Liquid-Phase Acetylene Hydrogenation over Ag-Modified Pd/Sibunit Catalysts: Effect of Pd to Ag Molar Ratio
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Applied Catalysis A: General
ISSN: 0926-860X
, E-ISSN: 1873-3875
|
| Output data |
Year: 2020,
Volume: 600,
Article number
: 117627,
Pages count
: 9
DOI:
10.1016/j.apcata.2020.117627
|
| Tags |
Acetylene hydrogenation; Modification with Ag; Nanoparticles; Palladium catalyst; Structural changes |
| Authors |
Glyzdova Daria V.
1
,
Afonasenko Tatyana N.
1
,
Khramov Evgeny V.
2
,
Leont'eva Natalya N.
1
,
Prosvirin Igor P.
3
,
Bukhtiyarov Andrey V.
3
,
Shlyapin Dmitry A.
1
|
| Affiliations |
| 1 |
Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis, Neftezavodskaya St., 54, Omsk, 644040, Russian Federation
|
| 2 |
National Research Center “Kurchatov Institute”, Kurchatov Square, 1, Moscow, 123182, Russian Federation
|
| 3 |
Federal Research Center Boreskov Institute of Catalysis, 5 Lavrentiev Ave., Novosibirsk, 630090, Russian Federation
|
|
Funding (1)
|
1
|
Federal Agency for Scientific Organizations
|
V.46.2.5. (АААА-А17-117021450096-8)
|
A series of bimetallic Pd–Ag catalysts supported on the carbon material Sibunit was synthesized for selective liquid-phase acetylene hydrogenation. Using XRD and EXAFS it was shown that palladium and silver in the 0.5% Pd–Ag/Sibunit can form bimetallic PdxAg(1− x ) nanoparticles with the composition depending on the Pd:Ag ratio. The active component of Pd–Ag(1:0.25)/Sibunit, Pd–Ag(1:1)/Sibunit and Pd–Ag(1:4)/Sibunit is represented by the particles of Pd0.74Ag0.26, Pd0.60Ag0.40 and Pd0.41Ag0.59 nanoalloys, respectively. An increase of the quantity of silver decreases the catalyst activity. The XPS study revealed that this phenomenon is caused by a decrease in the surface concentration of palladium (geometrical effect) and an increase in the degree of palladium electronic modification with silver (electronic effect). The latter exerts a beneficial effect on the reaction selectivity: as the Pd:Ag molar ratio is raised to 1:2, selectivity to ethylene increases to 81% (X > 97%), which exceeds 2.7-fold the selectivity of Pd/Sibunit. © 2020 Elsevier B.V.