Hydrothermally synthesized CuxO as a catalyst for CO oxidation

Mu Yao Guo, Fangzhou Liu, Jenkin Tsui, Albert A. Voskanyan, Alan Man Ching Ng, Aleksandra B. Djurišić, Wai Kin Chan, Kwong Yu Chan, Changzhong Liao, Kaimin Shih, Charles Surya

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Abstract

Hydrothermally synthesized CuxO exhibited improved performance for CO oxidation compared to the hydrothermally synthesized Cu2O, as well as commercial CuO nanoparticles. Hydrothermally synthesized CuxO predominantly consists of CuO, but it also contains a small contribution from Cu2O, as well as Cu2(OH)3(NO3) (before annealing). After annealing, only CuO and Cu2O phases are present, and the T50 value is significantly improved from 179 °C to 149 °C, and the T50 value of annealed hydrothermal CuxO remains practically unchanged for 3 catalytic cycles. The improved performance of hydrothermal CuxO can be attributed to its composition and surface properties. The ratio of lattice oxygen to surface oxygen (oxygen in surface adsorbates, surface states, and defects) increases after the first CO oxidation reaction for all samples except commercial CuO nanoparticles, which exhibit steady decrease with increased cycling. In addition, pure Cu2O irreversibly changes to CuO after CO oxidation reaction, but its catalytic performance after the first cycle is significantly improved compared to commercial CuO nanoparticles.

Original languageEnglish
Pages (from-to)3627-3632
Number of pages6
JournalJournal of Materials Chemistry A
Volume3
Issue number7
DOIs
Publication statusPublished - Feb 21 2015
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Guo, M. Y., Liu, F., Tsui, J., Voskanyan, A. A., Ng, A. M. C., Djurišić, A. B., Chan, W. K., Chan, K. Y., Liao, C., Shih, K., & Surya, C. (2015). Hydrothermally synthesized CuxO as a catalyst for CO oxidation. Journal of Materials Chemistry A, 3(7), 3627-3632. https://doi.org/10.1039/c4ta06804a