Effect of La Addition on the Performance of Three-Way Catalysts Containing Palladium and Rhodium
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Conference |
XI International Conference Mechanisms of Catalytic Reactions
07-11 Oct 2019
,
Сочи
|
| Journal |
Topics in Catalysis
ISSN: 1022-5528
, E-ISSN: 1572-9028
|
| Output data |
Year: 2020,
Volume: 63,
Number: 1-2,
Pages: 152–165
Pages count
: 14
DOI:
10.1007/s11244-019-01213-x
|
| Tags |
Three-way catalysts; bimetallic Pd-Rh alloys; La-doped alumina support; metal-support interaction; thermal stability |
| Authors |
Vedyagin Aleksey A.
1
,
Kenzhin Roman M.
1
,
Tashlanov Mikhail Yu.
1,2
,
Alikin Evgeny A.
3
,
Stoyanovskii Vladimir O.
1
,
Plyusnin Pavel E.
2,4
,
Shubin Yury V.
2,4
,
Mishakov Ilya V.
1,2
,
Smirnov Mikhail Yu.
1
,
Kalinkin Alexander V.
1
,
Bukhtiyarov Valerii I.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
| 2 |
National Research Novosibirsk State University
|
| 3 |
Ecoalliance LLC, Novouralsk
|
| 4 |
Nikolaev Institute of Inorganic Chemistry SB RAS
|
|
Funding (1)
|
1
|
The Ministry of Education and Science of the Russian Federation
|
14.581.21.0028 (RFMEFI58117X0028)
|
Three-way catalysts containing palladium and/or rhodium were prepared using γAl2O3 doped with lanthanum oxide as a support. All the samples were obtained by an incipient wetness impregnation of the support with an aqueous solution of nitrates. In order to investigate the metal-support interaction, the support was additionally calcined at 800 °C before the impregnation procedure. Characterization of the support thermally treated within a range of 600-1000 °C by low-temperature nitrogen absorption, X-ray diffraction analysis, and electron paramagnetic resonance spectroscopy has revealed that the treatment conditions strongly affect the textural properties, the phase composition and the concentration of electron-donor sites on the surface of the support. Deposition of metals by the impregnation of initial support with a joint solution of Pd and Rh nitrates has led to formation of small Pd-Rh alloyed nanoparticles with strong metal-metal interaction, which was confirmed by a testing reaction of ethane hydrogenolysis. No alloy formation was observed in the case of mechanical mixing of the separately prepared Pd-only and Rh-only catalysts as well as in the case of preliminary calcined support impregnated with joint solution of Pd and Rh nitrates. Bimetallic Pd-Rh catalyst of alloyed type was shown to be the most promising in terms of catalytic performance and thermal stability.