Abstract
Distinction between geometric and ligand effects has been studied by the infrared study of CO chemisorption on four catalyst samples modified by niobia. According to earlier studies the metal-support interface plays a crucial role in the CH3OH + D2 reaction. Platinum and niobia content, oxidative-reductive treatment and chloride content has a great influence of the niobia decorating Pt surface. High temperature reduction does not effect niobia-free sample, while niobia addition decreases the bridged/linear ratio of the adsorbed CO, especially in the SMSI state. Simultaneously the peak positions are shifting towards higher frequencies. Both geometric effect of decoration and ligand effect are observed. The observed effect has been further supported by XRD data for the platinum crystallite sizes and a quantitative parameter for the characterization of SMSI is proposed.
| Original language | English |
|---|---|
| Pages (from-to) | 435-446 |
| Number of pages | 12 |
| Journal | Catalysis Today |
| Volume | 16 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - May 3 1993 |
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ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
Cite this
Structure and methanol activation : niobia promoted Pt/Al2O3 catalysts. / Hoffer, T.; Dobos, S.; Guczi, L.
In: Catalysis Today, Vol. 16, No. 3-4, 03.05.1993, p. 435-446.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structure and methanol activation
T2 - niobia promoted Pt/Al2O3 catalysts
AU - Hoffer, T.
AU - Dobos, S.
AU - Guczi, L.
PY - 1993/5/3
Y1 - 1993/5/3
N2 - Distinction between geometric and ligand effects has been studied by the infrared study of CO chemisorption on four catalyst samples modified by niobia. According to earlier studies the metal-support interface plays a crucial role in the CH3OH + D2 reaction. Platinum and niobia content, oxidative-reductive treatment and chloride content has a great influence of the niobia decorating Pt surface. High temperature reduction does not effect niobia-free sample, while niobia addition decreases the bridged/linear ratio of the adsorbed CO, especially in the SMSI state. Simultaneously the peak positions are shifting towards higher frequencies. Both geometric effect of decoration and ligand effect are observed. The observed effect has been further supported by XRD data for the platinum crystallite sizes and a quantitative parameter for the characterization of SMSI is proposed.
AB - Distinction between geometric and ligand effects has been studied by the infrared study of CO chemisorption on four catalyst samples modified by niobia. According to earlier studies the metal-support interface plays a crucial role in the CH3OH + D2 reaction. Platinum and niobia content, oxidative-reductive treatment and chloride content has a great influence of the niobia decorating Pt surface. High temperature reduction does not effect niobia-free sample, while niobia addition decreases the bridged/linear ratio of the adsorbed CO, especially in the SMSI state. Simultaneously the peak positions are shifting towards higher frequencies. Both geometric effect of decoration and ligand effect are observed. The observed effect has been further supported by XRD data for the platinum crystallite sizes and a quantitative parameter for the characterization of SMSI is proposed.
UR - http://www.scopus.com/inward/record.url?scp=0027907505&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0027907505&partnerID=8YFLogxK
U2 - 10.1016/0920-5861(93)80083-D
DO - 10.1016/0920-5861(93)80083-D
M3 - Article
AN - SCOPUS:0027907505
VL - 16
SP - 435
EP - 446
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
IS - 3-4
ER -