| Literature DB >> 30517769 |
Bo Huang1, Hirokazu Kobayashi1,2, Tomokazu Yamamoto3,4, Takaaki Toriyama4, Syo Matsumura3,4,5, Yoshihide Nishida6, Katsutoshi Sato6,7, Katsutoshi Nagaoka6, Masaaki Haneda8,9, Wei Xie5, Yusuke Nanba5,10, Michihisa Koyama5,10, Fenglong Wang1,11, Shogo Kawaguchi12, Yoshiki Kubota13, Hiroshi Kitagawa1,5,14.
Abstract
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 Cux Ru1-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.Entities:
Keywords: CO oxidation; copper; heterogeneous catalysis; ruthenium; solid-solution alloys
Year: 2018 PMID： 30517769 DOI： 10.1002/anie.201812325
Source DB: PubMed Journal: Angew Chem Int Ed Engl ISSN： 1433-7851 Impact factor: 15.336