Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2019 Aug 5;10(36):8292-8298.
doi: 10.1039/c9sc03172c. eCollection 2019 Sep 28.

A Cu-Pd Single-Atom Alloy Catalyst for Highly Efficient NO Reduction

Free PMC article

A Cu-Pd Single-Atom Alloy Catalyst for Highly Efficient NO Reduction

Feilong Xing et al. Chem Sci. .
Free PMC article


A series of Cu-Pd alloy nanoparticles supported on Al2O3 were prepared and tested as catalysts for deNO x reactions. XRD, HAADF-STEM, XAFS, and FT-IR analyses revealed that a single-atom alloy structure was formed when the Cu/Pd ratio was 5, where Pd atoms were well isolated by Cu atoms. Compared with Pd/Al2O3, Cu5Pd/Al2O3 exhibited outstanding catalytic activity and N2 selectivity in the reduction of NO by CO: for the first time, the complete conversion of NO to N2 was achieved even at 175 °C, with long-term stability for at least 30 h. High catalytic performance was also obtained in the presence of O2 and C3H6 (model exhaust gas), where a 90% decrease in Pd use was achieved with minimum evolution of N2O. Kinetic and DFT studies demonstrated that N-O bond breaking of the (NO)2 dimer was the rate-determining step and was kinetically promoted by the isolated Pd.


Fig. 1
Fig. 1. (a) HAADF-STEM image of Cu5Pd/Al2O3 and (b) size distribution of the nanoparticles. (c) Elemental map of the Pd + Cu overlayer, as acquired by EDS. (d) High-resolution image of a single nanoparticle.
Fig. 2
Fig. 2. (a) FT-IR spectra of CO adsorbed on the prepared catalysts. (b) Fourier transforms of the Pd K-edge EXAFS spectra of the Pd-based catalysts.
Fig. 3
Fig. 3. (a) NO conversion to N2 during the NO reduction by CO over Pd, Cu, and Cu–Pd catalysts as a function of reaction temperature (NO, CO: 0.5%, GHSV = 80 000 h–1). (b) Comparison between CN2 and CN2O in NO reduction in the presence of O2 and C3H6. (c) Stability test for Cu5Pd/Al2O3 in the NO + CO reaction at low temperatures (NO, CO: 0.5%, GHSV = 40 000 h–1).
Fig. 4
Fig. 4. Arrhenius-type plots obtained in the NO + CO reaction over Cu5Pd/Al2O3, Cu/Al2O3, and Pd/Al2O3 catalysts.
Fig. 5
Fig. 5. Energy diagrams of NO adsorption, dimerization, and the dimer's decomposition over pure and Pd-doped Cu(211) surfaces. The total energy of the slab and free NO was set to zero.
Fig. 6
Fig. 6. Energy diagrams of N2O bending (initial (IS) to intermediate (MS) states) and its subsequent decomposition to N2 and O (MS to final state (FS)) over the Cu(211) surface. The total energy of slab and free N2O was set to zero.

Similar articles

See all similar articles


    1. Pacher P., Beckman J. S., Liaudet L. Physiol. Rev. 2007;87:315–424. - PMC - PubMed
    1. Berks B. C., Ferguson S. J., Moir J. W. B., Richardson D. J. Biochim. Biophys. Acta, Bioenerg. 1995;1232:97–173. - PubMed
    1. Rezaei F., Rownaghi A. A., Monjezi S., Lively R. P., Jones C. W. Energy Fuels. 2015;29:5467–5486.
    1. Monn C. Atmos. Environ. 2001;35:1–32.
    1. Wang J. H., Chen H., Hu Z. C., Yao M. F., Li Y. D. Catal. Rev. 2015;57:79–144.