TY - JOUR

T1 - Interaction of Pd and Rh with ZrCeYLaO2 support during thermal aging and its effect on the CO oxidation activity

AU - Vedyagin, Aleksey A.

AU - Alikin, Evgeny A.

AU - Kenzhin, Roman M.

AU - Tashlanov, Mikhail Yu

AU - Stoyanovskii, Vladimir O.

AU - Plyusnin, Pavel E.

AU - Shubin, Yury V.

AU - Mishakov, Ilya V.

N1 - The study was financially supported by the Ministry of Education and Science of the Russian Federation within the framework of subsidizing agreement of October 23, 2017 (No. 14.581.21.0028, unique agreement identifier RFMEFI58117X0028) of the Federal Target Program "Research and development in priority directions of the progress of the scientific and technological complex of Russia for the years 2014-2020. The authors are grateful to A. Gladky for the assistance in TPR experiments. Characterization of the samples was performed using the equipment of the Center of Collective Use "National Center of Catalysts Research".

PY - 2020/2/1

Y1 - 2020/2/1

N2 - A commercial ceria–zirconia composition modified with yttrium and lanthanum oxides was studied as a support for palladium- and rhodium-containing three-way catalysts. The most attention was paid to an interaction of the supported active metals with the support under high-temperature conditions. It was found that both the metals affect noticeably the porous structure of the support and the loading of metal plays a role in this process. Moreover, oxygen storage capacity of the oxide composition was also influenced by the supported metals. Hydrothermal aging of the metal-loaded samples has decreased the oxygen storage capacity values in more than 2 times. The thermal stability of the monometallic samples was compared with bimetallic Pd–Rh catalysts prepared using a “single-source precursor” approach. The experiments were performed under prompt thermal aging conditions. It was found that monometallic Pd-only samples and bimetallic Pd–Rh samples exhibit excellent stability, while monometallic Rh-only catalysts undergo deactivation being heated up to 800 °C due to diffusion of rhodium into the bulk of the support. All the samples were additionally characterized by a diffuse reflectance UV–vis spectroscopy and a testing reaction of ethane hydrogenolysis. According to the results obtained, the character of the metal-support interaction was found to be strongly affected by the catalyst’s composition. Application of the bimetallic Pd–Rh particles of alloyed type was shown to result in the preferable location of the active components on the support’s surface, thus facilitating high activity and stability of the catalyst.

AB - A commercial ceria–zirconia composition modified with yttrium and lanthanum oxides was studied as a support for palladium- and rhodium-containing three-way catalysts. The most attention was paid to an interaction of the supported active metals with the support under high-temperature conditions. It was found that both the metals affect noticeably the porous structure of the support and the loading of metal plays a role in this process. Moreover, oxygen storage capacity of the oxide composition was also influenced by the supported metals. Hydrothermal aging of the metal-loaded samples has decreased the oxygen storage capacity values in more than 2 times. The thermal stability of the monometallic samples was compared with bimetallic Pd–Rh catalysts prepared using a “single-source precursor” approach. The experiments were performed under prompt thermal aging conditions. It was found that monometallic Pd-only samples and bimetallic Pd–Rh samples exhibit excellent stability, while monometallic Rh-only catalysts undergo deactivation being heated up to 800 °C due to diffusion of rhodium into the bulk of the support. All the samples were additionally characterized by a diffuse reflectance UV–vis spectroscopy and a testing reaction of ethane hydrogenolysis. According to the results obtained, the character of the metal-support interaction was found to be strongly affected by the catalyst’s composition. Application of the bimetallic Pd–Rh particles of alloyed type was shown to result in the preferable location of the active components on the support’s surface, thus facilitating high activity and stability of the catalyst.

KW - Bimetallic Pd–Rh alloys

KW - Ceria–zirconia support

KW - Metal-support interaction

KW - Palladium

KW - Rhodium

KW - Thermal stability

KW - PALLADIUM

KW - CEO2-ZRO2-AL2O3 COMPOSITE

KW - CATALYTIC PERFORMANCES

KW - AUTOMOTIVE 3

KW - REDOX BEHAVIOR

KW - ALUMINA

KW - EXHAUST-GASES

KW - Bimetallic Pd-Rh alloys

KW - Ceria-zirconia support

KW - ZR MIXED OXIDES

KW - OPTICAL SPECTROSCOPY

KW - METAL

UR - http://www.scopus.com/inward/record.url?scp=85077262380&partnerID=8YFLogxK

U2 - 10.1007/s11144-019-01704-8

DO - 10.1007/s11144-019-01704-8

M3 - Article

AN - SCOPUS:85077262380

VL - 129

SP - 117

EP - 133

JO - Reaction Kinetics, Mechanisms and Catalysis

JF - Reaction Kinetics, Mechanisms and Catalysis

SN - 1878-5190

IS - 1

ER -