3 Catalysts via Atomic Layer Deposition
91
Fig. 3.8 a Porous TiO 2 -coated Cu catalysts structure fabricated with ALD coupled calcination
post-treatment, b the schematic diagram of the Al 2 O 3 growth stages on Pd nanoparticles with
increasing ALD cycles, c FTIR measurements of the porous coating structure with increasing ALD
cycles, and d the catalytic performance toward methanol conversion. a is reprinted with permission
from Ref. [86]. Copyright 2015. Elsevier. b is reprinted with permission from Ref. [140]. Copyright
2012. American Chemical Society. c, d are reprinted with permission from Ref. [82]. Copyright
2011. American Chemical Society
and the activity of Au catalysts toward CO oxidation was improved Fig. 3.9a [100].
ALD was used to control the Au–TiO 2 interface without changing the Au size. Qin
et al. also demonstrated that Fe 2 O 3 firstly deposited on Pt’s low coordinated sites,
and verified by FTIR measurements and DFT simulations as shown in Fig. 3.9b. This
structure showed improved selectivity of COL (cinnamyl alcohol) yields from 45%
for unmodified Pt to 84% for Fe 2 O 3 -coated Pt catalysts [116].
A facet-selective ALD method was developed by exploiting different binding
energies of precursors chemisorbed on the nanoparticles’ crystal planes. Chen et al.
reported the CeO x deposited selectivity on Pt (111) facets and exposed Pt (100)
facets (shown in Fig. 3.9c) [127]. Ce(thd) 4 and O 3 were utilized as precursors for
ALD process. From DFT simulations, the binding energies calculated of Ce precursor
fragments (Ce(thd)
−
3 ) followed the sequence of Pt (111) > CeO 2 (111) > Pt (100),
91
Fig. 3.8 a Porous TiO 2 -coated Cu catalysts structure fabricated with ALD coupled calcination
post-treatment, b the schematic diagram of the Al 2 O 3 growth stages on Pd nanoparticles with
increasing ALD cycles, c FTIR measurements of the porous coating structure with increasing ALD
cycles, and d the catalytic performance toward methanol conversion. a is reprinted with permission
from Ref. [86]. Copyright 2015. Elsevier. b is reprinted with permission from Ref. [140]. Copyright
2012. American Chemical Society. c, d are reprinted with permission from Ref. [82]. Copyright
2011. American Chemical Society
and the activity of Au catalysts toward CO oxidation was improved Fig. 3.9a [100].
ALD was used to control the Au–TiO 2 interface without changing the Au size. Qin
et al. also demonstrated that Fe 2 O 3 firstly deposited on Pt’s low coordinated sites,
and verified by FTIR measurements and DFT simulations as shown in Fig. 3.9b. This
structure showed improved selectivity of COL (cinnamyl alcohol) yields from 45%
for unmodified Pt to 84% for Fe 2 O 3 -coated Pt catalysts [116].
A facet-selective ALD method was developed by exploiting different binding
energies of precursors chemisorbed on the nanoparticles’ crystal planes. Chen et al.
reported the CeO x deposited selectivity on Pt (111) facets and exposed Pt (100)
facets (shown in Fig. 3.9c) [127]. Ce(thd) 4 and O 3 were utilized as precursors for
ALD process. From DFT simulations, the binding energies calculated of Ce precursor
fragments (Ce(thd)
−
3 ) followed the sequence of Pt (111) > CeO 2 (111) > Pt (100),