Abstract
Small gold particles having sizes of 1.0-2.0 nm were deposited on the surface of the sodium trititanate (Na2Ti3O7) nanotube by the ion exchange method. This nanotube-supported gold catalyst was able to oxidize CO at the sub-ambient temperature. In a pulse reactor, the gold catalyst could achieve a T50% of 218 K using 1.0 vol.% CO/He gas pulses (0.34 μmol CO/pulse). In the Au loadings of 0.39-2.53 wt.%, the activity of the gold catalyst increased with the gold loading. Calcination of nanotube support at higher than 383 K prior to the gold deposition produced a catalyst with a lower activity. Regarding the effect of calcining the gold particles on the activity (with NaTNT support calcined at 673 K), the catalyst with gold particles heated at 383 K only exhibited the best CO oxidation activity. XPS indicated that there are three gold species with different oxidation state, Au0, Au+1 and Auδ-, in the calcined gold catalysts. As calcination temperature increased, the Au0 concentration increased at the consumption of Au+1 species, while the Auδ- concentration remained relatively constant. This fact strongly suggested that Au+1 species must play an important role in the activity in the sub-ambient temperature region.
| Original language | English |
|---|---|
| Pages (from-to) | 115-124 |
| Number of pages | 10 |
| Journal | Journal of Molecular Catalysis A: Chemical |
| Volume | 298 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2009 Feb 2 |
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All Science Journal Classification (ASJC) codes
- Catalysis
- Process Chemistry and Technology
- Physical and Theoretical Chemistry
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Low temperature carbon monoxide oxidation over gold nanoparticles supported on sodium titanate nanotubes. / Tsai, Jui Ying; Chao, Jiunn Hsing; Lin, Chiu-Hsun.
In: Journal of Molecular Catalysis A: Chemical, Vol. 298, No. 1-2, 02.02.2009, p. 115-124.Research output: Contribution to journal › Article
TY - JOUR
T1 - Low temperature carbon monoxide oxidation over gold nanoparticles supported on sodium titanate nanotubes
AU - Tsai, Jui Ying
AU - Chao, Jiunn Hsing
AU - Lin, Chiu-Hsun
PY - 2009/2/2
Y1 - 2009/2/2
N2 - Small gold particles having sizes of 1.0-2.0 nm were deposited on the surface of the sodium trititanate (Na2Ti3O7) nanotube by the ion exchange method. This nanotube-supported gold catalyst was able to oxidize CO at the sub-ambient temperature. In a pulse reactor, the gold catalyst could achieve a T50% of 218 K using 1.0 vol.% CO/He gas pulses (0.34 μmol CO/pulse). In the Au loadings of 0.39-2.53 wt.%, the activity of the gold catalyst increased with the gold loading. Calcination of nanotube support at higher than 383 K prior to the gold deposition produced a catalyst with a lower activity. Regarding the effect of calcining the gold particles on the activity (with NaTNT support calcined at 673 K), the catalyst with gold particles heated at 383 K only exhibited the best CO oxidation activity. XPS indicated that there are three gold species with different oxidation state, Au0, Au+1 and Auδ-, in the calcined gold catalysts. As calcination temperature increased, the Au0 concentration increased at the consumption of Au+1 species, while the Auδ- concentration remained relatively constant. This fact strongly suggested that Au+1 species must play an important role in the activity in the sub-ambient temperature region.
AB - Small gold particles having sizes of 1.0-2.0 nm were deposited on the surface of the sodium trititanate (Na2Ti3O7) nanotube by the ion exchange method. This nanotube-supported gold catalyst was able to oxidize CO at the sub-ambient temperature. In a pulse reactor, the gold catalyst could achieve a T50% of 218 K using 1.0 vol.% CO/He gas pulses (0.34 μmol CO/pulse). In the Au loadings of 0.39-2.53 wt.%, the activity of the gold catalyst increased with the gold loading. Calcination of nanotube support at higher than 383 K prior to the gold deposition produced a catalyst with a lower activity. Regarding the effect of calcining the gold particles on the activity (with NaTNT support calcined at 673 K), the catalyst with gold particles heated at 383 K only exhibited the best CO oxidation activity. XPS indicated that there are three gold species with different oxidation state, Au0, Au+1 and Auδ-, in the calcined gold catalysts. As calcination temperature increased, the Au0 concentration increased at the consumption of Au+1 species, while the Auδ- concentration remained relatively constant. This fact strongly suggested that Au+1 species must play an important role in the activity in the sub-ambient temperature region.
UR - http://www.scopus.com/inward/record.url?scp=58049198300&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=58049198300&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2008.10.019
DO - 10.1016/j.molcata.2008.10.019
M3 - Article
AN - SCOPUS:58049198300
VL - 298
SP - 115
EP - 124
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
SN - 1381-1169
IS - 1-2
ER -