Surfactant mediated nanoparticle assembly of catalytic mesoporous crystalline iron oxide materials

Zhong Yong Yuan, Tie Zhen Ren, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

Abstract

The first examples of a new mesoporous form of crystalline β-FeOOH (akaganeite) were prepared by the surfactant-assisted method of nanoparticle assembly using FeCl3 as the precursor and a surfactant of either cationic cetylpyridinium or anionic dodecylsulfonate or nonionic Brij 56 as a hierarchical structure mediator. TEM images indicated the presence of a scaffold-like structure formed through the aggregation and intergrowth of rod-like akaganeite nanoparticles. The synthesized mesoporous akaganeite has a unimodal and very narrow pore size distribution with high surface area, which can be converted to mesostructured α-Fe2O3 (hematite) after degassing at 300°C. Bimodal pore size distributions could be obtained by increasing the synthetic temperature from 40 to 80°C. Mesoporous iron oxides with bicrystalline structure of akaganeite and hydronium jarosite were prepared when using dodecylsulfonate surfactant at 80°C. The surfactants were believed to play an important role in the formation of the hierarchical scaffold-like mesostructure.

Original languageEnglish
Pages (from-to)743-750
Number of pages8
JournalCatalysis Today
Volume93-95
DOIs
Publication statusPublished - 1 Sep 2004
EventSelections from the Presentations of the 3rd Asia-Pacific Congress - Dalian, China
Duration: 12 Oct 200312 Oct 2003

Keywords

  • Akaganeite
  • Iron oxide
  • Mesoporous structure
  • Nanoparticle assembly
  • Surfactant templating

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