Towards a full understanding of the nature of Ni(<scp>ii</scp>) species and hydroxyl groups over highly siliceous HZSM-5 zeolite supported nickel catalysts prepared by a deposition–precipitation method

Chen, Baohui; Chao, Zi‐Sheng; He, Huan; Huang, Chen; Liu, Yajuan; Yi, Wen-Jun; Wei, Xueling; An, Jun-Fang

doi:10.1039/c4dt00399c

Cited by 57 publications

(18 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are two possible interpretations of these peaks. First, these peaks can be attributed to the presence of nickel phyllosilicate species, as was suggested previously [37, 39,40]. Generally, nickel phyllosilicate is not observed by XRD probably due to its very high dispersion.…”

Section: Catalyst Characterizationsupporting

confidence: 56%

Nickel–zeolite composite catalysts with metal nanoparticles selectively encapsulated in the zeolite micropores

et al. 2019

View full text Add to dashboard Cite

Metal zeolite composite catalysts have found numerous applications in adsorption, gas separation, petroleum refining and chemical industry. The key issue in the design of these catalysts is the localization of the metal within the zeolite structure. This paper focuses on a new approach to the synthesis of nickel-zeolite composite catalysts selectively containing metal nanoparticles inside the zeolite pores. In the catalysts prepared by conventional impregnation, metal particles from the external surface of the zeolites were selectively removed by extraction with bulky polymer molecules of poly-4-styrenesulfonic acid. The method is particularly suitable for the ZSM-5 zeolite with relatively narrow micropores. The nickel zeolite catalysts were tested in hydrogenation of toluene and 1,3,5-tri-isopropyl benzene (TIPB). The removal of nickel particles from the zeolite external surface leads to a considerable decrease in the hydrogenation rate of the bulky TIPB molecules, while toluene hydrogenation was affected to a much lesser extent and was almost proportional to the nickel content. The proposed methodology can be extended to other types of microporous catalysts.

show abstract

Section: Catalyst Characterizationsupporting

confidence: 56%

Nickel–zeolite composite catalysts with metal nanoparticles selectively encapsulated in the zeolite micropores

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For calcined samples the micropore volume slightly decreases with nickel loading, while mesopore volume increases; thus indicating that micropores are being blocked by the nickel particles, and that the nickel species present after calcination lead to the formation of additional mesopores. This phenomenon was described by Chen et al who related the presence of defects in the HZSM-5 with the formation of nickel phyllosilicates and attributed the development of mesopores to the aggregation of these defects [14]. After reduction, Ni 2+ species are reduced to Ni metal and the trends are no longer evident.…”

Section: Textural Propertiesmentioning

confidence: 74%

“…More recent studies have characterized the nickel phyllosilicate species [12,13]. In a recent work by Chen et al [14], they have confirmed the existence of and characterized nickel hydroxide, nickel oxide, and 1:1 and 2:1 nickel phyllosilicate species present in Ni/HZSM-5 catalyst prepared by depositionprecipitation.…”

Section: Introductionmentioning

confidence: 88%

“…The increase in acid strength with increasing nickel loading ( Table 3) can be ascribed to the introduction of more Lewis acid sites on the support due to the increase of Ni 2+ loaded on the support, since the nickel cations can act as electron-acceptors [14]. The significant increase in acid strength from the calcined catalysts to the reduced and passivated catalysts can be attributed to a combination of factors.…”

Section: Acid Strengthmentioning

confidence: 96%

See 1 more Smart Citation

Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 1. Effect of nickel loading and preparation conditions on catalyst properties

Barton

Carrier

Segura

et al. 2017

Applied Catalysis A: General

View full text Add to dashboard Cite

Nickel metal supported on HZSM-5 (zeolite) is a promising catalyst for lignin depolymerization. In this work, Ni/HZSM-5 catalysts were synthesized via depositionprecipitation (DP) and characterized. The effect of synthesis parameters; including nickel loading, DP time (synthesis contact time), and calcination temperature, on catalyst properties were studied. N 2 and CO 2 adsorption techniques were used to look at textural properties and confirmed the existence of lamellar species generated from DP. X-ray diffraction (XRD) confirmed that nickel metal was present on the support after reduction and passivation of the catalyst. Temperature programmed reduction showed that all the catalyst preparations were reducible at 733 K after 4 h, and that the DP method formed a mixture of Ni 2+ species on the support. Transmission electron microscopy, XRD, and H 2 chemisorption were used to determine approximate particle size and dispersion of nickel metal. From all the preparations, the 15 wt% Ni/HZSM-5 catalyst with long DP time (16 h) and low calcination temperature (673 K), exhibited the most favorable particle size (~5 nm) and dispersion (7%).

show abstract

“…The absence of peaks for NiPS is probably because of the low crystallinity of NiPS. It has been reported that the crystal structure of NiPS is easily affected by the preparation and calcination environment . Previously, it was shown to be common that NiPS prepared by the same ammonia evaporation method showed different XRD patterns .…”

Section: Resultsmentioning

confidence: 99%

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

2017

View full text Add to dashboard Cite

We synthesize a new sandwich‐like silica@Ni@silica multicore–shell catalyst. Firstly, Ni phyllosilicate (NiPS) is supported on silica nanospheres by a simple ammonia evaporation method. Then NiPS is coated with a layer of mesoporous silica to obtain a core–shell NiPS@silica structure by the hydrolysis of tetraethylorthosilicate (TEOS). The thickness of the shell can be tuned by varying the amount of TEOS. After calcination and H2 reduction at high temperature, multiple small Ni nanoparticles (≈6 nm) are generated and supported on the inner silica core but also encapsulated within the outer mesoporous silica shell. This silica@Ni@silica multicore–shell catalyst shows a high and stable conversion (≈60 %, gas hourly space velocity=60 000 mL h−1 gcat−1) for the dry reforming of methane (DRM) at 600 °C, whereas pristine NiPS deactivates quickly because of heavy carbon formation. We investigated the spent catalysts by using thermogravimetric analysis and TEM and found that there is almost no carbon formation for this new multicore–shell catalyst. Compared with a conventional Ni@silica core–shell catalyst, our multicore–shell catalyst is much easier to synthesize and the process does not require any toxic organic solvents. We believe that this strategy to make a multicore–shell catalyst can be applied to more nanomaterials and extended to other catalytic reactions besides DRM.

show abstract

Towards a full understanding of the nature of Ni(ii) species and hydroxyl groups over highly siliceous HZSM-5 zeolite supported nickel catalysts prepared by a deposition–precipitation method

Cited by 57 publications

References 82 publications

Nickel–zeolite composite catalysts with metal nanoparticles selectively encapsulated in the zeolite micropores

Nickel–zeolite composite catalysts with metal nanoparticles selectively encapsulated in the zeolite micropores

Ni/HZSM-5 catalyst preparation by deposition-precipitation. Part 1. Effect of nickel loading and preparation conditions on catalyst properties

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

Contact Info

Product

Resources

About