Preparation of monodispersed NiO particles in SBA-15, and its enhanced selectivity for reverse water gas shift reaction

Baowang Lu, Katsuya Kawamoto

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The preparation of monodispersed NiO particles in SBA-15 using the direct hydrothermal synthesis method with various combinations of metallic salt precursors and acids was investigated in detail. With NiO/SBA-15 containing less than 1 wt% NiO, the NiO particles were monodispersed in the SBA-15 framework using the HCl + Ni(NO3)2 combination, whereas when the NiO amount exceeded 2 wt%, the NiO particles aggregated. However, with NiO/SBA-15 containing less than 25 wt% NiO, the NiO particles were monodispersed in the SBA-15 framework using the HCl + NiSO4 combination, whereas when the NiO amount exceeded 30 wt%, the NiO particles aggregated. In addition, the reverse water gas shift (RWGS) reaction was studied using NiO/SBA-15 obtained by different combinations. Regardless of the combination and temperature, the CO selectivity was 100% using monodispersed NiO particles. In the presence of aggregated NiO particles, the CO selectivity was 100% only at high temperature; by contrast, the CO selectivity was less than 100% at low temperature. To achieve high CO2 conversion and 100% CO selectivity, the HCl + Ni(NO3)2 combination was not desired due to small metal loading, whereas the HCl + NiSO4 combination was necessary owing to large metal loading. Moreover, NiO/SBA-15 had relatively high thermal stability.

Original languageEnglish
Pages (from-to)300-309
Number of pages10
JournalJournal of Environmental Chemical Engineering
Volume1
Issue number3
DOIs
Publication statusPublished - Sep 1 2013
Externally publishedYes

Keywords

  • Combination Carbon dioxide
  • Mesoporous
  • Monodispersion
  • Nickel oxides particles
  • Reverse water gas shift reaction

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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