Embedding isolated Fe species in titania increases olefins for oxidative propane dehydrogenation

Zhang, Xintong; Wang, Jingnan; Yao, Yongbin; Liu, Qiang; Lu, Fei; Wu, Xi

doi:10.1002/aic.18088

“…Comparing the N 2 catalytic activity of Mo SACs to different transition metal atoms (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, and Cd) anchored on a g-C 3 N 4 matrix, [216] it was shown that Mo SACs have a higher NRR capacity. In addition, transition metal oxide or sulfide-based atomic dispersion catalysts have also been widely used in traditional catalysis, for example, Professor Wang Xi's team [227] reported an effective cation-exchange strategy towards the development of TiO 2 nanosheets embedded isolated Fe species (Fe 1 -TiO 2 ) as a highly-active and stable catalyst for OPDH. It exhibits an olefin yield of 38.2 % at 520°C, 10.9 and 2.4 times higher than that of pure TiO 2 (3.5 %) and Fe 2 O 3 (15.6 %), respectively; and it shows a superior 100-h durability.…”

Section: Changing the Type Of Metal Atom In The Loadmentioning

confidence: 99%

Single‐Atom and Dual‐Atom Electrocatalysts: Synthesis and Applications

Yang,

Liu,

Chen

et al. 2023

ChemPlusChem

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Distinguishing themselves from nanostructured catalysts, single‐atom catalysts (SACs) typically consist of positively charged single metal and coordination atoms without any metal‐metal bonds. Dual‐atom catalysts (DACs) have emerged as extended family members of SACs in recent years. Both SACs and DACs possess characteristics that combine both homogeneous and heterogeneous catalysis, offering advantages such as uniform active sites and adjustable interactions with ligands, while also inheriting the high stability and recyclability associated with heterogeneous catalyst systems. They offer numerous advantages and are extensively utilized in the field of electrocatalysis, so they have emerged as one of the most prominent material research platforms in the direction of electrocatalysis. This review provides a comprehensive review of SACs and DACs in the field of electrocatalysis: encompassing economic production, elucidating electrocatalytic reaction pathways and associated mechanisms, uncovering structure‐performance relationships, and addressing major challenges and opportunities within this domain. Our objective is to present novel ideas for developing advanced synthesis strategies, precisely controlling the microstructure of catalytic active sites, establishing accurate structure‐activity relationships, unraveling potential mechanisms underlying electrocatalytic reactions, identifying more efficient reaction paths, and enhancing overall performance in electrocatalytic reactions.

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Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation

Yao,

Wang,

Liu

et al. 2024

Angewandte Chemie

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Simultaneously enhancing selectivity and stability on supported propane dehydrogenation (PDH) catalysts remains a formidable challenge. Here, we report a combined static and dynamic strategy to address these issues synergistically. Firstly, we demonstrate a feasible sol‐gel method for preparing atomically‐dispersed Bi‐decorated metal nanoparticle catalysts (MBi/Al2O3, M=Fe, Co, Ni, and Zn). In PDH testing, the total selectivity of by‐products (CH4 and C2H6) significantly decreases to 4 % for CoBi catalysts due to the static Bi‐doping, compared with 16 % for Co‐supported catalysts. Secondly, to enhance catalytic stability, we introduce a dynamic trace CO2 co‐feeding route. 10CoBi/Al2O3 catalysts exhibit superior durability against coke formation for 330 hours in PDH under a 40 % C3H8 atmosphere followed by pure C3H8 conditions at 600 °C while maintaining propylene selectivity at 96 %. Notably, introducing trace CO2 leads to a remarkable 6‐fold decrease in the deactivation rate constant (kd). Multiple characterizations and density functional theory calculations reveal that charge transfer from atomically‐distributed Bi to Co nanoparticles benefits lowering the energy of C3H6 adsorption thereby suppressing by‐products. Furthermore, the dynamic co‐feeding of trace CO2 facilitates coke removal, suppressing catalyst deactivation. The static Bi‐doping and dynamic trace CO2 co‐feeding strategy contributes simultaneously to increased selectivity and stability on supported PDH catalysts.

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Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation

Yao,

Wang,

Liu

et al. 2024

Angew Chem Int Ed

0

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Simultaneously enhancing selectivity and stability on supported propane dehydrogenation (PDH) catalysts remains a formidable challenge. Here, we report a combined static and dynamic strategy to address these issues synergistically. Firstly, we demonstrate a feasible sol‐gel method for preparing atomically‐dispersed Bi‐decorated metal nanoparticle catalysts (MBi/Al2O3, M=Fe, Co, Ni, and Zn). In PDH testing, the total selectivity of by‐products (CH4 and C2H6) significantly decreases to 4 % for CoBi catalysts due to the static Bi‐doping, compared with 16 % for Co‐supported catalysts. Secondly, to enhance catalytic stability, we introduce a dynamic trace CO2 co‐feeding route. 10CoBi/Al2O3 catalysts exhibit superior durability against coke formation for 330 hours in PDH under a 40 % C3H8 atmosphere followed by pure C3H8 conditions at 600 °C while maintaining propylene selectivity at 96 %. Notably, introducing trace CO2 leads to a remarkable 6‐fold decrease in the deactivation rate constant (kd). Multiple characterizations and density functional theory calculations reveal that charge transfer from atomically‐distributed Bi to Co nanoparticles benefits lowering the energy of C3H6 adsorption thereby suppressing by‐products. Furthermore, the dynamic co‐feeding of trace CO2 facilitates coke removal, suppressing catalyst deactivation. The static Bi‐doping and dynamic trace CO2 co‐feeding strategy contributes simultaneously to increased selectivity and stability on supported PDH catalysts.

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Embedding isolated Fe species in titania increases olefins for oxidative propane dehydrogenation

Cited by 5 publications

References 41 publications

Single‐Atom and Dual‐Atom Electrocatalysts: Synthesis and Applications

Single‐Atom and Dual‐Atom Electrocatalysts: Synthesis and Applications

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation

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Embedding isolated Fe species in titania increases olefins for oxidative propane dehydrogenation

Cited by 5 publications

References 41 publications

Single‐Atom and Dual‐Atom Electrocatalysts: Synthesis and Applications

Single‐Atom and Dual‐Atom Electrocatalysts: Synthesis and Applications

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO2 Co‐Feeding During Propane Dehydrogenation

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO2 Co‐Feeding During Propane Dehydrogenation

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Product

Resources

About

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation

Improving the Selectivity and Stability of Supported Cobalt Catalysts via Static Bi‐Doping and Dynamic Trace CO₂ Co‐Feeding During Propane Dehydrogenation