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.

doi:10.1007/s11244-018-0941-2

Controlled Generation of TiO_x–Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors: Synthesis, Characterization and Catalysis

Journal Article · Tue Jun 12 00:00:00 EDT 2018 · Topics in Catalysis

DOI:https://doi.org/10.1007/s11244-018-0941-2· OSTI ID:1870990

Wang, Zhen ^[1]; Hou, Xianliang ^[2]; Wu, Yi Y. ^[3]; Shen, Jingmei ^[3]; Li, Tiehu ^[2]; Fang, Changqing ^[4]; Kung, Mayfair C. ^[3]; Kung, Harold H. ^[3]

Xi'an Univ. of Technology, Xi'an, Shaanxi (China); Northwestern Univ., Evanston, IL (United States); Northwestern University
Northwestern Polytechnical Univ., Xi'an, Shaanxi (China)
Northwestern Univ., Evanston, IL (United States)
Xi'an Univ. of Technology, Xi'an, Shaanxi (China)

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 TiO_x 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 TiO_x 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 TiO_x units were more selective for acetone formation versus propene formation. The results confirmed the important role of both the Au–TiO_x interface at the perimeter and the extent of Ti isolation in the TiO_x phase in the reaction.

View Accepted Manuscript (DOE)

Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); China Scholarship Council (CSC)

Grant/Contract Number:: FG02-03ER15457

OSTI ID:: 1870990

Alternate ID(s):: OSTI ID: 1459020

Journal Information:: Topics in Catalysis, Journal Name: Topics in Catalysis Journal Issue: 9-11 Vol. 61; ISSN 1022-5528

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Controlled Generation of TiOx–Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors: Synthesis, Characterization and Catalysis

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Controlled Generation of TiO_x–Au Interface Using Titanium Molecular Complex Bearing Pyridyl Anchors: Synthesis, Characterization and Catalysis