Polysaccharide-based hybrid nanostructures with tunable magnetic response

Torres-Martínez, Nubia E.; Durán-Guerrero, J.G.; Garza-Navarro, Marco A.; Rosa, Javier Rivera De la; Torres–Castro, Alejandro; González-González, V.

doi:10.1016/j.mseb.2019.04.007

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…Fe +3 led to another peak at 724 eV of Fe 2p 3/2 , and the remaining peak at 732 eV is a satellite peak. 30 Similarly, the deconvolution of the Co 2p peak in Co/Mo 2 C reveals peaks at 778.2, 780.6, 782.5, 786.1, 796.7, 798.4, and 802.7 eV (Figure 2d). The peaks at 778.2, 780.6, and 782.5 eV correspond to the Co metal, Co +3 , and Co +2 , respectively.…”

Section: Resultsmentioning

confidence: 79%

“…The deconvolution of peaks reveals the presence of α-Fe 2 O 3 at 718.8 eV, oxidized Fe at 726.1 eV. Fe +3 led to another peak at 724 eV of Fe 2p 3/2 , and the remaining peak at 732 eV is a satellite peak . Similarly, the deconvolution of the Co 2p peak in Co/Mo 2 C reveals peaks at 778.2, 780.6, 782.5, 786.1, 796.7, 798.4, and 802.7 eV (Figure d).…”

Section: Results and Discussionmentioning

confidence: 84%

“…The flow rates of reactant gases (H 2 , N 2 , Ar mL min −1 ) were as follows: (22.5, 7.5, 0), (37.5, 12.5, 0), (54,18,0), and (67.5, 22.5, 0) for NH 3 order, (25,5,30), (25,10,25), (25,15,20), and (25,20,15) for N 2 order, and (16,8,36), (22,8,30), (30,8,22), and (40,8,12) for H 2 order measurement. The reaction order of N 2 was determined at varying N 2 and Ar partial pressures but at a constant partial pressure of H 2 .…”

Section: Methodsmentioning

confidence: 99%

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Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Roy

Kumar

2020

ACS Appl. Energy Mater.

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The dissociation of nitrogen molecules over the catalyst surface is often treated as the reaction-limiting step for ammonia synthesis. Herein, we modified molybdenum carbide with transition metals (Fe and Co) to successfully shift the rate-determining step from dissociation of nitrogen molecules to the formation of −NH x species on the catalyst surface, which few catalysts have achieved. These catalysts illustrated stable performance for ammonia synthesis at ambient pressure. At 520 °C and 1 bar, the specific activity for Mo2C, Fe/Mo2C, and Co/Mo2C was calculated to be 8.58, 9.78, and 11.73 μmol h–1 m–2, respectively. Co/Mo2C showed the highest activity owing to its strong electron-donating ability to dissociate nitrogen molecules. X-ray photoelectron spectroscopy results suggested a strong interaction between molybdenum in the carbidic phase and the transition metals, signifying preferred migration of electrons from the transition metals to the Mo atoms. Such an interfacial phenomenon resembles to the electron metal–support interaction. Importantly, orders for hydrogen were positive, revealing that the catalyst surface was not poisoned by hydrogen. Further, characterization of spent catalysts disclosed that pyridinic and graphitic C–N bonds were present on the catalyst surface, which suggests that both Langmuir–Hinshelwood and Mars–van Krevelen mechanisms could co-exist and simultaneously contribute to generate ammonia.

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Section: Resultsmentioning

confidence: 79%

Section: Results and Discussionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

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Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Roy

Kumar

2020

ACS Appl. Energy Mater.

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Characterization of a magnetic hybrid film fabricated by the in-situ synthesis of iron oxide nanoparticles into ethyl cellulose polymer

Puente-Córdova

Melo²,

López-Walle³

et al. 2022

Cellulose

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Dual active sites for ammonia synthesis at ambient pressure

Roy

Kumar

2023

Journal of Environmental Chemical Engineering

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Polysaccharide-based hybrid nanostructures with tunable magnetic response

Cited by 3 publications

References 37 publications

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Characterization of a magnetic hybrid film fabricated by the in-situ synthesis of iron oxide nanoparticles into ethyl cellulose polymer

Dual active sites for ammonia synthesis at ambient pressure

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Polysaccharide-based hybrid nanostructures with tunable magnetic response

Cited by 3 publications

References 37 publications

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo2C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo2C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Characterization of a magnetic hybrid film fabricated by the in-situ synthesis of iron oxide nanoparticles into ethyl cellulose polymer

Dual active sites for ammonia synthesis at ambient pressure

Contact Info

Product

Resources

About

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo₂C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step