Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation

Debasish Chakraborty , Christian Danvad Damsgaard, Hugo José Lopes Silva, Christian Nagstrup Conradsen, Jakob Lind Olsen, Hudson W. P. de Carvalho, Benjamin Mutz, Thomas Bligaard, Max J Hoffmann, Jan-Dierk Grunwaldt, Felix Studt, Ib Chorkendorff

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Abstract

A novel nanoparticulate catalyst of copper (Cu) and ruthenium (Ru) was designed for low-temperature ammonia oxidation at near-stoichiometric mixtures using a bottom-up approach. A synergistic effect of the two metals was found. An optimum CuRu catalyst presents a reaction rate threefold higher than that for Ru and forty-fold higher than that for Cu. X-ray absorption spectroscopy suggests that in the most active catalyst Cu forms one or two monolayer thick patches on Ru and the catalysts are less active once 3D Cu islands form. The good performance of the tuned Cu/Ru catalyst is attributed to changes in the electronic structure, and thus the altered adsorption properties of the surface Cu sites.
Original languageEnglish
JournalAngewandte Chemie International Edition
Volume56
Issue number30
Pages (from-to)8711-8715
Number of pages6
ISSN1433-7851
DOIs
Publication statusPublished - 2017

Keywords

  • X-ray absorption spectroscopy
  • Ammonia oxidation
  • Density functional calculations
  • Heterogeneous catalysis

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