Phase-Dependent Structure Sensitivity of Pt/TiO2 for CO Oxidation Reactions

Kim, Haneul; Kim, Kwang Hyun; Khivantsev, Konstantin; Kim, Joonwoo; Lee, Jaekyoung; Kwak, Ja Hun

doi:10.1021/acs.jpcc.5c01980

Phase-Dependent Structure Sensitivity of Pt/TiO₂ for CO Oxidation Reactions

Journal Article · Tue Jul 08 00:00:00 EDT 2025 · The Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/acs.jpcc.5c01980· OSTI ID:2586449

^[1]; Kim, Kwang Hyun ^[1]; ^[2]; Kim, Joonwoo ^[3]; Lee, Jaekyoung ^[4]; ^[1]

Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of); Institute for Basic Science (IBS), Ulsan (Korea, Republic of)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Research Institute of Industrial Science & Technology (RIST), Gwangyang (Korea, Republic of)
Pukyong National University, Busan (Korea, Republic of)

Here, in this study, we investigated the effect of the support (rutile vs anatase titania) and of the Pt size of Pt nanoparticles and supports (rutile vs anatase) in the CO oxidation reaction. The steady-state specific activity of Pt/Rutile gradually increases with Pt dispersion, while that of Pt/Anatase is invariant with respect to Pt dispersion and is lower than the activity of Pt/Rutile. Our kinetic studies demonstrated that the reaction order for CO based on steady state is positive for sub-nm Pt clusters stabilized on rutile titania and it gradually changes to zero for large Pt clusters (>1 nm), as known in agreement with other studies for for supported Pt catalysts. In contrast, Pt/Anatase catalysts always show zero order dependence irrespective of Pt the size of Pt nanoparticles. Scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS) and CO chemisorption results confirm that the notable sintering of sub-nm Pt clusters supported on anatase occurs with time-on-stream, which we correlate with might be related with the change of the CO reaction order from positive (order initially) tobut zero order for larger particles after sintered states. On the contrary, Pt/Rutile does not show serious sintering during the reaction, and it shows positive reaction order even during the steady state. Thus Pt/Rutile shows positive order at steady state and higher specific activity. Our study reveals the origin of profound catalytic differences between Pt nanoparticles supported on anatase and rutile titania and highlights better stability and activity of Pt/Rutile catalysts. than Pt/Anatase due to its better stability.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: Institute for Basic Science (IBS); National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2586449

Report Number(s):: PNNL-SA--213279

Journal Information:: The Journal of Physical Chemistry C, Journal Name: The Journal of Physical Chemistry C Journal Issue: 28 Vol. 129; ISSN 1932-7455; ISSN 1932-7447

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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