Multiply Confined Nickel Nanocatalysts Produced by Atomic Layer Deposition for Hydrogenation Reactions

Gao, Zhe; Dong, Mei; Wang, Guizhen; Sheng, Pei; Wu, Zhiwei; Yang, Huimin; Zhang, Bin; Wang, Guofu; Wang, Jianguo; Qin, Yong

doi:10.1002/ange.201503749

Cited by 24 publications

(8 citation statements)

References 37 publications

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“…By confining active nanoparticles inside the nanotube spaces, the sintering, aggregation, detachment and poisoning can be inhibited effectively [41]. Recently, Qin's group designed various confined structures (e.g., CoO x /SBA-15 [42] and Ni-in-ANTs [43]) using a simple atomic layer deposition (ALD) technology to synthesize highly efficient catalysts. Fortunately, these structures showed excellent recycling stability.…”

Section: Other Mesoporous Materialsmentioning

confidence: 99%

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Cao

Zhou

et al. 2019

Rare Met.

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Supported metal nanoparticles (NPs) as an important heterogeneous catalyst have been widely applied in various industrial processes. During the catalytic reaction, size of the particles plays an important role in determining their catalytic performance. Generally, the small particles exhibit superior catalytic activity in comparison with the larger particles because of an increase in lowcoordinated metal atoms on the particle surface that work as active sites, such as edges and corner atoms. However, these small NPs are typically unstable and tend to migrate and coalescence to reduce their surface free energy during the real catalytic processes, particularly in high-temperature reactions. Therefore, a means to fabricate stable small metal NP catalysts with excellent sinter-resistant performance is necessary for maintaining their high catalytic activity. In this study, we have summarized recent advances in stabilizing metal NPs from two aspects including thermodynamic and kinetic strategies. The former mainly involve preparing uniform NPs (with an identical size and homogeneous distribution) in order to restrain Ostwald ripening to achieve stability, while the latter primarily involves fixing metal NPs in some special confinement materials (e.g., zeolites, mesoporous silica and mesoporous carbons), encapsulating NPs using an oxide-coating film (e.g., forming core-shell structures), or constructing strong metal-support interactions to improve stability. At the end of this review, we highlight our recent work on the preparation of high-stability metal catalysts via a unique interfacial plasma electrolytic oxidation technology, that is, metal NPs are well embedded in a porous MgO layer that has both high thermal stability and excellent catalytic activity.

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Section: Other Mesoporous Materialsmentioning

confidence: 99%

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Cao

Zhou

et al. 2019

Rare Met.

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“…The gas-phase preparation of support materials (e.g. carbon nanocoils (Gao et al, 2015) or TiSi2 nanonets (Lin, Zhou, Sheehan, & Wang, 2011) made by CVD) and the modification or change of surface functionality (e.g. Ni nanocatalyst growth (Gao et al, 2015) or the deposition of Fe2O3 seeding layer by ALD (Lin et al, 2011)) can be carried out in one reactor vessel (Selvaraj, Jursich, & Takoudis, 2013), removing a number of separation-related unit operations and greatly simplifying the process.…”

Section: Atomic Layer Deposition For Particle Nanostructuringmentioning

confidence: 99%

Advances in scalable gas-phase manufacturing and processing of nanostructured solids: A review

et al. 2017

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Although the gas-phase production of nanostructured solids has already been carried out in industry for decades, only in recent years has research interest in this topic begun to increase. Nevertheless, despite the remarkable scientific progress made recently, many long-established processes are still used in industry.Scientific advancements can potentially lead to the improvement of existing industrial processes, but also to the development of completely new routes. This paper aims to review state-of-the-art synthesis and processing technologies, as well as the recent developments academic research. Flame reactors that produce inorganic nanoparticles on industrial-and lab-scales are described, alongside a detailed overview of the different systems used for the production of carbon nanotubes and graphene. We discuss the problems of agglomeration and mixing of nanoparticles, which are strongly related to synthesis and processing. Finally, we focus on two promising processing techniques, namely nanoparticle fluidization and atomic layer deposition.

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“… 15 , 16 In recent decades, advanced catalysts were synthesized by precisely controlling the size, interface, and pore structures via ALD at the atomic and molecular levels. 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 Moreover, ALD strategies have been developed to design and synthesize well-defined catalysts with complex functional structures, such as confined catalysts, 25 , 26 , 27 sandwich catalysts, 28 catalysts with spatially separated metal structures, 29 , 30 tube-in-tube catalysts, 31 and encapsulated catalysts. 21 The confinement effect, the function of the metal-oxide interface, and the synergy effect have been well investigated and revealed in these catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Distance Effect of Ni-Pt Dual Sites for Active Hydrogen Transfer in Tandem Reaction

Zhang

Liang

et al. 2020

The Innovation

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Unveiling the distance effect between different sites in multifunctional catalysts remains a major challenge. Herein, we investigate the distance effect by constructing a dual-site distance-controlled tandem catalyst with a five-layered TiO 2 /Pt/TiO 2 /Ni/TiO 2 tubular nanostructure by template-assisted atomic layer deposition. In this catalyst, the Ni and Pt sites are separated by a porous TiO 2 interlayer, and the distance between them can be precisely controlled on the subnanometer scale by altering the thickness of the interlayer, while the inner and outer porous TiO 2 layers are designed for structural stability. The catalyst exhibits superior performance for the tandem hydrazine hydrate decomposition to hydrogen and subsequent nitrobenzene hydrogenation when the Ni and Pt site distance is on the subnanometer level. The performance increases with the decrease of the distance and is better than the catalyst without the TiO 2 interlayer. Isotopic and kinetic experiments reveal that the distance effect controls the transfer of active hydrogen, which is the rate-determining step of the tandem reaction in a water solvent. Reduced Ti species with oxygen vacancies on the TiO 2 interlayer provide the active sites for hydrogen transfer with -Ti-OH surface intermediates via the continuous chemisorption/desorption of water. A smaller distance induces the generation of more active sites for hydrogen transfer and thus higher efficiency in the synergy of Ni and Pt sites. Our work provides new insight for the distance effect of different active sites and the mechanism of intermediate transfer in tandem reactions.

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Multiply Confined Nickel Nanocatalysts Produced by Atomic Layer Deposition for Hydrogenation Reactions

Cited by 24 publications

References 37 publications

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Advances in scalable gas-phase manufacturing and processing of nanostructured solids: A review

Distance Effect of Ni-Pt Dual Sites for Active Hydrogen Transfer in Tandem Reaction

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