TY  - JOUR
AU  - Gashnikova, Daria
AU  - Struzek, Samuel
AU  - Maurer, Florian
AU  - Bauer, Miriam R.
AU  - Maliakkal, Carina B.
AU  - Kübel, Christian
AU  - Casapu, Maria
AU  - Grunwaldt, Jan-Dierk
TI  - Complementary and Spatially Resolved Operando Spectroscopic Investigation of Pt/Al<sub>2</sub>O<sub>3</sub> and Pt/CeO<sub>2</sub> Catalysts during CO/NO Conversion 
JO  - The journal of physical chemistry / C
VL  - 129
IS  - 31
SN  - 1932-7447
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2025-04555
SP  - 13923 - 13938
PY  - 2025
AB  - The composition of reaction mixtures strongly influences the structural evolution and performance of noble metal-based catalysts. In this work, we compared the effect of the simultaneous presence of CO and NO on the noble metal state and CO oxidation activity of Pt/Al<sub>2</sub>O<sub>3</sub> and Pt/CeO<sub>2</sub> catalysts under close-to-stoichiometric conditions using complementary in situ/operando X-ray and infrared spectroscopic techniques. For the utilized catalysts, the integral catalytic performance data indicated a diminished CO oxidation activity in the presence of NO, which is due to a competitive adsorption of CO and NO, as elucidated by the diffuse reflectance infrared Fourier transform spectroscopy and high-energy resolution X-ray fluorescence X-ray absorption near-edge structure results. Spatially resolved operando X-ray absorption spectroscopy investigations and extended X-ray absorption fine structure analysis unraveled that the addition of NO led to a higher oxidation state of Pt along the entire catalyst bed for both samples. Moreover, NO was found to delay the reduction of Pt particles on Al<sub>2</sub>O<sub>3</sub> and hinder the formation of active Pt clusters on CeO<sub>2</sub>. As a result, a more oxidized Pt state at the beginning of the catalyst bed and a low overall activity were observed for Pt/CeO<sub>2</sub>. However, the CO oxidation activity could be enhanced by a reductive pretreatment of the Pt/CeO<sub>2</sub> catalyst, resulting in a similar reduced Pt state along the entire catalyst bed and minimizing the negative impact of NO during the combined reaction.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1021/acs.jpcc.5c01963
UR  - https://bib-pubdb1.desy.de/record/639469
ER  -