Abstract
Ti-SBA-15 and Ti-MCM-41 were synthesized and evaluated as possible photocatalysts for the reduction of CO2, and for the photo-Kolbe decomposition of acetic acid. UV-Raman was used to study the adsorption of carbon dioxide, water, formic acid, and acetic acid over Ti-MCM-41 by monitoring the UV enhanced resonance peak of the totally symmetric stretching band of the grafted Ti species at 1,085 cm-1. Acetic and formic acid dissociate on Ti-SBA-15 and Ti-MCM-41 to form acetate and formate, respectively. The conjugate bases subsequently interact strongly with Ti sites. Water interacts with the Ti sites, while no change in the amplitude of the 1,085 cm-1 band is observed in the presence of CO2. Photocatalysis experiments indicate that these mesoporous silicalites are active in the photo-Kolbe decomposition of acetic acid. CO2 is formed by reaction of a hole with the acetate carboxylate groups. The methyl radical co-products react with a surface proton and an electron to form methane. No products resulting from the dimerization of methyl radicals are observed, presumably because of the highly dispersed active sites.
| Original language | English |
|---|---|
| Pages (from-to) | 1057-1066 |
| Number of pages | 10 |
| Journal | Catalysis Letters |
| Volume | 141 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2011 |
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Keywords
- Mesoporous silicalites
- Photo-decomposition
- Photocatalysis
- Ti-MCM-41
- Ti-SBA-15
- Titanium grafted
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Mechanistic and adsorption studies of relevance to photocatalysts on titanium grafted mesoporous silicalites. / Danon, Alon; Stair, Peter C; Weitz, Eric.
In: Catalysis Letters, Vol. 141, No. 8, 08.2011, p. 1057-1066.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanistic and adsorption studies of relevance to photocatalysts on titanium grafted mesoporous silicalites
AU - Danon, Alon
AU - Stair, Peter C
AU - Weitz, Eric
PY - 2011/8
Y1 - 2011/8
N2 - Ti-SBA-15 and Ti-MCM-41 were synthesized and evaluated as possible photocatalysts for the reduction of CO2, and for the photo-Kolbe decomposition of acetic acid. UV-Raman was used to study the adsorption of carbon dioxide, water, formic acid, and acetic acid over Ti-MCM-41 by monitoring the UV enhanced resonance peak of the totally symmetric stretching band of the grafted Ti species at 1,085 cm-1. Acetic and formic acid dissociate on Ti-SBA-15 and Ti-MCM-41 to form acetate and formate, respectively. The conjugate bases subsequently interact strongly with Ti sites. Water interacts with the Ti sites, while no change in the amplitude of the 1,085 cm-1 band is observed in the presence of CO2. Photocatalysis experiments indicate that these mesoporous silicalites are active in the photo-Kolbe decomposition of acetic acid. CO2 is formed by reaction of a hole with the acetate carboxylate groups. The methyl radical co-products react with a surface proton and an electron to form methane. No products resulting from the dimerization of methyl radicals are observed, presumably because of the highly dispersed active sites.
AB - Ti-SBA-15 and Ti-MCM-41 were synthesized and evaluated as possible photocatalysts for the reduction of CO2, and for the photo-Kolbe decomposition of acetic acid. UV-Raman was used to study the adsorption of carbon dioxide, water, formic acid, and acetic acid over Ti-MCM-41 by monitoring the UV enhanced resonance peak of the totally symmetric stretching band of the grafted Ti species at 1,085 cm-1. Acetic and formic acid dissociate on Ti-SBA-15 and Ti-MCM-41 to form acetate and formate, respectively. The conjugate bases subsequently interact strongly with Ti sites. Water interacts with the Ti sites, while no change in the amplitude of the 1,085 cm-1 band is observed in the presence of CO2. Photocatalysis experiments indicate that these mesoporous silicalites are active in the photo-Kolbe decomposition of acetic acid. CO2 is formed by reaction of a hole with the acetate carboxylate groups. The methyl radical co-products react with a surface proton and an electron to form methane. No products resulting from the dimerization of methyl radicals are observed, presumably because of the highly dispersed active sites.
KW - Mesoporous silicalites
KW - Photo-decomposition
KW - Photocatalysis
KW - Ti-MCM-41
KW - Ti-SBA-15
KW - Titanium grafted
UR - http://www.scopus.com/inward/record.url?scp=80051791099&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80051791099&partnerID=8YFLogxK
U2 - 10.1007/s10562-011-0644-9
DO - 10.1007/s10562-011-0644-9
M3 - Article
VL - 141
SP - 1057
EP - 1066
JO - Catalysis Letters
JF - Catalysis Letters
SN - 1011-372X
IS - 8
ER -