Issue 3, 2015

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

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.

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

Article information

Article type
Paper
Submitted
06 Oct 2014
Accepted
28 Nov 2014
First published
28 Nov 2014

Catal. Sci. Technol., 2015,5, 1588-1597

Author version available

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

Z. Xu, N. Wang, W. Chu, J. Deng and S. Luo, Catal. Sci. Technol., 2015, 5, 1588 DOI: 10.1039/C4CY01302F

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