Formation of Cu nanoparticles in SBA-15 functionalized with carboxylic acid groups and their application in the water-gas shift reaction

Ching S. Chen, Yuan T. Lai, Tzu W. Lai, Jia H. Wu, Ching H. Chen, Jyh F. Lee, Hsien M. Kao

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

SBA-15 functionalized with carboxylic acid groups has been used to synthesize Cu nanoparticles 2-6 nm in average size with 7.6-25.2 wt % Cu. In this study, the formation mechanism and characterization of Cu nanoparticles at various Cu concentrations are described. For samples with 7.6 and 11.9 wt % Cu, linear [Cuδ+⋯Oδ-⋯Cu δ+]n chains generated through calcination are possibly located inside the SBA-15 channels. When the concentration of Cu is increased to 18.3 wt %, the Cu2(OH)3NO3 species becomes the dominant intermediate before bulky CuO is formed. It is found that the average 2-nm Cu particles provided a significantly higher turnover rate for water-gas shift (WGS) reaction than did higher Cu contents on SBA-15. We propose that the highly dispersed Cu particles or isolated Cu atoms on Cu/SBA-15 catalysts can serve as major active sites for the WGS reaction. The 7.6 and 11.9 wt % Cu/SBA-15 catalysts provide abundant sites on highly dispersed Cu particles or isolated Cu atoms, which lead to a highly efficient WGS reaction.

Original languageEnglish
Pages (from-to)667-677
Number of pages11
JournalACS Catalysis
Volume3
Issue number4
DOIs
StatePublished - 5 Apr 2013

Keywords

  • carboxylic acid
  • Cu nanoparticles
  • water-gas shift reaction

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