Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation.
Debasish ChakrabortyChristian Danvad DamsgaardHugo SilvaChristian ConradsenJakob Lind OlsenHudson W P CarvalhoBenjamin MutzThomas BligaardMax J HoffmannJan-Dierk GrunwaldtFelix StudtIb ChorkendorfPublished in: Angewandte Chemie (International ed. in English) (2017)
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.
Keyphrases
- metal organic framework
- room temperature
- ionic liquid
- highly efficient
- aqueous solution
- visible light
- reduced graphene oxide
- carbon dioxide
- high resolution
- energy transfer
- hydrogen peroxide
- gold nanoparticles
- magnetic resonance imaging
- magnetic resonance
- computed tomography
- mass spectrometry
- single molecule
- anaerobic digestion
- drug delivery
- health risk
- oxide nanoparticles