Layered double hydroxides derived Nix(MgyAlzOn) catalysts: Enhanced ammonia decomposition by hydrogen spillover effect

Qin Su, Linli Gu, Yao Yao, Jing Zhao, Weijie Ji*, Weiping Ding, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The NiMgAl-layered double hydroxides, with the stoichiometric ratios of Mg/Ni and Mg/Al being 0–9 and 0–3, respectively, were synthesized and employed as the Ni catalyst precursors for NH3 decomposition. The resulting catalyst of the certain Ni, Mg, and Al contents showed high catalytic efficiency and outstanding durability for the target reaction. The features of cost effective (with only Mg and Al elements besides Ni), easy fabrication, and thermally durable are attractive for large-scale operation. The characterizations revealed the related changes in structure and property, such as the Ni particle size and distribution, the reduction of Ni2+ species, the Ni-oxide matrix interaction, the surface basicity as well as the adsorption/desorption behavior of hydrogen, in line with the stoichiometry of Ni, Mg, and Al in the samples. The superior catalytic activity and stability are thought to be associated with the structurally isolated active Ni species by the oxide matrix and the synergism between Ni-Mg sites. Particularly, the “spillover effect” of surface hydrogen accounts for a higher turnover frequency.

Original languageEnglish
Pages (from-to)451-460
Number of pages10
JournalApplied Catalysis B: Environmental
Volume201
DOIs
Publication statusPublished - 1 Feb 2017

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Ammonia
  • Decomposition
  • Hydrogen spillover
  • Layered double hydroxide
  • Ni-based catalyst

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