Cu supported on mesoporous ceria: water gas shift activity at low Cu loadings through metal–support interactions | Zendy

Dimitriy Vovchok | Zendy; Curtis Guild | Zendy; Jordi Llorca | Zendy; Wenqian Xu | Zendy; Tahereh Jafari | Zendy; Panteha Toloueinia | Zendy; David A. Kriz | Zendy; Iradwikanari Waluyo | Zendy; Robert M. Palomino | Zendy; José A. Rodríguez | Zendy; Steven L. Suib | Zendy; Sanjaya D. Senanayake | Zendy

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Cu supported on mesoporous ceria: water gas shift activity at low Cu loadings through metal–support interactions

Author(s) -

Dimitriy Vovchok,

Curtis Guild,

Jordi Llorca,

Wenqian Xu,

Tahereh Jafari,

Panteha Toloueinia,

David A. Kriz,

Iradwikanari Waluyo,

Robert M. Palomino,

José A. Rodríguez,

Steven L. Suib,

Sanjaya D. Senanayake

Publication year - 2017

Publication title -

physical chemistry chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.053

H-Index - 239

eISSN - 1463-9084

pISSN - 1463-9076

DOI - 10.1039/c7cp02378b

Subject(s) - xanes , copper , mesoporous material , catalysis , water gas shift reaction , formate , inorganic chemistry , metal , oxide , copper oxide , chemistry , materials science , fourier transform infrared spectroscopy , chemical engineering , spectroscopy , organic chemistry , engineering , physics , quantum mechanics

We have synthesized and tested a highly active Cu doped mesoporous CeO 2 catalyst system for the low temperature water-gas shift (WGS) reaction. While typical oxide-supported copper WGS catalysts are characterized by high copper loadings (30-40%), the morphological properties of the mesoporous CeO 2 material enable high catalytic activity at copper loadings as low as 1%. Operando X-ray diffraction, in situ X-ray absorption near-edge structure spectroscopy (XANES), and operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) methods were used to probe the interactions between the metal and mesoporous oxide components under reaction conditions. Copper was observed to undergo reduction from oxide to metal under WGS conditions at 150 °C, while the CeO 2 lattice was observed to expand upon heating, indicating Ce 3+ formation correlated with CO 2 production. The active state of the catalysts was confirmed by in situ XANES to contain Cu 0 and partially reduced CeO 2 . DRIFTS analysis revealed carboxyl species bound to copper during reduction, as well as formate and carbonate surface species on ceria. Lower concentrations of copper were observed to foster enhanced metal-support interactions.

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