Carbon dioxide hydrogenation on cu nanoparticles

Ching S. Chen, Jia H. Wu, Tzu W. Lai

Research output: Contribution to journalJournal Article peer-review

59 Scopus citations


The reaction mechanism and active sites for CO2adsorption during the reverse water-gas shift (RWGS) reaction on silica-supported Cu nanoparticles were investigated. The Cu nanoparticles prepared by an atomic layer epitaxy technique were shown to strongly bind CO2molecules, as evidenced by the two main peaks with maxima near 353 (α peak) and 525 K (βpeak) observed during temperature-programmed desorption experiments. The high-temperature peak (525 K), which corresponds to CO2in the βstate, indicates that β-state CO2was the dominant species for the RWGS reaction. The values for the activation energy of CO 2desorption were 33.4 and 74.4 kJ/mol for α-CO2and β-CO2, respectively. The sites for CO2adsorption were different from those for CO adsorption (defect sites and sites with highly dispersed Cu particles). It is likely that CO2hydrogenation occurs on a low-index plane. We propose that the mechanism for the RWGS reaction mainly involves formation of formate species.

Original languageEnglish
Pages (from-to)15021-15028
Number of pages8
JournalJournal of Physical Chemistry C
Issue number35
StatePublished - 09 09 2010


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