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

Sanjaya D. Senanayake; Naa Adokaley Pappoe; Thuy Duong Nguyen-Phan; Si Luo; Yuanyuan Li; Wenqian Xu; Zongyuan Liu; Kumudu Mudiyanselage; Aaron C. Johnston-Peck; Anatoly I. Frenkel; Ilana Heckler; Dario Stacchiola; José A. Rodriguez

doi:10.1016/j.susc.2016.02.014

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

Sanjaya D. Senanayake, Naa Adokaley Pappoe, Thuy Duong Nguyen-Phan, Si Luo, Yuanyuan Li, Wenqian Xu, Zongyuan Liu, Kumudu Mudiyanselage, Aaron C. Johnston-Peck, Anatoly I. Frenkel, Ilana Heckler, Dario Stacchiola, José A. Rodriguez

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

We have studied the catalytic carbon monoxide (CO) oxidation (CO + 0.5O₂ → CO₂) reaction using a powder catalyst composed of both copper (5 wt.% loading) and titania (CuO_x–TiO₂). Our study was focused on revealing the role of Cu, and the interaction between Cu and TiO₂, by systematic comparison between two nanocatalysts, CuO_x–TiO₂ and pure CuO_x. 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 were also studied. Our results show that a CuO_x–TiO₂ system is more active than bulk CuO_x for the CO oxidation reaction due to its lower onset temperature and better stability at higher temperatures. Our results also suggest that surface Cu⁺ species observed in the CuO_x–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.

Original language	English
Pages (from-to)	206-212
Number of pages	7
Journal	Surface Science
Volume	652
DOIs	https://doi.org/10.1016/j.susc.2016.02.014
State	Published - Oct 1 2016
Externally published	Yes

Funding

The research carried out in this manuscript was performed at Brookhaven National Laboratory, supported by the U.S. Department of Energy , Office of Science, Office of Basic Energy Sciences, and Catalysis Science Program under contract no. DE-SC0012704 . This work used resources of the National Synchrotron Light Source (NSLS) and the Center for Functional Nanomaterials (CFN), that are DOE Office of Science User Facilities. AIF and YL gratefully acknowledge funding of their work by the U.S. DOE grant no. DE-FG02-03ER15476 . The authors acknowledge the support the facilities provided at the Synchrotron Catalysis Consortium (U.S. DOE grant no. DE-SC0012335 ).

Keywords

Carbon dioxide
Carbon monoxide
Copper
Interface
Oxidation
Titania

Access to Document

10.1016/j.susc.2016.02.014

Cite this

Senanayake, S. D., Pappoe, N. A., Nguyen-Phan, T. D., Luo, S., Li, Y., Xu, W., Liu, Z., Mudiyanselage, K., Johnston-Peck, A. C., Frenkel, A. I., Heckler, I., Stacchiola, D., & Rodriguez, J. A. (2016). Interfacial Cu⁺ promoted surface reactivity: Carbon monoxide oxidation reaction over polycrystalline copper–titania catalysts. Surface Science, 652, 206-212. https://doi.org/10.1016/j.susc.2016.02.014

@article{131c11b0390f444fb86d2be151f1ef5c,

title = "Interfacial Cu+ promoted surface reactivity: Carbon monoxide oxidation reaction over polycrystalline copper–titania catalysts",

abstract = "We have studied the catalytic carbon monoxide (CO) oxidation (CO + 0.5O2 → CO2) reaction using a powder catalyst composed of both copper (5 wt.% 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 were 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 suggest that 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.",

keywords = "Carbon dioxide, Carbon monoxide, Copper, Interface, Oxidation, Titania",

author = "Senanayake, {Sanjaya D.} and Pappoe, {Naa Adokaley} and Nguyen-Phan, {Thuy Duong} and Si Luo and Yuanyuan Li and Wenqian Xu and Zongyuan Liu and Kumudu Mudiyanselage and Johnston-Peck, {Aaron C.} and Frenkel, {Anatoly I.} and Ilana Heckler and Dario Stacchiola and Rodriguez, {Jos{\'e} A.}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = oct,

day = "1",

doi = "10.1016/j.susc.2016.02.014",

language = "English",

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Senanayake, SD, Pappoe, NA, Nguyen-Phan, TD, Luo, S, Li, Y, Xu, W, Liu, Z, Mudiyanselage, K, Johnston-Peck, AC, Frenkel, AI, Heckler, I, Stacchiola, D & Rodriguez, JA 2016, 'Interfacial Cu⁺ promoted surface reactivity: Carbon monoxide oxidation reaction over polycrystalline copper–titania catalysts', Surface Science, vol. 652, pp. 206-212. https://doi.org/10.1016/j.susc.2016.02.014

TY - JOUR

T1 - Interfacial Cu+ promoted surface reactivity

T2 - Carbon monoxide oxidation reaction over polycrystalline copper–titania catalysts

AU - Senanayake, Sanjaya D.

AU - Pappoe, Naa Adokaley

AU - Nguyen-Phan, Thuy Duong

AU - Luo, Si

AU - Li, Yuanyuan

AU - Xu, Wenqian

AU - Liu, Zongyuan

AU - Mudiyanselage, Kumudu

AU - Johnston-Peck, Aaron C.

AU - Frenkel, Anatoly I.

AU - Heckler, Ilana

AU - Stacchiola, Dario

AU - Rodriguez, José A.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - We have studied the catalytic carbon monoxide (CO) oxidation (CO + 0.5O2 → CO2) reaction using a powder catalyst composed of both copper (5 wt.% 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 were 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 suggest that 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.

AB - We have studied the catalytic carbon monoxide (CO) oxidation (CO + 0.5O2 → CO2) reaction using a powder catalyst composed of both copper (5 wt.% 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 were 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 suggest that 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.

KW - Carbon dioxide

KW - Carbon monoxide

KW - Copper

KW - Interface

KW - Oxidation

KW - Titania

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DO - 10.1016/j.susc.2016.02.014

M3 - Article

AN - SCOPUS:84960153759

SN - 0039-6028

VL - 652

SP - 206

EP - 212

JO - Surface Science

JF - Surface Science

ER -