Abstract
Catalytic tests of the Au-zeolites pure or doped with Na revealed the existence of two types of active sites of gold in CO oxidation - partly charged gold clusters Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (high-temperature activity). The data obtained demonstrates clear direct dependence of gold species reactivity on zeolite acid properties (Si/Al molar ratio and Na addition). Na modified Au-zeolites with different Si/Al molar ratio were found to be activated in CO oxidation in different degrees due to diverse redox state of supported gold species. The revealed effect of activation of one of two active species in CO oxidation (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.
| Original language | English |
|---|---|
| Pages (from-to) | 1277-1281 |
| Number of pages | 5 |
| Journal | Catalysis Communications |
| Volume | 9 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 31 Mar 2008 |
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Keywords
- Active sites
- Clusters
- CO catalytic oxidation
- Gold
- Nanoparticles
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
Cite this
Influence of sodium on activation of gold species in Y-zeolites. / Simakov, A.; Tuzovskaya, I.; Bogdanchikova, N.; Pestryakov, A.; Avalos, M.; Farias, M. H.; Smolentseva, E.
In: Catalysis Communications, Vol. 9, No. 6, 31.03.2008, p. 1277-1281.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of sodium on activation of gold species in Y-zeolites
AU - Simakov, A.
AU - Tuzovskaya, I.
AU - Bogdanchikova, N.
AU - Pestryakov, A.
AU - Avalos, M.
AU - Farias, M. H.
AU - Smolentseva, E.
PY - 2008/3/31
Y1 - 2008/3/31
N2 - Catalytic tests of the Au-zeolites pure or doped with Na revealed the existence of two types of active sites of gold in CO oxidation - partly charged gold clusters Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (high-temperature activity). The data obtained demonstrates clear direct dependence of gold species reactivity on zeolite acid properties (Si/Al molar ratio and Na addition). Na modified Au-zeolites with different Si/Al molar ratio were found to be activated in CO oxidation in different degrees due to diverse redox state of supported gold species. The revealed effect of activation of one of two active species in CO oxidation (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.
AB - Catalytic tests of the Au-zeolites pure or doped with Na revealed the existence of two types of active sites of gold in CO oxidation - partly charged gold clusters Aunδ + (low-temperature activity) and gold nanoparticles Aum0 (high-temperature activity). The data obtained demonstrates clear direct dependence of gold species reactivity on zeolite acid properties (Si/Al molar ratio and Na addition). Na modified Au-zeolites with different Si/Al molar ratio were found to be activated in CO oxidation in different degrees due to diverse redox state of supported gold species. The revealed effect of activation of one of two active species in CO oxidation (Aunδ +) is promising for improvement of activity and stability of the gold-zeolites catalysts.
KW - Active sites
KW - Clusters
KW - CO catalytic oxidation
KW - Gold
KW - Nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=39249084182&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=39249084182&partnerID=8YFLogxK
U2 - 10.1016/j.catcom.2007.11.027
DO - 10.1016/j.catcom.2007.11.027
M3 - Article
AN - SCOPUS:39249084182
VL - 9
SP - 1277
EP - 1281
JO - Catalysis Communications
JF - Catalysis Communications
SN - 1566-7367
IS - 6
ER -