TY - JOUR

T1 - Preparation of Model Rh–CeO2 Catalysts by Pulsed Laser Ablation in Liquid

AU - Kibis, L. S.

AU - Krotova, A. I.

AU - Fedorova, E. A.

AU - Kardash, T. Yu

AU - Stonkus, O. A.

AU - Svetlichnyi, V. A.

AU - Slavinskaya, E. M.

AU - Boronin, A. I.

N1 - This work was funded by the Ministry of Science and Higher Education of the Russian Federation within the State Assignment for BIC SB RAS (project No. AAAA-A21-121011390053-4). The TEM study was conducted using the equipment of the Center of Collective Use “National Center of Catalyst Research”. Публикация для корректировки.

PY - 2023/11

Y1 - 2023/11

N2 - The powders of Rh and CeO2 are synthesized by pulsed laser ablation in liquid. The Rh–CeO2 model catalysts are prepared by the calcination of these powders in a wide temperature range from 450 °C to 1000 °C. The formation of individual and mixed (rhodium- and cerium-containing) phases with increasing temperature of catalyst calcination is studied by powder XRD and Raman spectroscopy. The redox properties of prepared catalysts are tested in a temperature-programmed reaction of CO reduction; their catalytic properties are studied on the example of CO oxidation. It is shown that the catalysts remain stable during catalytic tests due to the formation of a nano-heterophase system consisting of rhodium oxide (Rh2O3) and cerium oxide (CeO2) nanoparticles. The discovered high stability is most likely explained by the formation of the Rh3+–CeO2 species with the localization of Rh3+ ions in subsurface CeO2 layers due to the contacts between rhodium oxide and cerium oxide nanoparticles. Introducing Rh3+ ions into Ce4+ positions of the CeO2 lattice distorts the cerium oxide structure and leads to the formation of active oxygen species interacting with CO at low temperatures. The catalysts are shown to preserve high activity in the reaction of low-temperature CO oxidation even after the calcination at 1000 °C.

AB - The powders of Rh and CeO2 are synthesized by pulsed laser ablation in liquid. The Rh–CeO2 model catalysts are prepared by the calcination of these powders in a wide temperature range from 450 °C to 1000 °C. The formation of individual and mixed (rhodium- and cerium-containing) phases with increasing temperature of catalyst calcination is studied by powder XRD and Raman spectroscopy. The redox properties of prepared catalysts are tested in a temperature-programmed reaction of CO reduction; their catalytic properties are studied on the example of CO oxidation. It is shown that the catalysts remain stable during catalytic tests due to the formation of a nano-heterophase system consisting of rhodium oxide (Rh2O3) and cerium oxide (CeO2) nanoparticles. The discovered high stability is most likely explained by the formation of the Rh3+–CeO2 species with the localization of Rh3+ ions in subsurface CeO2 layers due to the contacts between rhodium oxide and cerium oxide nanoparticles. Introducing Rh3+ ions into Ce4+ positions of the CeO2 lattice distorts the cerium oxide structure and leads to the formation of active oxygen species interacting with CO at low temperatures. The catalysts are shown to preserve high activity in the reaction of low-temperature CO oxidation even after the calcination at 1000 °C.

KW - cerium oxide

KW - low-temperature CO oxidation

KW - nanoparticles

KW - pulsed laser ablation

KW - rhodium oxide

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85178250319&origin=inward&txGid=4f01b1899e0f454b584612f020203c3e

UR - https://www.mendeley.com/catalogue/9d5ec865-60ba-337b-8276-63f8caf0e322/

U2 - 10.1134/S0022476623110161

DO - 10.1134/S0022476623110161

M3 - Article

VL - 64

SP - 2187

EP - 2199

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 11

ER -