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Title: Interfacial Cu+ promoted surface reactivity: Carbon monoxide oxidation reaction over polycrystalline copper-titania catalysts

Journal Article · · Surface Science
 [1];  [2];  [1];  [3];  [4];  [1];  [3];  [1];  [1];  [4];  [3];  [1];  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. City College of New York, NY (United States)
  3. Stony Brook Univ., NY (United States)
  4. Yeshiva Univ., New York, NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
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We have studied the catalytic carbon monoxide (CO) oxidation (CO+0.5O2 → CO2) reaction using a powder catalyst composed of both copper (5wt% loading) and titania (CuOx-TiO2). Our study was focused on revealing the role of Cu, and the interaction between Cu and TiO2, by systematic comparison between two nanocatalysts, CuOx-TiO2 and pure CuOx. We interrogated these catalysts under in situ conditions using X-ray Diffraction (XRD), X-ray Absorption Fine Structure (XAFS) and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) to probe the structure and electronic properties of the catalyst at all stages of the reaction and simultaneously probe the surface states or intermediates of this reaction. With the aid of several ex situ characterization techniques including Transmission Electron Microscopy (TEM), the local catalyst morphology and structure was also studied. Our results show that a CuOx-TiO2 system is more active than bulk CuOx for the CO oxidation reaction due to its lower onset temperature and better stability at higher temperatures. Our results also suggests that a surface Cu+ species observed in the CuOx-TiO2 interface are likely to be a key player in the CO oxidation mechanism, while implicating that the stabilization of this species is probably associated with the oxide-oxide interface. Both in situ DRIFTS and XAFS measurements reveal that there is likely to be a Cu(Ti)-O mixed oxide at this interface. We discuss the nature of this Cu(Ti)-O interface and interpret its role on the CO oxidation reaction.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; SC0012704; FG02-03ER15476; SC0012335
OSTI ID:
1329786
Alternate ID(s):
OSTI ID: 1359911
Report Number(s):
BNL-112732-2016-JA; R&D Project: CO009; KC0302010
Journal Information:
Surface Science, Vol. 652; ISSN 0039-6028
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (25)

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Nature of the Mixed-Oxide Interface in Ceria–Titania Catalysts: Clusters, Chains, and Nanoparticles journal July 2013
Stabilization of Catalytically Active Cu + Surface Sites on Titanium-Copper Mixed-Oxide Films journal April 2014
Tuning the Properties of Copper-Based Catalysts Based on Molecular in Situ Studies of Model Systems journal June 2015
How to stabilize highly active Cu+ cations in a mixed-oxide catalyst journal April 2016
Direct Epoxidation of Propylene over Stabilized Cu + Surface Sites on Titanium-Modified Cu 2 O journal July 2015
Complex Catalytic Behaviors of CuTiO x Mixed-Oxide during CO Oxidation journal September 2015
Active gold-ceria and gold-ceria/titania catalysts for CO oxidation: From single-crystal model catalysts to powder catalysts journal February 2015
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Cited By (2)

Effect of Ce Doping on Catalytic Performance of Cu/TiO2 for CO Oxidation journal February 2020
The influence of support composition on the activity of Cu:Ce catalysts for selective catalytic reduction of NO by CO in the presence of excess oxygen journal January 2020

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