Cu–Ni@SiO2 alloy nanocomposites for methane dry reforming catalysis

Wu, Tao; Cai, Weiye; Zhang, Peng; Song, Xuefeng; Gao, Lian

doi:10.1039/c3ra43203c

Cited by 65 publications

(42 citation statements)

References 24 publications

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“…The higher the Cu/Ni ratio, the more it is expected to suppress catalyst activity when occupying the Ni active site. This result is consistent with the experimental results [22,24].…”

Section: Effect Of Temperature On Carbon Deposition Resistancesupporting

confidence: 93%

Mechanistic Insights for Dry Reforming of Methane on Cu/Ni Bimetallic Catalysts: DFT-Assisted Microkinetic Analysis for Coke Resistance

et al. 2020

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Density functional theory (DFT) calculations have been utilized to evaluate the complete reaction mechanism of methane dry reforming (DRM) over Ni2Cu (111) bimetallic catalyst. The detailed catalytic cycle on Ni2Cu (111) catalyst demonstrated superior coke resistance compared to pure Ni (111) and Ni2Fe (111) reported in the literature. Doping Cu in the Ni–Ni network enhanced the competitive CH oxidation by both atomic O and OH species with the latter having only 0.02 eV higher than the 1.06 eV energy barrier required for CH oxidation by atomic O. Among the C/CH oxidation pathways, C* + O* → CO (g) was the most favorable with an energy barrier of 0.72 eV. This was almost half of the energy barrier required for the rate-limiting step of CH decomposition (1.40 eV) and indicated enhanced coke deposition removal. Finally, we investigated the effect of temperature (800~1000 K) on the carbon deposition and elimination mechanism over Ni2Cu (111) catalyst. Under those realistic DRM conditions, the calculations showed a periodic cycle of simultaneous carbon deposition and elimination resulting in improved catalyst stability.

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“…The higher the Cu/Ni ratio, the more it is expected to suppress catalyst activity when occupying the Ni active site. This result is consistent with the experimental results [22,24].…”

Section: Effect Of Temperature On Carbon Deposition Resistancesupporting

confidence: 93%

Mechanistic Insights for Dry Reforming of Methane on Cu/Ni Bimetallic Catalysts: DFT-Assisted Microkinetic Analysis for Coke Resistance

et al. 2020

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“…Hence, Ni‐based core–shell catalysts show remarkable stability and high catalytic activity during dry reforming of methane . Wu and co‐workers utilized a microemulsion method and successfully fabricated Cu‐Ni@SiO 2 core@shell catalysts with monodisperse Cu‐Ni alloy nanoparticles in the range of 12±3 nm . During the synthesis, hydrolyzed silica encapsulated micelles consisting of Cu‐Ni nanoparticles.…”

Section: Recent Developments On Ni‐based Bimetallic Catalystsmentioning

confidence: 99%

A Review on Bimetallic Nickel‐Based Catalysts for CO₂ Reforming of Methane

et al. 2017

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In recent years, CO2 reforming of methane (dry reforming of methane, DRM) has become an attractive research area because it converts two major greenhouse gasses into syngas (CO and H2), which can be directly used as fuel or feedstock for the chemical industry. Ni‐based catalysts have been extensively used for DRM because of its low cost and good activity. A major concern with Ni‐based catalysts in DRM is severe carbon deposition leading to catalyst deactivation, and a lot of effort has been put into the design and synthesis of stable Ni catalysts with high carbon resistance. One effective and practical strategy is to introduce a second metal to obtain bimetallic Ni‐based catalysts. The synergistic effect between Ni and the second metal has been shown to increase the carbon resistance of the catalyst significantly. In this review, a detailed discussion on the development of bimetallic Ni‐based catalysts for DRM including nickel alloyed with noble metals (Pt, Ru, Ir etc.) and transition metals (Co, Fe, Cu) is presented. Special emphasis has been provided on the underlying principles that lead to synergistic effects and enhance catalyst performance. Finally, an outlook is presented for the future development of Ni‐based bimetallic catalysts.

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“…In order to prepare small metal nanoparticles for DRM, especially for base metals such as Ni, several efforts [10,[21][22][23][24][25][26][27] have been reported, confining the metal or its precursors in welldefined structures, including inorganic frameworks [28][29][30][31][32][33][34] and organic colloids [21]. Catalysts…”

Section: Introductionmentioning

confidence: 99%