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Title: When ruthenia met titania: Achieving extraordinary catalytic activity at low temperature by nanostructuring of oxides

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI: https://doi.org/10.1039/c5cp04638f · OSTI ID:1234376
 [1];  [2];  [2];  [3];  [4];  [2];  [1]
  1. Univ. de Sevilla, Sevilla (Spain)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. Central de Venezuela, Caracas (Venezuela)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Instituto Venezolano de Investigaciones Cientificas (IVIC), Caracas (Venezuela)
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Nanostructured RuOx/TiO2(110) catalysts have a remarkable catalytic activity for CO oxidation at temperatures in the range of 350–375 K. Furthermore, the RuO2(110) surface has no activity. The state-of-the-art DFT calculations indicate that the main reasons for such an impressive improvement in the catalytic activity are: (i) a decrease of the diffusion barrier of adsorbed O atoms by around 40%, from 1.07 eV in RuO2(110) to 0.66 eV in RuOx/TiO2(110), which explains the shift of the activity to lower temperatures and (ii) a lowering of the barrier by 20% for the association of adsorbed CO and O species to give CO2 (the main barrier for the CO oxidation reaction) passing from around 0.7 eV in RuO2(110) to 0.55 eV in RuOx/TiO2(110). We show that the catalytic properties of ruthenia are strongly modified when supported as nanostructures on titania, attaining higher activity at temperatures 100 K lower than that needed for pure ruthenia. As in other systems consisting of ceria nanostructures supported on titania, nanostructured ruthenia shows strongly modified properties compared to the pure oxide, consolidating the fact that the nanostructuring of oxides is a main way to attain higher catalytic activity at lower temperatures.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1234376
Report Number(s):
BNL--111670-2015-JA; KC0302010
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 40 Vol. 17; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (23)

Determining the Behavior of RuOx Nanoparticles in Mixed-Metal Oxides: Structural and Catalytic Properties of RuO2/TiO2(110) Surfaces journal September 2011
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Catalytic oxidation of CO by platinum group metals: from ultrahigh vacuum to elevated pressures journal August 2002
Automotive exhaust catalysis journal May 2003
Oxidation of methanol on Ru catalyst: Effect of the reagents partial pressures on the catalyst oxidation state and selectivity journal June 2007
Surface Chemistry of Ruthenium Dioxide in Heterogeneous Catalysis and Electrocatalysis: From Fundamental to Applied Research journal March 2012
Structure of Clean and Adsorbate-Covered Single-Crystal Rutile TiO 2 Surfaces journal December 2012
Gold, Copper, and Platinum Nanoparticles Dispersed on CeO x /TiO 2 (110) Surfaces: High Water-Gas Shift Activity and the Nature of the Mixed-Metal Oxide at the Nanometer Level journal January 2010
Ru(0001) Model Catalyst under Oxidizing and Reducing Reaction Conditions:  In-Situ High-Pressure Surface X-ray Diffraction Study journal October 2005
Nature of the Mixed-Oxide Interface in Ceria–Titania Catalysts: Clusters, Chains, and Nanoparticles journal July 2013
Identification of Ice Nucleation Active Sites on Feldspar Dust Particles journal November 2014
Self-regeneration of a Pd-perovskite catalyst for automotive emissions control journal July 2002
Chemical reactions on rutile TiO2(110) journal January 2008
Automotive catalysis studied by surface science journal January 2008
A theoretical insight into the catalytic effect of a mixed-metal oxide at the nanometer level: The case of the highly active metal/CeOx/TiO2(110) catalysts journal March 2010
High catalytic activity of Au/CeOx/TiO2(110) controlled by the nature of the mixed-metal oxide at the nanometer level journal March 2009
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From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO2 journal July 2014
Atomic-Scale Structure and Catalytic Reactivity of the RuO2(110) Surface journal February 2000

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY