Abstract
Interfacial perimeter sites between metal and support are often important for catalysis. A mononuclear titanium siloxy complex III, Ti(acac)2[OSiC6H5N(OCH3)2]2 was synthesized to generate TiOx units of different degrees of clustering to decorate Au nanoparticles. Two different methods of preparation were examined; one was to deposit III onto Au/SiO2 and the other was to form III-covered Au nanoparticle first before deposition onto SiO2. The former method generated more highly dispersed TiOx units, while larger domains of TiO2 were formed with the latter method, as deduced by UV–vis and XAS characterization. A model was proposed to explain how TiOx dispersity could be related to the preparative procedures. These samples were further tested as catalysts in selective oxidation of propane in a stream of O2 and H2. They exhibited different product selectivities. The sample with more dispersed TiOx units were more selective for acetone formation versus propene formation. The results confirmed the important role of both the Au–TiOx interface at the perimeter and the extent of Ti isolation in the TiOx phase in the reaction.
| Original language | English |
|---|---|
| Pages (from-to) | 800-809 |
| Number of pages | 10 |
| Journal | Topics in Catalysis |
| Volume | 61 |
| Issue number | 9-11 |
| DOIs | |
| Publication status | Published - Jun 1 2018 |
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Keywords
- Interface
- Inverse catalyst
- Propane oxidation
- Supported gold
- TiO
- Titanium complex precursors
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Controlled Generation of TiOx–Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors : Synthesis, Characterization and Catalysis. / Wang, Zhen; Hou, Xianliang; Wu, Yi Y.; Shen, Jingmei; Li, Tiehu; Fang, Changqing; Kung, Mayfair C.; Kung, Harold H.
In: Topics in Catalysis, Vol. 61, No. 9-11, 01.06.2018, p. 800-809.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlled Generation of TiOx–Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors
T2 - Synthesis, Characterization and Catalysis
AU - Wang, Zhen
AU - Hou, Xianliang
AU - Wu, Yi Y.
AU - Shen, Jingmei
AU - Li, Tiehu
AU - Fang, Changqing
AU - Kung, Mayfair C.
AU - Kung, Harold H
PY - 2018/6/1
Y1 - 2018/6/1
N2 - Interfacial perimeter sites between metal and support are often important for catalysis. A mononuclear titanium siloxy complex III, Ti(acac)2[OSiC6H5N(OCH3)2]2 was synthesized to generate TiOx units of different degrees of clustering to decorate Au nanoparticles. Two different methods of preparation were examined; one was to deposit III onto Au/SiO2 and the other was to form III-covered Au nanoparticle first before deposition onto SiO2. The former method generated more highly dispersed TiOx units, while larger domains of TiO2 were formed with the latter method, as deduced by UV–vis and XAS characterization. A model was proposed to explain how TiOx dispersity could be related to the preparative procedures. These samples were further tested as catalysts in selective oxidation of propane in a stream of O2 and H2. They exhibited different product selectivities. The sample with more dispersed TiOx units were more selective for acetone formation versus propene formation. The results confirmed the important role of both the Au–TiOx interface at the perimeter and the extent of Ti isolation in the TiOx phase in the reaction.
AB - Interfacial perimeter sites between metal and support are often important for catalysis. A mononuclear titanium siloxy complex III, Ti(acac)2[OSiC6H5N(OCH3)2]2 was synthesized to generate TiOx units of different degrees of clustering to decorate Au nanoparticles. Two different methods of preparation were examined; one was to deposit III onto Au/SiO2 and the other was to form III-covered Au nanoparticle first before deposition onto SiO2. The former method generated more highly dispersed TiOx units, while larger domains of TiO2 were formed with the latter method, as deduced by UV–vis and XAS characterization. A model was proposed to explain how TiOx dispersity could be related to the preparative procedures. These samples were further tested as catalysts in selective oxidation of propane in a stream of O2 and H2. They exhibited different product selectivities. The sample with more dispersed TiOx units were more selective for acetone formation versus propene formation. The results confirmed the important role of both the Au–TiOx interface at the perimeter and the extent of Ti isolation in the TiOx phase in the reaction.
KW - Interface
KW - Inverse catalyst
KW - Propane oxidation
KW - Supported gold
KW - TiO
KW - Titanium complex precursors
UR - http://www.scopus.com/inward/record.url?scp=85048371958&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048371958&partnerID=8YFLogxK
U2 - 10.1007/s11244-018-0941-2
DO - 10.1007/s11244-018-0941-2
M3 - Article
AN - SCOPUS:85048371958
VL - 61
SP - 800
EP - 809
JO - Topics in Catalysis
JF - Topics in Catalysis
SN - 1022-5528
IS - 9-11
ER -