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  English.dicp.cas.cn    Posted:2013-10-21
Zhang Dayu lectureship(XIII):SYNTHESIS OF NEW CATALYTIC SYSTEMS BY ATOMIC LAYER DEPOSITION

  TimeOct. 24th, 2013  930 

  LocationConference Room of Basic Energy Science Building 

  LecturerPeter C. Stair

Northwestern University,USA 

  Introduction: 

   Profesor Peter C. Stair is an internationally well recognized scientist in catalysis and surface science. He is currently the director of the Center for Catalysis and Surface Science and of the Institute for Catalysis in Energy Processes in Northwestern University, and Senior Scientist in the Chemical Sciences and Engineering Division at Argonne National Laboratory and Deputy Director of the Institute for Atom-efficient Chemical Transformations. He has received the Alexander von Humboldt Senior Scientist Award and the 2010 ACS George Olah Award in Hydrocarbon or Petroleum Chemistry.

  Professor Stair has worked in surface science and in-situ Raman spectroscopy. Recently, his research focuses on the development and use of Atomic Layer Deposition (ALD) for the synthesis of stable and selective catalysts. He uses ALD reactors to develop new growth methods and synthesize catalysts and uses UV Raman spectroscopy to do in-situ characterization of hydrocarbon formation on catalyst surfaces, to better target and prevent coke formation. In conjunction with low-pressure ALD reactors, he is also studying ALD growth processes in ultra-high vacuum (UHV) conditions. Testing of catalysts synthesized by ALD is done in the Northwestern Clean Catalysis Facility, using a multiline Altamira system. His research results have been published in many high profile journals, including Science, Nat. Chem., Angew. Chem., J. Catalysis and etc. 

  Abstract: 

  Atomic Layer Deposition (ALD) has enormous potential for the synthesis of advanced heterogeneous catalysts with control of composition and structure at the atomic scale. The ability of ALD to produce conformal oxide coatings on porous, high-surface area materials can provide completely new types of catalyst supports. At the same time ALD can achieve highly uniform catalytically active metal and oxide phases with (sub-) nanometer dimensions. This lecture will provide examples from our laboratory of ALD used to synthesize oxide supports, catalytic oxide overlayers, metal nanoparticles, and new porous structures. These materials have been characterized by SEM, XRF, ICP, UV-Vis absorption spectroscopy, Raman spectroscopy and evaluated for catalysis of oxidative and non-oxidative alkane dehydrogenation, selective photo-oxidation, and combustion. We have focused on the synthesis of supported metal nanoparticles and developed a procedure in which the metal and support materials are grown sequentially in each ALD cycle. This method makes possible the synthesis of exceptionally small particles, ca. 0.5 nm. Using additional ALD support layers at the conclusion of the growth, a process we call overcoating, the metal particles can be stabilized against sintering and leaching while still remaining active under harsh conditions in both gas and liquid phase reactions. Through proper annealing procedures the overcoating oxide develops porosity, thus ALD becomes a method for introducing and controlling pore structures. Finally, with templated ALD it is possible to prepare surface cavities, which we call nanobowls. These structures exhibit size selectivity, where large molecules are excluded from interacting with the catalyst material.  

  ContactsGroup 505  Jia Mao9307 

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