TY - JOUR
T1 - Temperature dependent CO oxidation mechanisms on size-selected clusters
AU - Kunz, Sebastian
AU - Schweinberger, Florian F.
AU - Habibpour, Vahideh
AU - Röttgen, Martin
AU - Harding, Christopher
AU - Arenz, Matthias
AU - Heiz, Ulrich
PY - 2010/1/28
Y1 - 2010/1/28
N2 - Using p-MBRS experiments and TPR as well as FTIR measurements, it could be shown that dissociative oxygen activation occurs in the same temperature range for small clusters in comparison to faceted nanoparticles (NPs) and Pd single crystals. Surprisingly, CO poisoning does not take place on small Pd clusters at temperatures above 300 K. Furthermore, an oxygen activation has been found in this low temperature range which differs from the normal dissociative activation since it occurs only if CO is already adsorbed, before O2 adsorbs. Hence, the reactivity is promoted by CO under these conditions. This is in contrast to the normal Langmuir-Hinshelwood mechanism which has previously been observed for single crystals and facted NPs. Cooperative effects in the adsorption of the reactants are most likely responsible for such unordinary behaviors.
AB - Using p-MBRS experiments and TPR as well as FTIR measurements, it could be shown that dissociative oxygen activation occurs in the same temperature range for small clusters in comparison to faceted nanoparticles (NPs) and Pd single crystals. Surprisingly, CO poisoning does not take place on small Pd clusters at temperatures above 300 K. Furthermore, an oxygen activation has been found in this low temperature range which differs from the normal dissociative activation since it occurs only if CO is already adsorbed, before O2 adsorbs. Hence, the reactivity is promoted by CO under these conditions. This is in contrast to the normal Langmuir-Hinshelwood mechanism which has previously been observed for single crystals and facted NPs. Cooperative effects in the adsorption of the reactants are most likely responsible for such unordinary behaviors.
UR - http://www.scopus.com/inward/record.url?scp=77249125006&partnerID=8YFLogxK
U2 - 10.1021/jp911269z
DO - 10.1021/jp911269z
M3 - Article
AN - SCOPUS:77249125006
SN - 1932-7447
VL - 114
SP - 1651
EP - 1654
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 3
ER -