Stabilization of catalytically active Cu⁺ surface sites on titanium-copper mixed-oxide films.
The oxidation of CO is the archetypal heterogeneous catalytic reaction and plays a central role in the advancement of fundamental studies, the control of automobile emissions, and industrial oxidation reactions. Copper-based catalysts were the first catalysts that were reported to enable the oxidation of CO at room temperature, but a lack of stability at the elevated reaction temperatures that are used in automobile catalytic converters, in particular the loss of the most reactive Cu(+) cations, leads to their deactivation. Using a combined experimental and theoretical approach, it is shown how the incorporation of titanium cations in a Cu2O film leads to the formation of a stable mixed-metal oxide with a Cu(+) terminated surface that is highly active for CO oxidation.
Chemistry Department, Brookhaven National Laboratory (BNL), Upton, NY 11973 (USA).
Ashleigh E
AE
Baber
Xiaofang
X
Yang
Hyun You
HY
Kim
Kumudu
K
Mudiyanselage
Markus
M
Soldemo
Jonas
J
Weissenrieder
Sanjaya D
SD
Senanayake
Abdullah
A
Al-Mahboob
Jerzy T
JT
Sadowski
Jaime
J
Evans
José A
JA
Rodriguez
Ping
P
Liu
Friedrich M
FM
Hoffmann
Jingguang G
JG
Chen
Darío J
DJ
Stacchiola
CO oxidation; IR spectroscopy; mixed oxides; scanning tunneling microscopy; surface chemistry