In situ controllable assembly of layered-double-hydroxide-based nickel nanocatalysts for carbon dioxide reforming of methane

Xu, Zhenxin, Wang, Ning, Chu, Wei, Deng, Jie and Luo, Shizhong (2015) In situ controllable assembly of layered-double-hydroxide-based nickel nanocatalysts for carbon dioxide reforming of methane. Catalysis Science and Technology, 5 3: 1588-1597. doi:10.1039/c4cy01302f


Author Xu, Zhenxin
Wang, Ning
Chu, Wei
Deng, Jie
Luo, Shizhong
Title In situ controllable assembly of layered-double-hydroxide-based nickel nanocatalysts for carbon dioxide reforming of methane
Formatted title
In situ controllable assembly of layered-double-hydroxide-based nickel nanocatalysts for carbon dioxide reforming of methane
Journal name Catalysis Science and Technology   Check publisher's open access policy
ISSN 2044-4761
2044-4753
Publication date 2015-03-01
Year available 2014
Sub-type Article (original research)
DOI 10.1039/c4cy01302f
Open Access Status DOI
Volume 5
Issue 3
Start page 1588
End page 1597
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher RSC Publications
Language eng
Subject 1503 Catalysis
Abstract Producing loaded metal nano-cluster catalysts possessing at the same time enhanced reactivity and durability has become increasingly important, but still remains a tremendous challenge in nanoparticle hetero-catalysis. In our current study, Mg-functionalized Ni-based nanohybrids with both a large dispersion and small size of nickel particles as well as excellent anti-sintering imbedded in a hierarchical mesostructured γ-AlO substrate were successfully developed using an easy and reproducible procedure. This procedure involved an in situ growth mechanism of Ni-containing layered double hydroxides (LDHs) that used alumina substrates as the sole Al source. The developed nanohybrid shows both exceptional reactivity and durability for carbon dioxide reforming of methane. A combination of techniques, including XRD, N adsorption and desorption, FT-IR, TGA, SEM, ICP-AES, XPS, H-TPR, CO-TPD, TEM, and in situ CH/CO-TPSR, was used to determine a strong structure-function relationship for the catalyst. The highly reducible and dispersed active surface Ni species greatly enhanced the activation of methane, while fine tuning the acidity/basicity of the surface supplied sufficient reactive centers for the adsorption/activation of CO. In addition, the reciprocally strengthened dual confinement effects imparted by both the mesoporous γ-AlO matrix and the in situ-grown LDH precursors resulted in the extraordinary catalytic stability, without pronounced sintering and/or agglomeration of reactive phases in the demanding working conditions.
Formatted abstract
Producing loaded metal nano-cluster catalysts possessing at the same time enhanced reactivity and durability has become increasingly important, but still remains a tremendous challenge in nanoparticle hetero-catalysis. In our current study, Mg-functionalized Ni-based nanohybrids with both a large dispersion and small size of nickel particles as well as excellent anti-sintering imbedded in a hierarchical mesostructured γ-Al2O3 substrate were successfully developed using an easy and reproducible procedure. This procedure involved an in situ growth mechanism of Ni-containing layered double hydroxides (LDHs) that used alumina substrates as the sole Al3+ source. The developed nanohybrid shows both exceptional reactivity and durability for carbon dioxide reforming of methane. A combination of techniques, including XRD, N2 adsorption and desorption, FT-IR, TGA, SEM, ICP-AES, XPS, H2-TPR, CO2-TPD, TEM, and in situ CH4/CO2-TPSR, was used to determine a strong structure–function relationship for the catalyst. The highly reducible and dispersed active surface Ni species greatly enhanced the activation of methane, while fine tuning the acidity/basicity of the surface supplied sufficient reactive centers for the adsorption/activation of CO2. In addition, the reciprocally strengthened dual confinement effects imparted by both the mesoporous γ-Al2O3 matrix and the in situ-grown LDH precursors resulted in the extraordinary catalytic stability, without pronounced sintering and/or agglomeration of reactive phases in the demanding working conditions.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 28 Nov 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2015 Collection
 
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