Abstract
Three-way catalysts with low content of Pd-Rh alloy particles used as active components were synthesized and studied. Monometallic and bimetallic mixed catalysts with corresponding precious metals loading were chosen as reference samples. The catalytic activity was tested in oxidation of carbon monoxide, hydrocarbons, and in nitrogen oxides reduction. The stability of the samples was estimated by prompt thermal aging in situ technique. Ethane hydrogenolysis testing reaction was used to determine the surface concentration of Pd and Rh, and to confirm the alloy formation. Photoluminescence and electron paramagnetic resonance spectroscopy were applied to clarify the possible reasons of deactivation and to elucidate the mechanism of stabilization. It was shown that Pd-Rh alloyed catalyst is characterized by comparable activity and enhanced stability. While the Pd and Rh particles of monometallic samples were found to interact with support at high temperatures resulting in sintering and bulk diffusion, the particles of alloy type kept their initial state of dispersion and catalytic activity.
| Original language | English |
|---|---|
| Pages (from-to) | 1008-1014 |
| Number of pages | 7 |
| Journal | Topics in Catalysis |
| Volume | 56 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Aug 2013 |
| Externally published | Yes |
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Keywords
- Deactivation
- Exhaust gases neutralization
- Rhodium-palladium alloy
- Stability
- Three-way catalysts
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Catalytic purification of exhaust gases over Pd-Rh alloy catalysts. / Vedyagin, Aleksey A.; Gavrilov, Mikhail S.; Volodin, Alexander M.; Stoyanovskii, Vladimir O.; Slavinskaya, Elena M.; Mishakov, Ilya V.; Shubin, Yuri V.
In: Topics in Catalysis, Vol. 56, No. 11, 08.2013, p. 1008-1014.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Catalytic purification of exhaust gases over Pd-Rh alloy catalysts
AU - Vedyagin, Aleksey A.
AU - Gavrilov, Mikhail S.
AU - Volodin, Alexander M.
AU - Stoyanovskii, Vladimir O.
AU - Slavinskaya, Elena M.
AU - Mishakov, Ilya V.
AU - Shubin, Yuri V.
PY - 2013/8
Y1 - 2013/8
N2 - Three-way catalysts with low content of Pd-Rh alloy particles used as active components were synthesized and studied. Monometallic and bimetallic mixed catalysts with corresponding precious metals loading were chosen as reference samples. The catalytic activity was tested in oxidation of carbon monoxide, hydrocarbons, and in nitrogen oxides reduction. The stability of the samples was estimated by prompt thermal aging in situ technique. Ethane hydrogenolysis testing reaction was used to determine the surface concentration of Pd and Rh, and to confirm the alloy formation. Photoluminescence and electron paramagnetic resonance spectroscopy were applied to clarify the possible reasons of deactivation and to elucidate the mechanism of stabilization. It was shown that Pd-Rh alloyed catalyst is characterized by comparable activity and enhanced stability. While the Pd and Rh particles of monometallic samples were found to interact with support at high temperatures resulting in sintering and bulk diffusion, the particles of alloy type kept their initial state of dispersion and catalytic activity.
AB - Three-way catalysts with low content of Pd-Rh alloy particles used as active components were synthesized and studied. Monometallic and bimetallic mixed catalysts with corresponding precious metals loading were chosen as reference samples. The catalytic activity was tested in oxidation of carbon monoxide, hydrocarbons, and in nitrogen oxides reduction. The stability of the samples was estimated by prompt thermal aging in situ technique. Ethane hydrogenolysis testing reaction was used to determine the surface concentration of Pd and Rh, and to confirm the alloy formation. Photoluminescence and electron paramagnetic resonance spectroscopy were applied to clarify the possible reasons of deactivation and to elucidate the mechanism of stabilization. It was shown that Pd-Rh alloyed catalyst is characterized by comparable activity and enhanced stability. While the Pd and Rh particles of monometallic samples were found to interact with support at high temperatures resulting in sintering and bulk diffusion, the particles of alloy type kept their initial state of dispersion and catalytic activity.
KW - Deactivation
KW - Exhaust gases neutralization
KW - Rhodium-palladium alloy
KW - Stability
KW - Three-way catalysts
UR - http://www.scopus.com/inward/record.url?scp=84880410178&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84880410178&partnerID=8YFLogxK
U2 - 10.1007/s11244-013-0064-8
DO - 10.1007/s11244-013-0064-8
M3 - Article
AN - SCOPUS:84880410178
VL - 56
SP - 1008
EP - 1014
JO - Topics in Catalysis
JF - Topics in Catalysis
SN - 1022-5528
IS - 11
ER -