Ultrafine PtRu nanoparticles confined in hierarchically porous carbon derived from micro-mesoporous zeolite for enhanced nitroarenes reduction performance

Gao, Daowei; Li, Shuna; Wang, Xilong; Xi, Lifei; Lange, Kathrin M.; Ma, Xinlong; Lv, Yipin; Yang, Shaohan; Zhao, Kaixuan; Loussala, Herman Maloko; Duan, Aijun; Zhang, Xin; Chen, Guozhu

doi:10.1016/j.jcat.2019.01.011

Cited by 29 publications

(9 citation statements)

References 56 publications

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“…After the directional replacement, the diffraction peak of Zn (101) was not seen in Pt@NDPCF, proving the consumption of Zn nanoparticles. In addition, the diffraction peak of Pt is not evident from XRD, which could be ascribed to the ultrafine size of Pt and their embedding into the carbon framework. , To characterize the porosity of Pt@NDPCF, nitrogen physisorption analyses were conducted and the curves are shown in Figure b. ZIF-8 is a typical microporous material, and the type-I curve at P / P 0 = 0 proves the microporous feature of ZIF-8, while the type-IV curve at P / P 0 = 1 is probably due to mesoporous defects or interparticle voids because of the nanosize.…”

Section: Resultsmentioning

confidence: 99%

Confined Ultrafine Pt in Porous Carbon Fibers and Their N-Enhanced Heavy d-π Effect

et al. 2022

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The heavy d-π effect is an important theoretical model for strong Pt–C interaction, and its enhancement is critical to the high-performance design of Pt/C electrocatalysts. Common chemical N-doping to the carbon support can provide possibilities for enhanced electrocatalysis but most often leads to random interaction with Pt nanoparticles (Pt-NPs) and uncontrollable tuning of the heavy d-π effect. Directional confinement of Pt-NPs within N-doped carbon to directly enhance the heavy d-π effect is therefore mostly preferred but rarely reported. Herein, confined ultrafine Pt-NPs in N-doped porous carbon fibers (Pt@NDPCF) were obtained by a combination method involving electrospinning, carbonization, and directional replacement. Such a synthetic strategy leads to highly dispersed, ultrafine Pt-NPs in hierarchically porous carbon fibers and a strong directional interaction of Pt with pyridinic N, which significantly enhances the heavy d-π effect, greatly facilitating electron transfer and optimizing Pt 5d orbitals. Based on these advances, Pt@NDPCF exhibited outstanding activity and superior durability in the hydrogen evolution reaction (HER), with 24 mV lower overpotential at 10 mA cm–2 and a much smaller activity loss after 10,000 cycles of durability tests in comparison with a commercial Pt/C catalyst. This work sheds new lights on the design of high-performance Pt-based nanomaterials toward HER or other practical applications.

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Section: Resultsmentioning

confidence: 99%

Confined Ultrafine Pt in Porous Carbon Fibers and Their N-Enhanced Heavy d-π Effect

et al. 2022

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“…Herein, no obvious dehalogenation product was observed in the selective hydrogenation of the halogen-substituted nitroarenes (entries 8-13). Moreover, other reducible groups such as -COOCH 2 CH 3 , -COOH, -CN, and -CHO on the nitrobenzene were also well tolerated to give the corresponding amines in high selectivity (entries [14][15][16][17]. Also, for heterocyclic nitroarenes containing N element, full conversion and high selectivity of >99.0% was achieved (entries [19][20][21][22].…”

Section: Catalytic Reactionmentioning

confidence: 98%

“…Downsizing the noble metal particles to a few nanometers can dramatically improve their catalytic activity, due to the increasing surface-to-atom ratio [12,13]. However, the supported small metal nanoparticles often suffer from serious aggregation because of the high surface energy [14][15][16]. In addition, it remains challenging to keep other reducible groups, especially the halogen groups (F, Cl, Br, and I), intact at high conversion rates when using noble metal catalysts with H 2 as the hydrogen source [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Highly Dispersed Pt Nanoparticles on N-Doped Ordered Mesoporous Carbon as Effective Catalysts for Selective Hydrogenation of Nitroarenes

et al. 2020

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Highly-dispersed Pt nanoparticles supported on nitrogen-modified CMK-3 mesoporous carbon (Pt/N-CMK-3) were first fabricated by a two-step impregnation route. The influences of N content on the catalyst porous structure, Pt nanoparticle size, surface properties, and interaction between Pt species and the support were investigated in detail using N2 sorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectra (XPS). The N species acted as anchoring sites for the stabilization of Pt particles. Benefiting from the formation of ultrafine metal nanoparticles, the Pt/N-CMK-3 exhibited excellent catalytic activity and selectivity for the selective hydrogenation of nitro aromatics to the corresponding anilines with hydrogen. The Pt/N-CMK-3 catalyst could be reused eight times and keep its catalytic performance.

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“…Wang et al [ 47 ] also reported the reduction of Ru 4+ to metallic ruthenium Ru 0 . Gao et al [ 48 ] also studied the Ru containing catalysts and they assigned the observed reduction stages to well-dispersed RuO x and RuO x with strong interaction with support surface species.…”

Section: Resultsmentioning

confidence: 99%

Biodiesel Production on Monometallic Pt, Pd, Ru, and Ag Catalysts Supported on Natural Zeolite

et al. 2020

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Biodiesel production from rapeseed oil and methanol via transesterification reaction facilitated by various monometallic catalyst supported on natural zeolite (NZ) was investigated. The physicochemical characteristics of the synthesized catalysts were studied by X-ray diffraction (XRD), Brunauer–Emmett–Teller method (BET), temperature-programmed-reduction in hydrogen (H2-TPR), temperature-programmed-desorption of ammonia (NH3-TPD), Scanning Electron Microscope equipped with EDX detector (SEM-EDS), and X-ray photoelectron spectroscopy (XPS) methods. The highest activity and methyl ester yields were obtained for the Pt/NZ catalyst. This catalyst showed the highest triglycerides conversion of 98.9% and fatty acids methyl esters yields of 94.6%. The activity results also confirmed the high activity of the carrier material (NZ) itself in the investigated reaction. Support material exhibited 90.5% of TG conversion and the Fatty Acid Methyl Esters yield (FAME) of 67.2%. Introduction of noble metals improves the TG conversion and FAME yield values. Increasing of the metal loading from 0.5 to 2 wt.% improves the reactivity properties of the investigated catalysts.

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Ultrafine PtRu nanoparticles confined in hierarchically porous carbon derived from micro-mesoporous zeolite for enhanced nitroarenes reduction performance

Cited by 29 publications

References 56 publications

Confined Ultrafine Pt in Porous Carbon Fibers and Their N-Enhanced Heavy d-π Effect

Confined Ultrafine Pt in Porous Carbon Fibers and Their N-Enhanced Heavy d-π Effect

Highly Dispersed Pt Nanoparticles on N-Doped Ordered Mesoporous Carbon as Effective Catalysts for Selective Hydrogenation of Nitroarenes

Biodiesel Production on Monometallic Pt, Pd, Ru, and Ag Catalysts Supported on Natural Zeolite

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