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Bottom‐Up Design of a Copper–Ruthenium Nanoparticulate Catalyst for Low‐Temperature Ammonia Oxidation
Author(s) -
Chakraborty Debasish,
Damsgaard Christian Danvad,
Silva Hugo,
Conradsen Christian,
Olsen Jakob Lind,
Carvalho Hudson W. P.,
Mutz Benjamin,
Bligaard Thomas,
Hoffmann Max J.,
Grunwaldt JanDierk,
Studt Felix,
Chorkendorff Ib
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201703468
Subject(s) - catalysis , ruthenium , copper , monolayer , adsorption , inorganic chemistry , stoichiometry , ammonia , chemistry , ammonia production , chemical engineering , materials science , nanotechnology , organic chemistry , engineering
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.