2022

Commercial Cu-exchanged small-pore SSZ-13 (Cu-SSZ-13) zeolite catalysts are highly active for the standard selective catalytic reduction (SCR) of NO with NH

Язык: Английский

Процитировано

76

Morphology and composition dependence of multicomponent Cu-based nanoreactor for tandem electrocatalysis CO2 reduction DOI
Wanfeng Xiong, Duan‐Hui Si, Jun‐Dong Yi

и другие.

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 314, С. 121498 - 121498

Опубликована: Май 11, 2022

Язык: Английский

Процитировано

75

Influence of framework Al density in chabazite zeolites on copper ion mobility and reactivity during NOx selective catalytic reduction with NH3 DOI
Siddarth H. Krishna, Anshuman Goswami, Yujia Wang

и другие.

Nature Catalysis, Год журнала: 2023, Номер 6(3), С. 276 - 285

Опубликована: Март 20, 2023

Язык: Английский

Процитировано

67

Steering CO2 Electroreduction Selectivity U-Turn to Ethylene by Cu–Si Bonded Interface DOI
Wanfeng Xiong, Duan‐Hui Si, Hong-Fang Li

и другие.

Journal of the American Chemical Society, Год журнала: 2023, Номер 146(1), С. 289 - 297

Опубликована: Дек. 22, 2023

Copper (Cu), with the advantage of producing a deep reduction product, is unique catalyst for electrochemical CO2 (CO2RR). Designing Cu-based to trigger CO2RR multicarbon product and understanding accurate structure–activity relationship elucidating reaction mechanisms still remain challenge. Herein, we demonstrate rational design core–shell structured silica-copper (p-Cu@m-SiO2) through Cu–Si direct bonding efficient selective CO2RR. The interface fulfills inversion in selectivity. ratio C2H4/CH4 changes from 0.6 14.4 after silica modification, current density reaches high up 450 mA cm–2. kinetic isotopic effect, situ attenuated total reflection Fourier-transform infrared spectra, functional theory were applied elucidate mechanism. SiO2 shell stabilizes *H intermediate by forming Si–O–H inhibits hydrogen evolution effectively. Moreover, direct-bonded makes bare Cu sites larger charge density. Such stabilized *CHO activated *CO, promoting coupling *CO intermediates form C2H4. This work provides promising strategy designing catalysts C2H4 catalytic activity.

Язык: Английский

Процитировано

57

In Situ UV–Vis–NIR Absorption Spectroscopy and Catalysis DOI
Max L. Bols,

Jing Ma,

Fatima Rammal

и другие.

Chemical Reviews, Год журнала: 2024, Номер 124(5), С. 2352 - 2418

Опубликована: Фев. 26, 2024

This review highlights

Язык: Английский

Процитировано

26