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A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity
Author(s) -
Huang Bo,
Kobayashi Hirokazu,
Yamamoto Tomokazu,
Toriyama Takaaki,
Matsumura Syo,
Nishida Yoshihide,
Sato Katsutoshi,
Nagaoka Katsutoshi,
Haneda Masaaki,
Xie Wei,
Nanba Yusuke,
Koyama Michihisa,
Wang Fenglong,
Kawaguchi Shogo,
Kubota Yoshiki,
Kitagawa Hiroshi
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201812325
Subject(s) - ruthenium , catalysis , carbon monoxide , copper , nanoparticle , adsorption , transition metal , alloy , inorganic chemistry , fourier transform infrared spectroscopy , metal , materials science , chemistry , chemical engineering , nanotechnology , metallurgy , organic chemistry , engineering
Ru is an important catalyst in many types of reactions. Specifically, Ru is well known as the best monometallic catalyst for oxidation of carbon monoxide (CO) and has been practically used in residential fuel cell systems. However, Ru is a minor metal, and the supply risk often causes violent fluctuations in the price of Ru. Performance‐improved and cost‐reduced solid‐solution alloy nanoparticles of the Cu‐Ru system for CO oxidation are now presented. Over the whole composition range, all of the Cu x Ru 1− x nanoparticles exhibit significantly enhanced CO oxidation activities, even at 70 at % of inexpensive Cu, compared to Ru nanoparticles. Only 5 at % replacement of Ru with Cu provided much better CO oxidation activity, and the maximum activity was achieved by 20 at % replacement of Ru by Cu. The origin of the high catalytic performance was found as CO site change by Cu substitution, which was investigated using in situ Fourier transform infrared spectra and theoretical calculations.