Abstract
Nanocatalysts consist of small size-selected clusters adsorbed on
uniform sites of a support material. Here, we focus on a simple model
system, which is fabricated by soft-landing atomic Pd ions on oxygen
vacancies (F-centers) of a MgO(1 0 0) surface (Pd-1 /MgO(F-s)).
We used thermal desorption and infrared spectroscopies (TDS, FTIR)
to study the acetylene polymerization and the CO oxidation catalyzed
by this system. In one-heating-cycle experiments, only the formation
of benzene is observed during the polymerization reaction and the
combustion of CO leads to the formation of CO, detected at 260
and 500 K. Experimental results in combination with ab initio calculations
reveal the mechanisms of these reactions and demonstrate the role
of surface defects in nanocatalysis. (C) 2002 Elsevier Science
B.V. All rights reserved.
- ,
- acetylene,
- approximation,
- clusters,
- co
- energy,
- gold,
- mgo
- model
- oxidation,
- pd(111),
- pd,
- reactivity,
- sites
- supported
- surface,
- system,
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