Project Details
Abstract
Atomic layer epitaxy (ALE) is a method for growing single crystals and thin films
with the primary advantage that it allows a good conformal coating to obtain nano-particle of
metals. This self-controlling feature of ALE allows the growth of uniform compound layers
not only on flat substrates but on porous, heterogeneous surfaces. The ALE technique will be
applied to produce high dispersion catalysts in this study. In the research reported herein, a
Cu/SiO2 catalyst with nanoscale copper particles was prepared using the ALE technique, and
the newly developed copper catalysts were found to display dramatic activity for the WGS
reaction at room temperature.
In the first year, the active sites and chemical state of the ALE-Cu/SiO2 catalyst are
discussed in relation to the characterization and activity results of the WGS reaction. The
kinetic parameters for WGS reaction on ALE-Cu/SiO2 catalyst will be measured, and are used
to propose to possible reaction mechanism. We used CO as a probe molecule to identify the
active sites on the ALE-Cu/SiO2 catalyst, because it is a good probe molecule for vibrational
spectroscopy and can usually provide important information about the surface sites of
adsorbed species and the chemical environment of a copper surface. In the second year, the
reaction mechanism of WGS reaction, active sites for H2O adsorbed and H2O dissociation
will be investigated by the IR and TPD techniques. We will build up a flow reaction system
combining FT-IR, TPD and GC-TCD techniques. On the other hand, FIIR also will be applied
to perform the kinetic parameters for WGS reaction on ALE-Cu/SiO2 surface. In the third
year, the fundamental properties of ALE Cu catalysts will be studied in that Cu precursor
binding with porous support, decomposition of Cu precursor on support and formation
mechanism of Cu particle from Cu precursor. The ALE-Cu/SiO2 catalysts will be investigated
the aggregation of Cu particles under high temperature. We will focus the study on the
fundamentally growth of Cu particles on surface. The examination of catalysts, by EXAFS,
DR-UV/VIS, TPR, XRD, AES, ESCA etc., may be associated with experimental results of
TPD and IR.
Project IDs
Project ID:PA9807-2085
External Project ID:NSC98-2113-M182-001-MY2
External Project ID:NSC98-2113-M182-001-MY2
Status | Finished |
---|---|
Effective start/end date | 01/08/09 → 31/07/10 |
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