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Controlled Generation of TiOx-Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors: Synthesis, Characterization and Catalysis.
- Source :
- Topics in Catalysis; Jun2018, Vol. 61 Issue 9-11, p800-809, 10p, 1 Black and White Photograph, 2 Diagrams, 1 Chart, 3 Graphs
- Publication Year :
- 2018
-
Abstract
- Interfacial perimeter sites between metal and support are often important for catalysis. A mononuclear titanium siloxy complex III, Ti(acac)<subscript>2</subscript>[OSiC<subscript>6</subscript>H<subscript>5</subscript>N(OCH<subscript>3</subscript>)<subscript>2</subscript>]<subscript>2</subscript> was synthesized to generate TiO<subscript>x</subscript> units of different degrees of clustering to decorate Au nanoparticles. Two different methods of preparation were examined; one was to deposit III onto Au/SiO<subscript>2</subscript> and the other was to form III-covered Au nanoparticle first before deposition onto SiO<subscript>2</subscript>. The former method generated more highly dispersed TiO<subscript>x</subscript> units, while larger domains of TiO<subscript>2</subscript> were formed with the latter method, as deduced by UV-vis and XAS characterization. A model was proposed to explain how TiO<subscript>x</subscript> dispersity could be related to the preparative procedures. These samples were further tested as catalysts in selective oxidation of propane in a stream of O<subscript>2</subscript> and H<subscript>2</subscript>. They exhibited different product selectivities. The sample with more dispersed TiO<subscript>x</subscript> units were more selective for acetone formation versus propene formation. The results confirmed the important role of both the Au-TiO<subscript>x</subscript> interface at the perimeter and the extent of Ti isolation in the TiO<subscript>x</subscript> phase in the reaction. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10225528
- Volume :
- 61
- Issue :
- 9-11
- Database :
- Complementary Index
- Journal :
- Topics in Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 130275700
- Full Text :
- https://doi.org/10.1007/s11244-018-0941-2