Hydrothermal synthesis of CuV2O6 supported on mesoporous SiO2 as SO3 decomposition catalysts for solar thermochemical hydrogen production

Takahiro Kawada, Hiroaki Yamashita, Qingxin Zheng, Masato Machida

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Hydrothermal synthesis of CuV2O6 supported on 3-D ordered mesoporous SiO2 (CuV/SiO2) was studied to evaluate the catalytic activity for SO3 decomposition, which is a key step in solar thermochemical hydrogen production. A composite oxide hydrate, Cu3O(V2O7)·H2O, and an oxide hydroxide hydrate, Cu3(OH)2V2O7·(H2O)2, were formed at lower hydrothermal temperatures (≤200 ). The oxide hydrate phase mainly yielded Cu after calcination at 600 in air. By contrast, the hydrothermal synthesis at 250 (CuV/SiO250) directly crystallized CuV from the oxide hydroxide hydrate, although its very large particle size (∼5 μm) is not suitable for the catalytic application. The SO decomposition activity measured at 600 was associated with the yield as well as the dispersion of CuV, giving rise to the maximum for the hydrothermal synthesis at 200 CuV/SiO250 achieved the highest catalytic activity at the reaction temperature of 650, because the melting phase of CuV penetrated mesoporous SiO and thus improved the dispersion of the active phase.

Original languageEnglish
Pages (from-to)20646-20651
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number35
DOIs
Publication statusPublished - 2014 Dec 3
Externally publishedYes

Keywords

  • Copper vanadate
  • Hydrothermal synthesis
  • SO decomposition
  • Solar hydrogen

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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