Enhanced catalytic reduction of N-nitrosodimethylamine over bimetallic Pd-Ni catalysts

Huan Chen, Ting Li, Fang Jiang, Zhe Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

Catalytic reduction of N-nitrosodimethylamine (NDMA) was investigated over γ-Al2O3supported bimetallic Pd-Ni catalysts (3%(PdxNi1-x)). NDMA could be reduced to dimethylamine over 3%(Pd0.8Ni0.2) with a metal-loading-normalized pseudo-first-order rate constant of 836 ± 21 L gme-1h-1. Characterization results showed that the reducibility of PdO (or NiO) was improved by addition of Ni (or Pd) in 3%(PdxNi1-x); Pd-Ni ensembles were formed in 3%(PdxNi1-x) and there was an electronic transfer from Pd to Ni; metal dispersion was affected by the formation of Pd-Ni ensembles and a volcano curve of metal dispersion via Pd/Ni ratio was observed. The activity profiles demonstrated that TOF had a significant positive relationship with metal dispersion of 3%(PdxNi1-x), indicating high metal dispersion favor NDMA reduction. NDMA reduction over 3%(Pd0.8Ni0.2) catalyst could be described by Langmuir-Hinshelwood model, reflecting an adsorption controlled reduction mechanism. The reduction mechanism of NDMA over 3%(Pd0.8Ni0.2) catalyst was proposed to be that H2was activated by Pd, and H spillover from Pd to Ni/NiO reduced NDMA though N-N cleavage.
Original languageEnglish
Pages (from-to)167-177
Number of pages11
JournalJournal of Molecular Catalysis A: Chemical
Volume421
DOIs
Publication statusPublished - 1 Sep 2016

Keywords

  • Catalytic reduction
  • Metal dispersion
  • N-Nitrosodimethylamine (NDMA)
  • γ-Al O supported bimetallic Pd-Ni catalysts 2 3

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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