Preparation of mesoporous CeO2 and monodispersed NiO particles in CeO2, and enhanced selectivity of NiO/CeO2 for reverse water gas shift reaction

Baowang Lu, Katsuya Kawamoto

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

The preparation of mesoporous ceria (CeO2) and NiO/CeO 2 was investigated using a simple calcination method. Though the oxidation of Ce3+ ions, the hydrolysis of Ce4+ ions, polymerization and precipitation in melted liquid, the nanosized mesoporous CeO2 and NiO/CeO2 could be obtained after calcination. The mesoporous CeO2 and NiO/CeO2 that were obtained had high surface areas, narrow pore size distributions and uniform mesopores. The mesoporous CeO2 had very high thermal stability and a surface area of 100 m2 g-1 even after calcination at 600 C. The mesoporous CeO2 and NiO/CeO2 had nanoarrays with uniform mesopores (intercrystalline voids). The reverse water gas shift reaction was studied using mesoporous NiO/CeO2 as a catalyst. The CO2 conversion increased with increasing temperature and NiO amount. With less than 3 wt% NiO, NiO particles were monodispersed in mesoporous CeO2, and provided a CO selectivity of 100%, regardless of temperature. These monodispersed NiO particles in mesoporous CeO2 were observed for the first time. NiO particles that aggregated in the presence of more than 3.5 wt% NiO, resulted in a CO selectivity of 100% at temperatures above 700 C, whereas the CO selectivity is less than 100% at temperatures below 650 C. Therefore, the mondispersion of NiO particles in mesoporous CeO2 enhanced CO selectivity.

Original languageEnglish
Pages (from-to)70-78
Number of pages9
JournalMaterials Research Bulletin
Volume53
DOIs
Publication statusPublished - May 2014
Externally publishedYes

Keywords

  • A. Inorganic compounds
  • A. Oxides
  • B. Chemical synthesis
  • C. Thermogravimetric analysis
  • C. X-ray diffraction
  • D. Catalytic properties
  • D. Surface properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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