Resettable Heterogeneous Catalyst: (Re)Generation and (Re)Adsorption of Ni Nanoparticles for Repeated Synthesis of Carbon Nanotubes on Ni-Al-O Thin Films

Bin Liang, Eongyu Yi, Toshihiro Sato, Suguru Noda, Kai Sun, Dechang Jia, Yu Zhou, Richard M. Laine

Research output: Contribution to journalArticle

Abstract

Liquid-feed flame spray pyrolysis (LF-FSP) of selected metalloorganics provides [NiO]0.25[Al2O3]0.75 and [NiO]0.5[Al2O3]0.5 spinel nanopowders (NPs) without aggregation and with good stoichiometric control. Both compositions were processed to thin films as a first step in preparing Ni:Al2O3 nanocomposite films for catalytic synthesis of CNTs. NPs dispersed in polymer were cast giving 30 ± 10 μm green films that were debindered (370 °C), sintered at 1000-1500 °C/air, and then heated at 1000-1100 °C in H2/N2 5:95 to generate Ni particles as catalyst sites. These Ni particles promote the growth of CNTs. The CNTs were then oxidatively removed coincident with regeneration of the [NiO]1-x[Al2O3]x surfaces. Thereafter, reduction, CNT syntheses, and catalyst regeneration were repeated two times more. The quality and quantity of CNTs were the same after each cycle. This represents what we believe is a new, general approach to catalyst recycling/regeneration.

Original languageEnglish
Pages (from-to)5483-5492
Number of pages10
JournalACS Applied Nano Materials
Volume1
Issue number10
DOIs
Publication statusPublished - 2018 Oct 26

Keywords

  • carbon nanotubes
  • flexible
  • metal-ceramic composites
  • nickel aluminate spinel
  • regenerable catalyst
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)

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