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| Home > Publications database > Complementary and Spatially Resolved Operando Spectroscopic Investigation of Pt/Al$_2$O$_3$ and Pt/CeO$_2$ Catalysts during CO/NO Conversion > print |
| Home > Publications database > Complementary and Spatially Resolved Operando Spectroscopic Investigation of Pt/Al$_2$O$_3$ and Pt/CeO$_2$ Catalysts during CO/NO Conversion > print |
| 001 | 639469 | ||
| 005 | 20251202213756.0 | ||
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| 100 | 1 | _ | |a Gashnikova, Daria |0 P:(DE-H253)PIP1096383 |b 0 |
| 245 | _ | _ | |a Complementary and Spatially Resolved Operando Spectroscopic Investigation of Pt/Al$_2$O$_3$ and Pt/CeO$_2$ Catalysts during CO/NO Conversion |
| 260 | _ | _ | |a Washington, DC |c 2025 |b Soc. |
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| 520 | _ | _ | |a 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$_2$O$_3$ and Pt/CeO$_2$ 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$_2$O$_3$ and hinder the formation of active Pt clusters on CeO$_2$. 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$_2$. However, the CO oxidation activity could be enhanced by a reductive pretreatment of the Pt/CeO$_2$ catalyst, resulting in a similar reduced Pt state along the entire catalyst bed and minimizing the negative impact of NO during the combined reaction. |
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| 700 | 1 | _ | |a Struzek, Samuel |0 P:(DE-H253)PIP1098309 |b 1 |
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| 700 | 1 | _ | |a Bauer, Miriam R. |b 3 |
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| 700 | 1 | _ | |a Grunwaldt, Jan-Dierk |0 P:(DE-H253)PIP1008522 |b 7 |e Corresponding author |
| 773 | _ | _ | |a 10.1021/acs.jpcc.5c01963 |g Vol. 129, no. 31, p. 13923 - 13938 |0 PERI:(DE-600)2256522-X |n 31 |p 13923 - 13938 |t The journal of physical chemistry / C |v 129 |y 2025 |x 1932-7447 |
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