Effect of Metal Ratio in Alumina-Supported Pd-Rh Nanoalloys on Its Performance in Three Way Catalysis
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Journal of Alloys and Compounds
ISSN: 0925-8388
, E-ISSN: 1873-4669
|
| Output data |
Year: 2018,
Volume: 749,
Pages: 155-162
Pages count
: 8
DOI:
10.1016/j.jallcom.2018.03.250
|
| Tags |
Three-way catalysts; Metastable Pd-Rh alloy; Partly miscible metals; Metal ratio; Stability |
| Authors |
Vedyagin Aleksey A.
1,2
,
Stoyanovskii Vladimir O.
1
,
Plyusnin Pavel E.
3,4
,
Shubin Yury V.
3,4
,
Slavinskaya Elena M.
1
,
Mishakov Ilya V.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, SB RAS, Novosibirsk, 630090, Russia
|
| 2 |
National Research Tomsk Polytechnic University, Tomsk, 634050, Russia
|
| 3 |
Nikolaev Institute of Inorganic Chemistry, SB RAS, Novosibirsk, 630090, Russia
|
| 4 |
Novosibirsk State University, Novosibirsk, 630090, Russia
|
|
Funding (1)
|
1
|
Russian Science Foundation
|
16-13-10192
|
The bimetallic Pd-Rh three-way catalysts were prepared by an incipient wetness impregnation of γ-Al2O3 with a joint solution of [Pd(NH3)4](NO3)2 and Na3 [Rh(NO2)6]. The ratio of the metals was varied by changing the ratio of the salt-precursors. The samples with Pd:Rh ratio of 3:2, 7:3 and 4:1 were compared in simultaneous oxidation of carbon monoxide, propane, propylene, and reduction of nitrogen monoxide at a lambda factor of 1.003 and 0.95. Stability tests were performed in a prompt thermal aging regime (consecutive heating-cooling cycles with a final temperature of 320, 600 and 800 °C). The samples were characterized by UV–vis and luminescence spectroscopies, and by testing reaction of ethane hydrogenolysis. It was found that the sample with Pd:Rh ratio of 3:2 is characterized with strong palladium-rhodium interaction, which makes this catalyst more stable at high temperature if compare with other alloyed Pd-Rh samples. Moreover, the mechanism of the three-way catalytic process over Pd:Rh (3:2) sample differs from other cases and involves a larger contribution of reactions with nitrogen oxide.