Interaction of Pd and Rh with ZrCeYLaO2 Support During Thermal Aging and Its Effect on the CO Oxidation Activity
Научная публикация
| Общее |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Reaction Kinetics, Mechanisms and Catalysis
ISSN: 1878-5190
, E-ISSN: 1878-5204
|
| Вых. Данные |
Год: 2020,
Том: 129,
Номер: 1,
Страницы: 117-133
Страниц
: 17
DOI:
10.1007/s11144-019-01704-8
|
| Ключевые слова |
Palladium; rhodium; ceria-zirconia support; metal-support interaction; thermal stability; bimetallic Pd-Rh alloys |
| Авторы |
Vedyagin Aleksey A.
1
,
Alikin Evgeny A.
2
,
Kenzhin Roman M.
1
,
Tashlanov Mikhail Yu.
2,3
,
Stoyanovskii Vladimir O.
1
,
Plyusnin Pavel E.
3,4
,
Shubin Yury V.
3,4
,
Mishakov Ilya V.
1,3
|
| Организации |
| 1 |
Boreskov Institute of Catalysis SB RAS, Novosibirsk
|
| 2 |
Ecoaliiance LLC
|
| 3 |
National Research Novosibirsk State University
|
| 4 |
Nikolaev Institute of Inorganic Chemistry SB RAS
|
|
Информация о финансировании (1)
|
1
|
Министерство образования и науки Российской Федерации
|
14.581.21.0028 (RFMEFI58117X0028)
|
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.