Abstract
The present work is devoted to the study of doping effects of zinc, gallium and silver on the structure of active sites and catalytic properties of carbon-supported 0.5 wt% Pd catalysts in the liquid-phase selective hydrogenation of acetylene to ethylene. Carbonaceous graphite-like material Sibunit was used as a support. The reaction was performed in a medium of N-methyl-2-pyrrolidone at 55 °C. It was shown that the bimetallic Pd-Zn/C, Pd-Ga/C and Pd-Ag/C catalysts exhibit better activity and selectivity towards target product if compare with the monometallic Pd/C catalyst. The ethylene yield increases in a row as follows: Pd/C (19%) < Pd-Ag/C (34%) < Pd-Ga/C (42%) < Pd-Zn/C (53%). Using X-ray absorption spectroscopy and transmission electron microscopy it was found that an improvement of the selectivity is stipulated by the formation of bimetallic PdZn, PdxGay and PdAg nanophases. In the case of Pd-Zn/C and Pd-Ag/C systems, an increased distance between neighboring Pd atoms (2.82–2.89 Å) in relation with monometallic Pd/C, where this distance is 2.72 Å, was observed. The higher activity of modified bimetallic systems is connected with increased number of active sites due to enhanced dispersity of supported palladium doped with second metal.
| Language | English |
|---|---|
| Pages | 18-27 |
| Number of pages | 10 |
| Journal | Applied Catalysis A: General |
| Volume | 563 |
| DOIs | |
| Publication status | Published - 5 Aug 2018 |
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Keywords
- Bimetallic catalysts
- Carbonaceous support
- Liquid-phase hydrogenation of acetylene
- Metal-metal interaction
- Palladium catalyst
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology
Cite this
A study on structural features of bimetallic Pd-M/C (M : Zn, Ga, Ag) catalysts for liquid-phase selective hydrogenation of acetylene. / Glyzdova, Daria V.; Vedyagin, Aleksey A.; Tsapina, Anna M.; Kaichev, Vasily V.; Trigub, Alexander L.; Trenikhin, Mikhail V.; Shlyapin, Dmitry A.; Tsyrulnikov, Pavel G.; Lavrenov, Alexander V.
In: Applied Catalysis A: General, Vol. 563, 05.08.2018, p. 18-27.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A study on structural features of bimetallic Pd-M/C (M
T2 - Applied Catalysis A: General
AU - Glyzdova, Daria V.
AU - Vedyagin, Aleksey A.
AU - Tsapina, Anna M.
AU - Kaichev, Vasily V.
AU - Trigub, Alexander L.
AU - Trenikhin, Mikhail V.
AU - Shlyapin, Dmitry A.
AU - Tsyrulnikov, Pavel G.
AU - Lavrenov, Alexander V.
PY - 2018/8/5
Y1 - 2018/8/5
N2 - The present work is devoted to the study of doping effects of zinc, gallium and silver on the structure of active sites and catalytic properties of carbon-supported 0.5 wt% Pd catalysts in the liquid-phase selective hydrogenation of acetylene to ethylene. Carbonaceous graphite-like material Sibunit was used as a support. The reaction was performed in a medium of N-methyl-2-pyrrolidone at 55 °C. It was shown that the bimetallic Pd-Zn/C, Pd-Ga/C and Pd-Ag/C catalysts exhibit better activity and selectivity towards target product if compare with the monometallic Pd/C catalyst. The ethylene yield increases in a row as follows: Pd/C (19%) < Pd-Ag/C (34%) < Pd-Ga/C (42%) < Pd-Zn/C (53%). Using X-ray absorption spectroscopy and transmission electron microscopy it was found that an improvement of the selectivity is stipulated by the formation of bimetallic PdZn, PdxGay and PdAg nanophases. In the case of Pd-Zn/C and Pd-Ag/C systems, an increased distance between neighboring Pd atoms (2.82–2.89 Å) in relation with monometallic Pd/C, where this distance is 2.72 Å, was observed. The higher activity of modified bimetallic systems is connected with increased number of active sites due to enhanced dispersity of supported palladium doped with second metal.
AB - The present work is devoted to the study of doping effects of zinc, gallium and silver on the structure of active sites and catalytic properties of carbon-supported 0.5 wt% Pd catalysts in the liquid-phase selective hydrogenation of acetylene to ethylene. Carbonaceous graphite-like material Sibunit was used as a support. The reaction was performed in a medium of N-methyl-2-pyrrolidone at 55 °C. It was shown that the bimetallic Pd-Zn/C, Pd-Ga/C and Pd-Ag/C catalysts exhibit better activity and selectivity towards target product if compare with the monometallic Pd/C catalyst. The ethylene yield increases in a row as follows: Pd/C (19%) < Pd-Ag/C (34%) < Pd-Ga/C (42%) < Pd-Zn/C (53%). Using X-ray absorption spectroscopy and transmission electron microscopy it was found that an improvement of the selectivity is stipulated by the formation of bimetallic PdZn, PdxGay and PdAg nanophases. In the case of Pd-Zn/C and Pd-Ag/C systems, an increased distance between neighboring Pd atoms (2.82–2.89 Å) in relation with monometallic Pd/C, where this distance is 2.72 Å, was observed. The higher activity of modified bimetallic systems is connected with increased number of active sites due to enhanced dispersity of supported palladium doped with second metal.
KW - Bimetallic catalysts
KW - Carbonaceous support
KW - Liquid-phase hydrogenation of acetylene
KW - Metal-metal interaction
KW - Palladium catalyst
UR - http://www.scopus.com/inward/record.url?scp=85049077516&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85049077516&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2018.06.029
DO - 10.1016/j.apcata.2018.06.029
M3 - Article
VL - 563
SP - 18
EP - 27
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -