Design of a carbon-resistant Ni@S-2 reforming catalyst: Controllable Ni nanoparticles sandwiched in a peasecod-like structure

Wang, Jing; Fu, Yu; Kong, Wei; Jin, Fuqiang; Bai, Jianghao; Zhang, Jun; Sun, Yuhan

doi:10.1016/j.apcatb.2020.119546

Cited by 66 publications

(31 citation statements)

References 49 publications

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“…Kinetic analysis was carried out under another extremely high GHSV of 1440 L g cat –1 h –1 , at which the traditional diffusions from large granule stacking had been already excluded from both the experimental and the theoretical results; thus, we could safely infer the effects of the nanoreactor shell diffusion on the reaction rates from the micro–nano perspective. As shown in Figure e, the CH 4 and CO 2 reaction rates, namely, r CH4 and r CO2 , of NSNC-T10 are much higher than those of the other two counterparts, clarifing the opimized shell structure in overcoming the shell diffusion effects.…”

Section: Resultsmentioning

confidence: 99%

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Wang

Jie

et al. 2021

ACS Appl. Mater. Interfaces

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Well-geometric-confined yolk−shell catalysts can act as nanoreactors that are of benefit for the antisintering of metals and resistance to coke formation in high-temperature reactions such as the CO 2 reforming of methane. Notwithstanding the credible advances of core/yolk−shell catalysts, the enlarged shell diffusion effects that occur under high space velocity can deactivate the catalysts and hence pose a hurdle for the potential application of these types of catalysts. Here, we demonstrated the importance of the shell thickness and porosity of small-sized Ni@SiO 2 nanoreactor catalysts, which can vary the diffusional paths/rates of the diffusants that directly affect the catalytic activity. The nanoreactor with an ∼4.5 nm shell thickness and rich pores performed the best in tolerating the shell diffusion effects, and importantly, no catalytic deactivation was observed. We further proposed a shell diffusion effect scheme by modifying the Weisz−Prater and blocker model and found that the "gas wall/hard blocker" formed on the openings of the shell pores can cause reversible/irreversible interruption of the shell mass transfer and thus temporarily/permanently deactivate the nanoreactor catalysts. This work highlights the shell diffusion effects, apart from the metal sintering and coke formation, as an important factor that are ascribed to the deactivation of a nanoreactor catalyst. KEYWORDS: core/yolk−shell, nanoreactor, nanocapsule, shell diffusion effect, CO 2 reforming of methane

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Section: Resultsmentioning

confidence: 99%

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Wang

Jie

et al. 2021

ACS Appl. Mater. Interfaces

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“…In order to reduce coke formation and improve catalyst stability/activity, numerous strategies involving modification in the catalyst surface composition and metalsupport interaction have been attempted. 219,220,222,[356][357][358][359][360][361][362][363][364][365][366][367][368] To develop a coke-resistant catalyst, approaches based on selective blockage of the defect sites of the active metal (e.g., Ni) nanoparticles by the use of inert elements such as S, 330 Sn, 369 Au, 370 and K (ref. 234 and 371) were attempted.…”

Section: Catalysis Science and Technologymentioning

confidence: 99%

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Alam

Cheula

Moroni

et al. 2021

Catal. Sci. Technol.

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“…For the photoelectron spectra of the reduced catalyst samples in Figure 6B , the Ni/SiO 2 -IM and Ni/SiO 2 -SG samples exhibited two peaks at 852.4 and 855.5 eV, which was assigned to metallic nickel and aggregated nickel oxide, respectively ( Liu et al, 2019 ). Interestingly, the Ni/SiO 2 -AE sample exhibited a weaker characteristic peak of metallic nickel at 852.45 eV and a stronger characteristic peak of Ni-O-Si at 855.5 eV ( Lehmann et al, 2012 ; Wang J. Y et al, 2021 ). This indicated that there were abundant Ni-O-Si units on the surface of the reduced Ni/SiO 2 -AE catalyst, and this result was consistent with the XRD.…”

Section: Resultsmentioning

confidence: 99%

Impact of preparation method on nickel speciation and methane dry reforming performance of Ni/SiO2 catalysts

et al. 2022

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The methane dry reforming reaction can simultaneously convert two greenhouse gases (CH4 and CO2), which has significantly environmental and economic benefits. Nickel-based catalysts have been widely used in methane dry reforming in past decade due to their low cost and high activity. However, the sintering and coke deposition of catalysts severely limit their industrial applications. In this paper, three Ni/SiO2 catalysts prepared by different methods were systematically studied, and the samples obtained by the ammonia evaporation method exhibited excellent catalytic performance. The characterization results such as H2-TPR, XPS and TEM confirmed that the excellent performance was mainly attributed to the catalyst with smaller Ni particles, stronger metal-support interactions, and abundant Ni-O-Si units on the catalyst surface. The anti-sintering/-coking properties of the catalyst were significantly improved. However, the Ni/SiO2-IM catalyst prepared by impregnation method had uneven distribution of nickel species and large particles, and weak metal-support interactions, showing poor catalytic performance in methane dry reforming. Since the nickel species were encapsulated by the SiO4 tetrahedral network, the Ni/SiO2-SG catalyst prepared by sol-gel method could not expose more effective active sites even if the nickel species were uniformly dispersed, resulting in poor dry reforming performance. This study provides guidance for the preparation of novel anti-sintering/-coking nickel-based catalysts.

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Design of a carbon-resistant Ni@S-2 reforming catalyst: Controllable Ni nanoparticles sandwiched in a peasecod-like structure

Cited by 66 publications

References 49 publications

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products

Impact of preparation method on nickel speciation and methane dry reforming performance of Ni/SiO2 catalysts

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Design of a carbon-resistant Ni@S-2 reforming catalyst: Controllable Ni nanoparticles sandwiched in a peasecod-like structure

Cited by 66 publications

References 49 publications

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO2 Reforming of Methane

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO2 Reforming of Methane

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

Impact of preparation method on nickel speciation and methane dry reforming performance of Ni/SiO2 catalysts

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Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Yolk–Shell Nanocapsule Catalysts as Nanoreactors with Various Shell Structures and Their Diffusion Effect on the CO₂ Reforming of Methane

Mechanistic and multiscale aspects of thermo-catalytic CO₂conversion to C₁products