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Title: Surface Science Studies of Nano-crystalline Metal Oxide and Metal-Metal Oxide Core-Shell Catalysts

Abstract

In this project we are bridging the materials gap between fundamental surface science studies of metal-oxide, single-crystal model catalysts, and high surface catalysts that are used industrially by measuring structure-activity relationships for thin films of well-defined, metal oxide nanoparticles. We are concentrating on systems that are of interest for use as catalysts for complete-, selective- and photo-oxidation of organic oxygenates and the research program builds upon our group’s extensive experience in using surface-sensitive spectroscopic techniques to elucidate structure-activity relationships for oxide surfaces. The goals of this work are (1) determine the role that highly undercoordinated edge and corner sites play in catalysis on oxides, (2) determine if control of oxide nano-crystalline size and shape can be used to design highly active and selective catalysts for specific reactions, and (3) determine how crystallite size and shape affect the photocatalytic properties of semiconducting oxides such as TiO 2. In addition to our current studies of nanocrystalline oxides, the research program will also include studies of hierarchal structured core-shell materials in which a metal nanoparticle is encased in a porous nano-crystalline oxide shell. Such materials have interesting catalytic properties and our goal will be to use these unique model systems to study synergisticmore » interactions between a metal and a reducible metal oxide support. The work during the second year of the grant has focused on the catalytic and photocatalytic activity of thin films of well-defined TiO 2 nanocrystals that have a truncated bi-pyramidal shape. An overview of this work is given below.« less

Authors:
 [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemical and Biomolecular Engineering
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1430658
Report Number(s):
DOE-UPENN-FG-02-04ER15605
DOE Contract Number:  
FG02-04ER15605
Resource Type:
Technical Report
Resource Relation:
Related Information: 1.Exceptional Thermal Stability of Pd@CeO2 Core-Shell Catalyst Nanostructures Grafted onto an Oxide Surface, L. Adijanto, D.A. Bennett, C. Chen, A.S. Yu, M. Cargnello, P. Fornasiero, R.J. Gorte, and J.M. Vohs, Nano Letters, 13 (2013) 2252-2257.2. Thermal and Photochemical Reactions of Methanol on Nanocrystalline Anatase TiO2 Thin Films, D.A. Bennett, M. Cargnello, T.R. Gordon, C.B. Murray, and J.M. Vohs, Physical Chemistry Chemical Physics, 17 (2015) 17190-17201.3. Shape-Dependence of the Thermal and Photochemical Reactions of Methanol on Nanocrystalline Anatase TiO2, D.A. Bennett1, M. Cargnello, B.T. Diroll, C.B. Murray, and J.M. Vohs, Surface Science, 654 (2016) 1-7.4. Thermal and Photochemical Reactions of Methanol, Acetaldehyde, and Acetic Acid on Brookite TiO2 Nanorods, P.A. Pepin, B.T. Diroll, H-J. Choi, C.B. Murray, and J.M. Vohs, J Physical Chemistry C, 121 (2017) 11488-11498.5. Morphological Dependence of the Thermal and Photochemical Reactions of Acetaldehyde on Anatase TiO2 Nanocrystals, P.P. Pepin, B.T. Diroll, C.B. Murray, J.M. Vohs, Topics in Catalysis, (2017) https://doi.org/10.1007/s11244-017-0871-4. (in press, available online)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; catalysis, photocatalysis, nanomaterials

Citation Formats

Vohs, John M. Surface Science Studies of Nano-crystalline Metal Oxide and Metal-Metal Oxide Core-Shell Catalysts. United States: N. p., 2018. Web. doi:10.2172/1430658.
Vohs, John M. Surface Science Studies of Nano-crystalline Metal Oxide and Metal-Metal Oxide Core-Shell Catalysts. United States. doi:10.2172/1430658.
Vohs, John M. Mon . "Surface Science Studies of Nano-crystalline Metal Oxide and Metal-Metal Oxide Core-Shell Catalysts". United States. doi:10.2172/1430658. https://www.osti.gov/servlets/purl/1430658.
@article{osti_1430658,
title = {Surface Science Studies of Nano-crystalline Metal Oxide and Metal-Metal Oxide Core-Shell Catalysts},
author = {Vohs, John M.},
abstractNote = {In this project we are bridging the materials gap between fundamental surface science studies of metal-oxide, single-crystal model catalysts, and high surface catalysts that are used industrially by measuring structure-activity relationships for thin films of well-defined, metal oxide nanoparticles. We are concentrating on systems that are of interest for use as catalysts for complete-, selective- and photo-oxidation of organic oxygenates and the research program builds upon our group’s extensive experience in using surface-sensitive spectroscopic techniques to elucidate structure-activity relationships for oxide surfaces. The goals of this work are (1) determine the role that highly undercoordinated edge and corner sites play in catalysis on oxides, (2) determine if control of oxide nano-crystalline size and shape can be used to design highly active and selective catalysts for specific reactions, and (3) determine how crystallite size and shape affect the photocatalytic properties of semiconducting oxides such as TiO2. In addition to our current studies of nanocrystalline oxides, the research program will also include studies of hierarchal structured core-shell materials in which a metal nanoparticle is encased in a porous nano-crystalline oxide shell. Such materials have interesting catalytic properties and our goal will be to use these unique model systems to study synergistic interactions between a metal and a reducible metal oxide support. The work during the second year of the grant has focused on the catalytic and photocatalytic activity of thin films of well-defined TiO2 nanocrystals that have a truncated bi-pyramidal shape. An overview of this work is given below.},
doi = {10.2172/1430658},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {4}
}